{"id":31175,"date":"2022-11-28T21:30:58","date_gmt":"2022-12-07T05:26:16","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e7%9a%84xxe\/"},"modified":"2025-08-12T22:41:36","modified_gmt":"2025-08-12T14:41:36","slug":"%e4%bd%bf%e7%94%a8java%e7%9a%84xxe","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java%e7%9a%84xxe\/","title":{"rendered":"\u4f7f\u7528Java\u7684XXE"},"content":{"rendered":"

XXE\u548cJava<\/p>\n

XXE\u662f\u4ec0\u4e48\u6307\u7684\u662f\u4ec0\u4e48\uff1fXXE\uff08XML\u5916\u90e8\u5b9e\u4f53\uff09\u662f\u5229\u7528XML\u7684\u5916\u90e8\u5f15\u7528\u529f\u80fd\u6765\u83b7\u53d6\uff08\u6cc4\u9732\uff09\u670d\u52a1\u5668\u5185\u90e8\u6587\u4ef6\u5185\u5bb9\uff0c\u6216\u8005\u8bbf\u95ee\u5185\u90e8\u7f51\u7edc\u4e2d\u7684\u6587\u4ef6\u8fdb\u884c\u975e\u6cd5\u884c\u4e3a\u7684\u3002<\/p>\n

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Java \u548c XML\u8981\u5728Java\u4e2d\u5904\u7406XML\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528javax.xml.parsers.DocumentBuilder\u3002<\/p>\n

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\u7d50\u679c\u5728XXE\u57fa\u672c\u7de8\u7684\u94fe\u63a5\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7JavaVM\u7684\u5c5e\u6027\u6765\u63a7\u5236\uff0c\u56e0\u6b64\u53ef\u4ee5\u9009\u62e9\u5feb\u6377\u7684\u65b9\u5f0f\u3002\u4f46\u53e6\u4e00\u65b9\u9762\uff0c\u4f5c\u4e3aJava\u7a0b\u5e8f\u5458\uff0c\u81ea\u5df1\u7f16\u5199\u89e3\u6790\u5668\u5e76\u8fdb\u884c\u63a7\u5236\u4e5f\u5e94\u8be5\u4e0d\u662f\u5f88\u56f0\u96be\u3002<\/p>\n

\u4f7f\u7528Java\u89e6\u53d1XXE\u6f0f\u6d1e\u8bf7\u5c1d\u8bd5\u4f7f\u7528\u4ee5\u4e0b\u7684\u7b54\u6848\uff1a<\/p>\n

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\u5c31\u662f\u8fd9\u6837\u7684\u611f\u89c9\u3002<\/p>\n

\"xxe-java-defo.png\"\u5728Java\u7684\u60c5\u51b5\u4e0b\uff0c\u901a\u5e38\u4f1a\u53d7\u5230XXE\u653b\u51fb\u3002<\/p>\n

\u5c06\u5916\u90e8\u53c2\u8003\u5bf9\u8c61\u8bbe\u7f6e\u4e3aNULL\u4e0b\u9762\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528javax.xml.parsers.DocumentBuilder\uff03setEntityResolver\uff08\uff09\u65b9\u6cd5\u5e76\u4f20\u5165\u201cNULL\u201d\u3002<\/p>\n

\u5dee\u4e0d\u591a\u8fd9\u6837\u7684\u611f\u89c9\u3002<\/p>\n

\"xxe-java-null.png\"\u4e0e.NET Framework\u4e0d\u540c\uff0cJava\u4e2d\u7684Null\u88ab\u89c6\u4e3a\u9ed8\u8ba4\u7684\u89e3\u6790\u5668\u5bf9\u8c61\uff0c\u56e0\u6b64\u5373\u4f7f\u662fNULL\uff0c\u5728Java\u7684\u60c5\u51b5\u4e0b\u4e5f\u53ef\u80fd\u53d7\u5230XXE\u653b\u51fb\u7684\u5f71\u54cd\u3002<\/p>\n

\u81ea\u5df1\u5236\u4f5c\u5916\u90e8\u53c2\u8003\u5bf9\u8c61\u5982\u679c\u60f3\u8981\u6709\u9650\u5730\u4f7f\u7528\u5916\u90e8\u5f15\u7528\u529f\u80fd\u4f46\u53c8\u60f3\u907f\u514dXXE\uff0c\u5728\u9700\u8981\u4fee\u6539\u89e3\u6790\u5668\u6765\u9632\u6b62\u5916\u90e8\u5f15\u7528\u529f\u80fd\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u81ea\u884c\u7f16\u5199\u89e3\u6790\u5668\u3002<\/p>\n

