{"id":942,"date":"2018-05-16T15:05:01","date_gmt":"2018-05-16T07:05:01","guid":{"rendered":"http:\/\/weizn.net\/?p=942"},"modified":"2021-09-16T20:54:27","modified_gmt":"2021-09-16T12:54:27","slug":"suricata%e8%a7%84%e5%88%99%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96%e5%bb%ba%e8%ae%ae","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=942","title":{"rendered":"Suricata\u89c4\u5219\u6027\u80fd\u8bc4\u4f30\u4ee5\u53ca\u4f18\u5316\u5efa\u8bae"},"content":{"rendered":"

\u8bc4\u4f30\u89c4\u5219\u6027\u80fd<\/strong><\/p>\n

\u5f00\u542fprofiling-rules\u529f\u80fd\uff1a<\/p>\n

\"768c9432f8fb26b01f9ef07502192502\"<\/p>\n

\u67e5\u770b\u8bc4\u4f30\u65e5\u5fd7\uff1a<\/p>\n

\"20495bb78a4d2b7b4880cf4f4c584399\"<\/p>\n

\u6709\u95ee\u9898\u7684\u89c4\u5219\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u4f18\u5316\u3002<\/p>\n

 <\/p>\n

\u51cf\u5c11\u62a5\u6587\u5339\u914d\u7684\u5185\u5bb9<\/strong>
\n\u5f53\u4e00\u4e2a\u62a5\u6587\u5230\u8fbe\u4e4b\u540e\uff0c\u9700\u8981\u5339\u914d\u54ea\u4e9b\u5b57\u6bb5\u7684\u5185\u5bb9\u662f\u7531\u89c4\u5219\u51b3\u5b9a\u7684\u3002\u603b\u7684\u76ee\u6807\u662f\uff0c\u51cf\u5c11\u65e0\u7528\u7684\u5339\u914d\u3002
\n1\uff0c\u9488\u5bf9TCP\u7684\u6d41\u91cf\uff0c\u5982\u679c\u80fd\u591f\u52a0\u4e0aoffset,distance,within,depth\u7b49\u5173\u952e\u5b57\uff0c\u7f29\u5c0f\u9700\u8981\u5339\u914d\u7684\u62a5\u6587\u957f\u5ea6\uff0c\u80fd\u591f\u6709\u6548\u7684\u51cf\u5c11\u5339\u914d\u7684\u8017\u65f6\u3002\u901a\u5e38\u521d\u5b66\u8005\u6765\u8bf4\u76f4\u63a5\u4f7f\u7528content\u662f\u80fd\u591f\u6ee1\u8db3\u529f\u80fd\u9700\u6c42\uff0c\u4f46\u662f\u5bf9\u4e8e\u6027\u80fd\u7684\u5f71\u54cd\u5e76\u6ca1\u6709\u8003\u91cf\u3002<\/p>\n

2\uff0c\u9488\u5bf9\u4e00\u4e2aHTTP\u7684\u5a01\u80c1\u6d41\u91cf\uff0c\u5982\u679c\u76f4\u63a5\u4f7f\u7528content\u5339\u914d\u800c\u4e0d\u52a0\u5165\u4efb\u4f55\u7684\u4fee\u9970\u7b26\u7684\u8bdd\uff0c\u5c06\u4f1a\u76f4\u63a5\u4ece\u4f20\u8f93\u5c42\u7684\u4e0a\u5c42\u8fdb\u884c\u5339\u914d\u3002\u5b57\u7b26\u4e32\u7684\u5339\u914d\u867d\u7136\u6709ac\u4ee5\u53cahs\u7b49\u9ad8\u6548\u7684\u5339\u914d\u65b9\u6cd5\uff0c\u4f46\u662f\u9762\u5bf9\u975e\u5e38\u957f\u7684\u4f9d\u7136\u975e\u5e38\u7684\u8017\u65f6\u3002\u76f8\u53cd\u597d\u7684\u89c4\u5219\u5199\u6cd5\u662f\u5229\u7528suricata\u63d0\u4f9b\u7684http\u5173\u952e\u5b57\uff0c\u53bb\u5339\u914d\u5bf9\u5e94\u7684\u5185\u5bb9\uff0c\u4f8b\u5982http_uri,http_method,http_cookie\u7b49\u7b49\u3002\u8fd9\u6837\u5229\u7528\u89e3\u7801\u51fa\u6765\u7684http buffer\u4e2d\u7684\u5185\u5bb9\uff0c\u80fd\u591f\u6781\u5927\u7684\u51cf\u5c11\u65e0\u6548\u5185\u5bb9\u7684\u5339\u914d\uff0c\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n

