jacodb污点配置类名与代码中不一致问题

原创 已于 2024-08-08 16:27:43 修改 · 400 阅读 · 10 ·
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#java

于 2024-08-08 16:22:17 首次发布

问题

有如下测试代码：

java代码：

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String param = request.getHeader("BenchmarkTest00008");
        try {
            java.sql.Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/testdb", "root", "password");
            java.sql.CallableStatement statement = connection.prepareCall(param);
            java.sql.ResultSet rs = statement.executeQuery();
        } catch (java.sql.SQLException e) {
            throw new ServletException(e);
        }
    }

污点配置：

[
  {
    "_": "MethodSource",
    "methodInfo": {
      "cls": {
        "packageMatcher":{"_":"NameIsEqualTo","name":"javax.servlet.http"},
        "classNameMatcher":{"_":"NameIsEqualTo","name":"HttpServletRequest"}
      },
      "functionName": {"_":"NameIsEqualTo","name":"getHeader"},
      "parametersMatchers": [],
      "returnTypeMatcher": {"_":"AnyTypeMatches"},
      "applyToOverrides": true,
      "functionLabel": null,
      "modifier": -1,
      "exclude": []
    },
    "condition": {"_":"ConstantTrue"},
    "actionsAfter": [
      {"_":"AssignMark","mark":{"name":"UNTRUSTED"},"position":{"_":"Result"}}
    ]
  },
  {
    "_": "PassThrough",
    "methodInfo": {
      "cls": {
        "packageMatcher":{"_":"NameIsEqualTo","name":"java.sql"},
        "classNameMatcher":{"_":"NameIsEqualTo","name":"Connection"}
      },
      "functionName": {"_": "NameIsEqualTo","name": "prepareCall"},
      "parametersMatchers": [],
      "returnTypeMatcher": {"_": "AnyTypeMatches"},
      "applyToOverrides": true,
      "functionLabel": null,
      "modifier": -1,
      "exclude": []
    },
    "condition": {
      "_": "Or",
      "args": [
        {"_":"ContainsMark","mark":{"name":"UNTRUSTED"},"position":{"_":"Argument","number":0}},
        {"_":"ContainsMark","mark":{"name":"ENVIRONMENT"},"position":{"_":"Argument","number":0}}
      ]
    },
    "actionsAfter": [
      {"_":"CopyAllMarks","from":{"_":"Argument","number":0},"to":{"_":"Result"}}
    ]
  },
  {
    "_": "MethodSink",
    "ruleNote": "SQL-Injection",
    "cwe": [89],
    "methodInfo": {
      "cls": {
        "packageMatcher": {"_": "NameIsEqualTo","name": "java.sql"},
        "classNameMatcher": {"_": "NameMatches","pattern": "CallableStatement"}
      },
      "functionName": {"_":"NameMatches","pattern":"executeQuery"},
      "parametersMatchers": [],
      "returnTypeMatcher": {"_":"AnyTypeMatches"},
      "applyToOverrides": true,
      "functionLabel": null,
      "modifier": -1,
      "exclude": []
    },
    "condition": {
      "_": "Or",
      "args": [
        {
          "_": "ContainsMark",
          "position": {
            "_": "This"
          },
          "mark": {
            "name": "UNTRUSTED"
          }
        }
      ]
    }
  }
]

解决过程

测试代码，都是按照代码配置的规则，而且规则也比较简单。但是在测试时就是不报问题，检查了很多遍规则都没发下什么问题。加上了new edge的日志输出，内容如下：

NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=noop, fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=noop, fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%0 = request.getHeader("BenchmarkTest00008"), fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=this.doPost(request, response), fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%2 = java.sql.DriverManager.getConnection("jdbc:mysql://localhost:3306/testdb", "root", "password"), fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%2 = java.sql.DriverManager.getConnection("jdbc:mysql://localhost:3306/testdb", "root", "password"), fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=return, fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%4 = %2.prepareCall(%0), fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=catch (%9: java.sql.SQLException), fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%4 = %2.prepareCall(%0), fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=catch (%9: java.sql.SQLException), fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%6 = %4.executeQuery(), fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%11 = new javax.servlet.ServletException, fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%6 = %4.executeQuery(), fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%6 = %4.executeQuery(), fact=Tainted(variable=%4, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=catch (%9: java.sql.SQLException), fact=Tainted(variable=%4, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%11 = new javax.servlet.ServletException, fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=goto JcInstRef(index=9), fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%11.<init>(%9), fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=goto JcInstRef(index=9), fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=goto JcInstRef(index=9), fact=Tainted(variable=%4, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%11 = new javax.servlet.ServletException, fact=Tainted(variable=%4, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%11.<init>(%9), fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=return, fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=throw %11, fact=Zero))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=return, fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=return, fact=Tainted(variable=%4, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%11.<init>(%9), fact=Tainted(variable=%4, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=throw %11, fact=Tainted(variable=%0, mark=UNTRUSTED)))
NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=throw %11, fact=Tainted(variable=%4, mark=UNTRUSTED)))

从该条edge处理可以看出，污点已经传播到了%4变量，就是源码中的statement，而且标的也是“UNTRUSTED”，和MethodSink中配置的一致，只是结果没报问题。

NewEdge=Edge(from=Vertex(statement=noop, fact=Zero), to=Vertex(statement=%6 = %4.executeQuery(), fact=Tainted(variable=%4, mark=UNTRUSTED)))

后面拿源码一步一步debug，发现根据污点配置匹配MethodSink时，源码中的statement类型变成了PreparedStatement，而看代码应该是CallableStatement 。

java.sql.CallableStatement statement = connection.prepareCall(param);
java.sql.ResultSet rs = statement.executeQuery();

将MethodSink中的类名匹配给为“PreparedStatement”后，终于报出了问题。

(TaintAnalyzers.kt:76)- Found sink=Vertex(statement=%6 = %4.executeQuery(), fact=Tainted(variable=%4, mark=UNTRUSTED)) in (id:72)org.owasp.benchmark.testcode.BenchmarkTest00008#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)

此处也可以改成Statement，结合applyToVverrides参数设置为True，所有实现了Statement接口的类都可以匹配上了。

MethodSink配置改为

{
    "_": "MethodSink",
    "ruleNote": "SQL-Injection",
    "cwe": [89],
    "methodInfo": {
      "cls": {
        "packageMatcher": {"_": "NameIsEqualTo","name": "java.sql"},
        "classNameMatcher": {"_": "NameMatches","pattern": "Statement"}
      },
      "functionName": {"_":"NameMatches","pattern":"executeQuery"},
      "parametersMatchers": [],
      "returnTypeMatcher": {"_":"AnyTypeMatches"},
      "applyToOverrides": true,
      "functionLabel": null,
      "modifier": -1,
      "exclude": []
    },
    "condition": {
      "_": "Or",
      "args": [
        {
          "_": "ContainsMark",
          "position": {
            "_": "This"
          },
          "mark": {
            "name": "UNTRUSTED"
          }
        }
      ]
    }
  }

最终原因猜测

    Statement  和  PreparedStatement 以及 CallableStatement的关系为：

public interface CallableStatement extends PreparedStatement {
public interface PreparedStatement extends Statement {
三个接口依次继承，后面发现只有PreparedStatement定义了executeQuery()方法，CallableStatement没有executeQuery方法，Statement中定义的是executeQuery(String sql)，这就解析了为什么上面statement的类为PreparedStatement。

所有后续污点配置中需要关注类的层级问题，可以使配置文件精简一些，也可以避免配置错误。
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