\u6362\u53e5\u8bdd\u8bf4\uff0cjavax.xml.parsers.DocumentBuilder#setEntityResolver()\u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f”org.xml.sax.EntityResolver”\u63a5\u53e3\u7c7b\u578b\uff0c\u56e0\u6b64\u53ef\u4ee5\u81ea\u5b9a\u4e49\u7ee7\u627f\u8be5\u63a5\u53e3\u7684\u7c7b\uff0c\u5e76\u5c06\u5176\u5206\u914d\u7ed9javax.xml.parsers.DocumentBuilder#setEntityResolver()\u65b9\u6cd5\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c\u4ece\u800c\u53ef\u4ee5\u81ea\u7531\u5730\u63a7\u5236\u5916\u90e8\u5f15\u7528\u3002<\/p>\n

\u5fc5\u9808\u8986\u5199\u7684\u65b9\u6cd5\u53ea\u6709\u4e00\u4e2a\uff1a”org.xml.sax.InputSource.InputSource resolveEntity(String publicId,String systemId)”\u65b9\u6cd5\u3002<\/p>\n

\u8fd9\u91cc\u5173\u952e\u7684\u90e8\u5206\u662f\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2aString\u7c7b\u578b\uff0c\u7528\u4e8e\u6307\u793a\u5916\u90e8\u5f15\u7528\u7684URL\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u8fd4\u56de\u76f8\u5e94\u7684”org.xml.sax.InputSource.InputSource”\u7c7b\u578b\u5373\u53ef\u3002<\/p>\n

\u7136\u540e\uff0c\u53ea\u9700\u8981\u786e\u4fdd\u4ece\u8be5”org.xml.sax.InputSource.InputSource”\u7c7b\u578b\u6b63\u786e\u8fd4\u56de”java.io.InputStream”\u7c7b\u6216”java.io.Reader”\u7c7b\u5373\u53ef\u3002<\/p>\n

\u4f8b\u5982\uff0c\u53ef\u4ee5\u8fdb\u884c\u4e2a\u522b\u5b9a\u5236\uff0c\u5982\u9700\u8981\u9a8c\u8bc1\u6216\u4ec5\u5141\u8bb8\u7279\u5b9a\u7684URI\u3002<\/p>\n

\u5728\u6e90\u4ee3\u7801\u6587\u4ef6”exEntityResolver.java”\u7684exEntityResolver\u7c7b\u4e2d\uff0c\u51b3\u5b9a\u5bf9\u4e8e\u8868\u793a\u6240\u6709URI\u7684systemId\uff0c\u6700\u7ec8\u8fd4\u56de\u4e00\u4e2a\u7a7a\u7684java.io.ByteArrayInputStream\u7684exInputSource\u7c7b\u3002<\/p>\n