\u51cf\u5c11\u62a5\u6587\u5339\u914d\u7684\u6b21\u6570<\/strong>
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\n2\uff0csuricata\u7684prefilter\u673a\u5236\uff0c\u5148\u5339\u914d\u89c4\u5219\u4e2d\u7684\u4e00\u4e2a\u6761\u4ef6\uff0c\u5c06\u6761\u4ef6\u547d\u4e2d\u7684\u89c4\u5219\u7b5b\u9009\u51fa\u6765\u8fdb\u5165\u540e\u7eed\u7684\u5168\u90e8\u6761\u4ef6\u7684\u5339\u914d\u3002\u8fd9\u6837\u80fd\u591f\u5c06\u4e0d\u5fc5\u8981\u7684\u89c4\u5219\u63d0\u524d\u5254\u9664\u3002\u5173\u4e8eprefilter\u6211\u5728\u524d\u9762\u7684\u6587\u7ae0\u4e2d\u6709\u5355\u72ec\u7684\u5206\u6790\u3002
\n3\uff0csuricata\u63d0\u4f9b\u4e86\u5927\u91cf\u7684\u5173\u952e\u5b57\u7528\u4ee5\u7f16\u5199\u68c0\u6d4b\u89c4\u5219\uff0c\u4e0d\u540c\u5173\u952e\u5b57\u7684\u7ec4\u5408\u5b9e\u5bf9\u4e8e\u68c0\u6d4b\u5f15\u64ce\u7684\u68c0\u6d4b\u6548\u7387\u662f\u7531\u5f71\u54cd\u7684\u3002\u56e0\u4e3a\u4e0d\u540c\u7684\u5173\u952e\u5b57\u610f\u5473\u7740\u4e0d\u540c\u7684\u68c0\u6d4b\u6d41\u7a0b\uff0c\u4e0d\u540c\u68c0\u6d4b\u6d41\u7a0b\u7684\u7ec4\u5408\u6548\u7387\u80af\u5b9a\u6709\u9ad8\u4f4e\u4e4b\u5206\uff0c\u4ece\u8fd9\u4e2a\u89d2\u5ea6\u6765\u8bf4\u6709\u7684\u89c4\u5219\u5199\u7684\u6bd4\u8f83\u597d\uff0c\u6709\u7684\u89c4\u5219\u5199\u7684\u5c31\u4e0d\u592a\u597d\u3002<\/p>\n

\u90a3\u4e48\u4ec0\u4e48\u6837\u7684\u89c4\u5219\u662f\u597d\u7684\u89c4\u5219\uff1f\u4ec0\u4e48\u6837\u7684\u89c4\u5219\u662f\u4e0d\u597d\u7684\u89c4\u5219\u5462\uff1f\u7531\u4e8e\u5b9e\u9645\u7684\u4e1a\u52a1\u573a\u666f\u4e0d\u540c\uff0c\u89c4\u5219\u96c6\u7684\u6570\u91cf\uff0c\u4ee5\u53ca\u9700\u8981\u9001\u5f15\u64ce\u7684\u62a5\u6587\u6570\u91cf\u53ef\u80fd\u9700\u8981\u5206\u5c40\u5b9e\u9645\u7684\u4e1a\u52a1\u573a\u666f\u6765\u5b9a\u3002\u4f46\u662f\u4e00\u4e2a\u89c4\u5219\u7684\u597d\u574f,suricata\u662f\u7ed9\u51fa\u4e86\u5177\u4f53\u7684\u8bc4\u4ef7\u6807\u51c6\u3002\u6839\u636esuricata\u63d0\u4f9b\u7684\u89c4\u5219\u4f18\u5316\u8bc4\u4ef7\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6307\u5bfc\u6211\u4eec\u5982\u4f55\u5199\u51fa\u66f4\u52a0\u597d\u7684\u89c4\u5219\u3002<\/p>\n

