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Deduplicate Jexl configuration

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This commit is contained in:
Chris Smowton
2021-07-02 09:40:46 +01:00
parent d022c57903
commit a51154a8ef
3 changed files with 21 additions and 34 deletions
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18
java/ql/src/Security/CWE/CWE-094/JexlInjection.ql
View File

@@ -12,27 +12,9 @@
*/
import java
import semmle.code.java.dataflow.FlowSources
import semmle.code.java.security.JexlInjectionQuery
import DataFlow::PathGraph
/**
* A taint-tracking configuration for unsafe user input
* that is used to construct and evaluate a JEXL expression.
* It supports both JEXL 2 and 3.
*/
class JexlInjectionConfig extends TaintTracking::Configuration {
JexlInjectionConfig() { this = "JexlInjectionConfig" }
override predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
override predicate isSink(DataFlow::Node sink) { sink instanceof JexlEvaluationSink }
override predicate isAdditionalTaintStep(DataFlow::Node node1, DataFlow::Node node2) {
any(JexlInjectionAdditionalTaintStep c).step(node1, node2)
}
}
from DataFlow::PathNode source, DataFlow::PathNode sink, JexlInjectionConfig conf
where conf.hasFlowPath(source, sink)
select sink.getNode(), source, sink, "JEXL injection from $@.", source.getNode(), "this user input"

18
java/ql/src/semmle/code/java/security/JexlInjectionQuery.qll
View File

@@ -2,6 +2,7 @@
import java
import semmle.code.java.dataflow.TaintTracking
import semmle.code.java.dataflow.FlowSources
private import semmle.code.java.dataflow.ExternalFlow
/**
@@ -37,6 +38,23 @@ private class DefaultJexlInjectionAdditionalTaintStep extends JexlInjectionAddit
}
}
/**
* A taint-tracking configuration for unsafe user input
* that is used to construct and evaluate a JEXL expression.
* It supports both JEXL 2 and 3.
*/
class JexlInjectionConfig extends TaintTracking::Configuration {
JexlInjectionConfig() { this = "JexlInjectionConfig" }
override predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
override predicate isSink(DataFlow::Node sink) { sink instanceof JexlEvaluationSink }
override predicate isAdditionalTaintStep(DataFlow::Node node1, DataFlow::Node node2) {
any(JexlInjectionAdditionalTaintStep c).step(node1, node2)
}
}
/**
* Holds if `n1` to `n2` is a dataflow step that creates a JEXL script using an unsafe engine
* by calling `tainted.createScript(jexlExpr)`.

19
java/ql/test/query-tests/security/CWE-094/JexlInjectionTest.ql
View File

@@ -1,22 +1,7 @@
import java
import semmle.code.java.dataflow.DataFlow
import semmle.code.java.dataflow.FlowSteps
import semmle.code.java.dataflow.FlowSources
import semmle.code.java.security.JexlInjectionQuery
import TestUtilities.InlineExpectationsTest
class Conf extends TaintTracking::Configuration {
Conf() { this = "qltest:cwe:jexl-injection" }
override predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
override predicate isSink(DataFlow::Node sink) { sink instanceof JexlEvaluationSink }
override predicate isAdditionalTaintStep(DataFlow::Node node1, DataFlow::Node node2) {
any(JexlInjectionAdditionalTaintStep c).step(node1, node2)
}
}
class JexlInjectionTest extends InlineExpectationsTest {
JexlInjectionTest() { this = "HasJexlInjectionTest" }
@@ -24,7 +9,9 @@ class JexlInjectionTest extends InlineExpectationsTest {
override predicate hasActualResult(Location location, string element, string tag, string value) {
tag = "hasJexlInjection" and
exists(DataFlow::Node src, DataFlow::Node sink, Conf conf | conf.hasFlow(src, sink) |
exists(DataFlow::Node src, DataFlow::Node sink, JexlInjectionConfig conf |
conf.hasFlow(src, sink)
|
sink.getLocation() = location and
element = sink.toString() and
value = ""