\u53d8\u6210\u8fd9\u6837\u7684\u611f\u89c9\u3002<\/p>\n

\"xxe-java-cust.png\"<\/p>\n

\u6e90\u4ee3\u7801\uff08XXEtest.java\uff09<\/p>\n
import<\/span> org.w3c.dom.Document<\/span>;<\/span>\r\nimport<\/span> org.w3c.dom.Node<\/span>;<\/span>\r\nimport<\/span> org.w3c.dom.NodeList<\/span>;<\/span>\r\nimport<\/span> javax.xml.parsers.DocumentBuilderFactory<\/span>;<\/span>\r\nimport<\/span> javax.xml.parsers.DocumentBuilder<\/span>;<\/span>\r\nimport<\/span> java.io.File<\/span>;<\/span>\r\nimport<\/span> org.xml.sax.EntityResolver<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> XXEtest<\/span>{<\/span>\r\n public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span> args<\/span>[]){<\/span>\r\n  System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"java.exe test <<inFile>> <<Resolver>>\"<\/span>);<\/span>\r\n  if<\/span>(<\/span>0<\/span> <<\/span> args<\/span>.<\/span>length<\/span>){<\/span>\r\n   Boolean<\/span> IsResolve<\/span> =<\/span> false<\/span>;<\/span>\r\n   exEntityResolver<\/span> myExEntityResolver<\/span> =<\/span> null<\/span>;<\/span>\r\n   if<\/span>(<\/span>1<\/span> <<\/span> args<\/span>.<\/span>length<\/span>){<\/span>\r\n    if<\/span>(<\/span>args<\/span>[<\/span>1<\/span>].<\/span>equals<\/span>(<\/span>\"null\"<\/span>)<\/span> ==<\/span> true<\/span>){<\/span>\r\n     IsResolve<\/span> =<\/span> true<\/span>;<\/span>\r\n    }<\/span>else<\/span>{<\/span>\r\n     myExEntityResolver<\/span> =<\/span> new<\/span> exEntityResolver<\/span>();<\/span>\r\n    }<\/span>\r\n   }<\/span>\r\n   try<\/span>{<\/span>\r\n    DocumentBuilderFactory<\/span> tempDocumentBuilderFactory<\/span> =<\/span> DocumentBuilderFactory<\/span>.<\/span>newInstance<\/span>();<\/span>\r\n    DocumentBuilder<\/span> tempDocumentBuilder<\/span> =<\/span> tempDocumentBuilderFactory<\/span>.<\/span>newDocumentBuilder<\/span>();<\/span>\r\n    if<\/span>(<\/span>IsResolve<\/span> ==<\/span> true<\/span>){<\/span>\r\n     tempDocumentBuilder<\/span>.<\/span>setEntityResolver<\/span>(<\/span>null<\/span>);<\/span>\r\n    }<\/span>else<\/span> if<\/span>(<\/span>myExEntityResolver<\/span> !=<\/span> null<\/span>){<\/span>\r\n     tempDocumentBuilder<\/span>.<\/span>setEntityResolver<\/span>(<\/span>myExEntityResolver<\/span>);<\/span>\r\n    }<\/span>\r\n    Document<\/span> tempDocument<\/span> =<\/span> tempDocumentBuilder<\/span>.<\/span>parse<\/span>(<\/span>new<\/span> File<\/span>(<\/span>args<\/span>[<\/span>0<\/span>]));<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"getTextContent  : \"<\/span> +<\/span> tempDocument<\/span>.<\/span>getTextContent<\/span>());<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>print<\/span>(<\/span>\"getXmlStandalone: \"<\/span>);<\/span>\r\n    tempDocument<\/span>.<\/span>setXmlStandalone<\/span>(<\/span>true<\/span>);<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>tempDocument<\/span>.<\/span>getXmlStandalone<\/span>());<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"========Detail=================\"<\/span>);<\/span>\r\n    PrintNode<\/span>(<\/span>tempDocument<\/span>.<\/span>getChildNodes<\/span>(),<\/span> \"\"<\/span>);<\/span>\r\n   }<\/span>catch<\/span>(<\/span>Exception<\/span> e<\/span>){<\/span>\r\n    e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n   }<\/span>\r\n  }<\/span>\r\n }<\/span>\r\n static<\/span> void<\/span> PrintNode<\/span>(<\/span>NodeList<\/span> nodeList<\/span>,<\/span> String<\/span> spacer<\/span>){<\/span>\r\n  Node<\/span> node<\/span> =<\/span> null<\/span>;<\/span>\r\n  for<\/span>(<\/span>int<\/span> i<\/span>=<\/span>0<\/span>;<\/span> i<\/span><<\/span> nodeList<\/span>.<\/span>getLength<\/span>();<\/span> i<\/span>++){<\/span>\r\n   node<\/span> =<\/span> nodeList<\/span>.<\/span>item<\/span>(<\/span>i<\/span>);<\/span>\r\n   String<\/span> typeStr<\/span> =<\/span> \"unknown\"<\/span>;<\/span>\r\n   switch<\/span>(<\/span>node<\/span>.<\/span>getNodeType<\/span>()){<\/span>\r\n    case<\/span> Node<\/span>.