\u6700\u540e\uff0c\u672c\u8eabsuricata\u5185\u90e8\u7684\u8bc6\u522b\u673a\u5236\u51b3\u5b9a\u4e86\u597d\u7684\u89c4\u5219\u6d41\u7a0b\u53ea\u9700\u8981\u8d70\u4e00\u904d\uff0c\u800c\u4e0d\u597d\u89c4\u5219\u5219\u9700\u8981\u8d70\u4e24\u8fb9\u3002
\n\u9996\u5148suricata\u7684\u6027\u80fd\u4e0e\u89c4\u5219\u96c6\u7684\u89c4\u6a21\u662f\u5b58\u5728\u975e\u5e38\u76f4\u63a5\u7684\u5173\u7cfb\u3002\u901a\u5e38\u6765\u8bf4\u89c4\u5219\u96c6\u7684\u89c4\u6a21\u8d8a\u5927\uff0csuricata\u5904\u7406\u7684\u6027\u80fd\u8d8a\u4f4e\u3002\u5728\u89c4\u5219\u5339\u914d\u9636\u6bb5\uff0c\u4e3b\u8981\u6d88\u8017\u6027\u80fd\u7684\u662f\u5b57\u7b26\u4e32\u7684\u5339\u914d\u3002\u800c\u5b57\u7b26\u4e32\u7684\u5339\u914d\u5206\u4e3a\u5355\u6a21\u7684\u5339\u914d\u4ee5\u53ca\u591a\u6a21\u7684\u5339\u914d\u3002\u591a\u6a21\u7684\u5339\u914d\u4e3b\u8981\u662fPrefilter\u51fd\u6570\u4e2d \u6bcf\u6761\u89c4\u5219\u7684fast pattern\u5b57\u7b26\u4e32\u6784\u6210\u7684\u6a21\u5f0f\u96c6\u5408\u53bb\u5339\u914d\u62a5\u6587\uff0c\u591a\u6570\u60c5\u51b5\u4e0b\u662f\u5339\u914dpayload\u90e8\u5206\u7684\u5185\u5bb9\u3002\u800c\u5355\u6a21\u7684\u5339\u914d\u4e3b\u8981\u662fDetectRulePacketRules\u51fd\u6570\u4e2d\uff0c\u6bcf\u6761\u88abprefilter\u547d\u4e2d\u7684\u89c4\u5219\uff0c\u89c4\u5219\u4e2d\u7684\u6bcf\u4e00\u4e2a\u6761\u4ef6\u4f9d\u6b21\u53bb\u5339\u914d\u62a5\u6587\u3002\u7531\u4e8e\u7ecf\u8fc7prefilter\u4e4b\u540e\uff0c\u8fc7\u6ee4\u51fa\u6765\u7684\u89c4\u5219\u5df2\u7ecf\u5927\u5927\u7684\u51cf\u5c11\uff0c\u56e0\u6b64\u5355\u6a21\u5339\u914d\u6d88\u8017\u7684\u6027\u80fd\u5e76\u4e0d\u662f\u5341\u5206\u7684\u7a81\u51fa\u3002\u6027\u80fd\u7684\u6d88\u8017\u4e3b\u8981\u96c6\u4e2d\u5728prefilter\u7684\u591a\u6a21\u5339\u914d\u90e8\u5206\u3002\u662f\u60f3\u4e00\u4e0b\u4e00\u4e2a\u51e0\u4e07\u6761\u5de6\u53f3\u7684\u89c4\u5219\u96c6\uff0c\u4e5f\u5c06\u4f1a\u62e5\u6709\u5f88\u5e9e\u5927\u7684\u591a\u6a21\u6a21\u5f0f\u96c6\uff0c\u6bcf\u4e2a\u62a5\u6587\u90fd\u8981\u53bb\u5339\u914d\uff0c\u8fd8\u662f\u975e\u5e38\u7684\u8017\u6027\u80fd\u3002\u56e0\u6b64\u53bb\u9664\u5e76\u4e0d\u5fc5\u8981\u7684\u89c4\u5219\uff0c\u662f\u89c4\u5219\u4f18\u5316\u7684\u7b2c\u4e00\u6b65\u3002<\/p>\n

\u6309\u7167\u4e4b\u524d\u7684\u7406\u89e3\uff0c\u80af\u5b9a\u662f\u5339\u914d\u6b21\u6570\u5c11\u7684\u89c4\u5219\u662f\u597d\u7684\u89c4\u5219\u3002\u7eafIP\u89c4\u5219\u4ee5\u53ca\u7eaf\u534f\u8bae\u68c0\u6d4b\u7684\u89c4\u5219\u53ef\u4ee5\u80fd\u6bd4\u4e4b\u4e8e\u5b57\u7b26\u4e32\u5339\u914d\u89c4\u5219\u6027\u80fd\u9ad8\u3002\u5173\u4e8e\u89c4\u5219\u7684\u4f18\u52a3suricata\u4e5f\u662f\u6839\u636e\u5185\u90e8\u5bf9\u4e8e\u5173\u952e\u5b57\u7684\u5904\u7406\u6d41\u7a0b\uff0c\u7ed9\u51fa\u4e86\u5bf9\u4e8e\u89c4\u5219\u7684\u610f\u89c1\u5206\u6790\u5efa\u8bae\uff0c\u4e3b\u8981\u662fEngineAnalysisFP\u548cEngineAnalysisRules\u51fd\u6570\u3002EngineAnalysisFP\u4e3b\u8981\u662f\u9488\u5bf9fast pattern\u7684\u5206\u6790\uff0cEngineAnalysisRules\u9488\u5bf9\u7684\u662f\u6574\u4e2a\u89c4\u5219\u7684\u5206\u6790\u3002<\/p>\n

if (RunmodeGetCurrent() == RUNMODE_ENGINE_ANALYSIS) {
\nfp_engine_analysis_set = SetupFPAnalyzer();
\nrule_engine_analysis_set = SetupRuleAnalyzer();
\n}
\n\u6bd4\u8f83\u5f71\u54cd\u6027\u80fd\u7684\u89c4\u5219\uff1a<\/strong>
\n1\uff0c\u7531\u4e8ePCRE\u5173\u952e\u5b57\u5bf9\u4e8e\u6027\u80fd\u7684\u6d88\u8017\u6bd4\u8f83\u5927\uff0c\u4e3a\u4e86\u907f\u514d\u9891\u7e41\u7684PCRE\u5339\u914d\u3002PCRE\u901a\u5e38\u548cCONTENT\u5173\u952e\u5b57\u540c\u65f6\u4f7f\u7528\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f1a\u5148\u5339\u914dcontent\u5173\u952e\u5b57\uff0c\u5339\u914d\u6210\u529f\u4e4b\u540e
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2\uff0c\u5982\u679ccontent\u4f7f\u7528\u4e86http\u7b49buffer\u7684\u4fee\u9970\u7b26\uff0c\u89c4\u5219\u4e2d\u5171\u540c\u65f6\u5b58\u5728PCRE\u7684\u65f6\u5019\uff0c\u540c\u6837\u5efa\u8baePCRE\u4f7f\u7528\u8fd9\u6837\u7684http buffer\u4fee\u9970\u7b26\u3002\u4f7f\u7528\u4fee\u9970\u7b26\u7684\u76ee\u7684\u5c31\u662f\u51cf\u5c11\u5339\u914d\uff0c\u6ca1\u6709\u4fee\u9970\u7b26\u5219\u4f1a\u53bb\u5339\u914dpayload\u90e8\u5206\u7684\u5185\u5bb9\u3002<\/p>\n

3\uff0c\u5982\u679c\u89c4\u5219\u5934\u90e8\u7684\u534f\u8bae\u662fHTTP\uff0c\u5219\u6240\u6709\u7684contentcontent\u4ee5\u53caPCRE\u540c\u6837\u5e94\u8be5\u4f7f\u7528HTTP buffer\u7684\u4fee\u9970\u7b26\u8fdb\u884c\u4fee\u9970\u3002<\/p>\n

4\uff0c\u5982\u679c\u4e00\u4e2a\u89c4\u5219\u4e2d\u4f7f\u7528\u4e86http buffer \u4fee\u9970\u7b26\u4fee\u9970\u4e86content,\u5219\u6240\u6709\u7684content \u90fd\u5e94\u8be5\u4f7f\u7528http buffer\u4fee\u9970\u7b26\u4fee\u9970\uff0c\u8fd9\u6837\u80fd\u591f\u660e\u663e\u7684\u51cf\u5c11\u5185\u5bb9\u7684\u5339\u914d\u3002
\n5\uff0c\u5982\u679c\u534f\u8bae\u5934\u90e8\u660e\u786e\u4e86\u662fTCP\u534f\u8bae\u89c4\u5219\uff0c\u5efa\u8bae\u52a0\u4e0aflow \u6216\u8005 flags \u7b49\u5173\u952e\u5b57\u63d0\u9ad8\u6027\u80fd
\n6\uff0c\u5982\u679c\u89c4\u5219\u5934\u90e8\u6307\u793a\u89c4\u5219\u662f\u53cc\u5411\u7684\uff0c\u4f46\u662fflow\u5173\u952e\u5b57\u6307\u793a\u89c4\u5219\u662f\u5355\u5411\u7684\uff0c\u5219\u4e0d\u662f\u4e00\u4e2a\u597d\u89c4\u5219\u3002
\n7\uff0c\u5982\u679c\u89c4\u5219\u4ec5\u4ec5\u9488\u5bf9\u4e8e\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\uff0c\u53ef\u80fd\u9700\u8981\u8003\u8651\u662f\u5426\u5408\u7406\u3002\u56e0\u4e3a\u5ba2\u6237\u7aef\u7684\u7aef\u53e3\u901a\u5e38\u6765\u8bf4\u90fd\u662f\u968f\u673a\u7684\uff0c\u670d\u52a1\u5668\u7684\u7aef\u53e3\u4e00\u822c\u662f\u6709\u7279\u5b9a\u542b\u4e49\u7684\u3002
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