<\/span>ELEMENT_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"ELEMENT_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>ATTRIBUTE_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"ATTRIBUTE_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>TEXT_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"TEXT_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>CDATA_SECTION_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"CDATA_SECTION_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>ENTITY_REFERENCE_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"ENTITY_REFERENCE_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>ENTITY_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"ENTITY_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>PROCESSING_INSTRUCTION_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"PROCESSING_INSTRUCTION_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>COMMENT_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"COMMENT_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>DOCUMENT_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"DOCUMENT_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>DOCUMENT_TYPE_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"DOCUMENT_TYPE_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n    case<\/span> Node<\/span>.<\/span>NOTATION_NODE<\/span>:<\/span>\r\n     typeStr<\/span> =<\/span> \"NOTATION_NODE\"<\/span>;<\/span>\r\n     break<\/span>;<\/span>\r\n   }<\/span>\r\n   System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>spacer<\/span> +<\/span> \"name =\"<\/span> +<\/span> node<\/span>.<\/span>getNodeName<\/span>()<\/span> +<\/span> \", type=\"<\/span> +<\/span> typeStr<\/span>);<\/span>\r\n   System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>spacer<\/span> +<\/span> \"value=\"<\/span> +<\/span> node<\/span>.<\/span>getNodeValue<\/span>());<\/span>\r\n   System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>spacer<\/span> +<\/span> \"getTextContent=\"<\/span> +<\/span> node<\/span>.<\/span>getTextContent<\/span>());<\/span>\r\n   if<\/span>(<\/span>node<\/span>.<\/span>hasChildNodes<\/span>()<\/span> ==<\/span> true<\/span>){<\/span>\r\n    PrintNode<\/span>(<\/span>node<\/span>.<\/span>getChildNodes<\/span>(),<\/span> spacer<\/span> +<\/span> \" \"<\/span>);<\/span>\r\n   }<\/span>\r\n  }<\/span>\r\n }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6e90\u4ee3\u7801\uff08exEntityResolver.java\uff09
\n\u8fd4\u56de\u4e00\u4e2a\u4ec5\u8fd4\u56de\u7a7a\u7684 ByteArrayInputStream \u7684 InputSource \u7c7b\u7684\u89e3\u6790\u5668\u3002<\/p>\n
import<\/span> org.xml.sax.EntityResolver<\/span>;<\/span>\r\nimport<\/span> org.xml.sax.InputSource<\/span>;<\/span>\r\nimport<\/span> org.xml.sax.SAXException<\/span>;<\/span>\r\nimport<\/span> java.io.IOException<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> exEntityResolver<\/span> implements<\/span> EntityResolver<\/span>{<\/span>\r\n public<\/span> InputSource<\/span> resolveEntity<\/span>(<\/span>String<\/span> publicId<\/span>,<\/span> String<\/span> systemId<\/span>)<\/span> throws<\/span> SAXException<\/span>,<\/span> IOException<\/span>{<\/span>\r\n  System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"publicId: \"<\/span> +<\/span> publicId<\/span>);<\/span>\r\n  System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"systemId: \"<\/span> +<\/span> systemId<\/span>);<\/span>\r\n  return<\/span> (<\/span>InputSource<\/span>)<\/span>new<\/span> exInputSource<\/span>();<\/span>\r\n }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6e90\u4ee3\u7801\uff08exInputSource.java\uff09\u53ea\u8fd4\u56de\u4e00\u4e2a\u7a7a\u7684 ByteArrayInputStream \u7684 InputSource \u7c7b\u3002<\/p>\n
import<\/span> org.xml.sax.InputSource<\/span>;<\/span>\r\nimport<\/span> org.xml.sax.SAXException<\/span>;<\/span>\r\nimport<\/span> java.io.IOException<\/span>;<\/span>\r\nimport<\/span> java.io.InputStream<\/span>;<\/span>\r\nimport<\/span> java.io.ByteArrayInputStream<\/span>;<\/span>\r\nimport<\/span> java.io.Reader<\/span>;<\/span>\r\nimport<\/span> java.io.InputStreamReader<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> exInputSource<\/span> extends<\/span> InputSource<\/span>{<\/span>\r\n ByteArrayInputStream<\/span> myStream<\/span>;<\/span>\r\n public<\/span> exInputSource<\/span>(){<\/span>\r\n  byte<\/span>[]<\/span> hako<\/span> =<\/span> new<\/span> byte<\/span>[<\/span>0<\/span>];<\/span>\r\n  this<\/span>.<\/span>myStream<\/span> =<\/span> new<\/span> ByteArrayInputStream<\/span>(<\/span>hako<\/span>);<\/span>\r\n }<\/span>\r\n public<\/span> InputStream<\/span> getByteStream<\/span>(){<\/span>\r\n  return<\/span> (<\/span>InputStream<\/span>)<\/span>this<\/span>.<\/span>myStream<\/span>;<\/span>\r\n }<\/span>\r\n public<\/span> Reader<\/span> getCharacterStream<\/span>(){<\/span>\r\n  return<\/span> (<\/span>Reader<\/span>)<\/span>new<\/span> InputStreamReader<\/span>(<\/span>this<\/span>.<\/span>myStream<\/span>);<\/span>\r\n }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8fd4\u56de\u8fd4\u56de\u5230\u57fa\u672c\u7f16\u8f91\u680f<\/p>\n","protected":false},"excerpt":{"rendered":"
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