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Decouple XsltInjection.qll to reuse the taint tracking configuration
1 parent fc58ada commit 6967b06

5 files changed

Lines changed: 43 additions & 54 deletions

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‎java/ql/lib/semmle/code/java/dataflow/ExternalFlow.qll‎

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@@ -110,6 +110,7 @@ private module Frameworks {
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private import semmle.code.java.security.MvelInjection
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private import semmle.code.java.security.OgnlInjection
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private import semmle.code.java.security.XPath
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private import semmle.code.java.security.XsltInjectionSinkModels
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private import semmle.code.java.frameworks.android.Android
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private import semmle.code.java.frameworks.android.SQLite
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private import semmle.code.java.frameworks.Jdbc

‎java/ql/src/Security/CWE/CWE-074/XsltInjection.ql‎

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@@ -11,29 +11,9 @@
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*/
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import java
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import semmle.code.java.dataflow.FlowSources
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import semmle.code.java.security.XsltInjection
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import semmle.code.java.security.XsltInjectionQuery
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import DataFlow::PathGraph
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/**
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* A taint-tracking configuration for unvalidated user input that is used in XSLT transformation.
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*/
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class XsltInjectionFlowConfig extends TaintTracking::Configuration {
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XsltInjectionFlowConfig() { this = "XsltInjectionFlowConfig" }
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override predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
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override predicate isSink(DataFlow::Node sink) { sink instanceof XsltInjectionSink }
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override predicate isSanitizer(DataFlow::Node node) {
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node.getType() instanceof PrimitiveType or node.getType() instanceof BoxedType
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}
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override predicate isAdditionalTaintStep(DataFlow::Node node1, DataFlow::Node node2) {
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any(XsltInjectionAdditionalTaintStep c).step(node1, node2)
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}
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}
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from DataFlow::PathNode source, DataFlow::PathNode sink, XsltInjectionFlowConfig conf
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where conf.hasFlowPath(source, sink)
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select sink.getNode(), source, sink, "XSLT transformation might include stylesheet from $@.",

java/ql/src/semmle/code/java/security/XsltInjection.qll renamed to java/ql/src/semmle/code/java/security/XsltInjectionQuery.qll

Lines changed: 20 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
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/** Provides classes to reason about XSLT injection vulnerabilities. */
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import java
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import semmle.code.java.dataflow.ExternalFlow
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import semmle.code.java.dataflow.FlowSources
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import semmle.code.java.security.XmlParsers
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import semmle.code.java.dataflow.DataFlow
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@@ -11,20 +11,6 @@ import semmle.code.java.dataflow.DataFlow
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*/
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abstract class XsltInjectionSink extends DataFlow::Node { }
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private class DefaultXsltInjectionSinkModel extends SinkModelCsv {
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override predicate row(string row) {
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row =
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[
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"javax.xml.transform;Transformer;false;transform;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;XsltTransformer;false;transform;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;Xslt30Transformer;false;transform;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;Xslt30Transformer;false;applyTemplates;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;Xslt30Transformer;false;callFunction;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;Xslt30Transformer;false;callTemplate;;;Argument[-1];xslt"
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]
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}
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}
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/** A default sink representing methods susceptible to XSLT Injection attacks. */
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private class DefaultXsltInjectionSink extends XsltInjectionSink {
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DefaultXsltInjectionSink() { sinkNode(this, "xslt") }
@@ -59,6 +45,25 @@ private class DefaultXsltInjectionAdditionalTaintStep extends XsltInjectionAddit
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}
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}
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/**
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* A taint-tracking configuration for unvalidated user input that is used in XSLT transformation.
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*/
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class XsltInjectionFlowConfig extends TaintTracking::Configuration {
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XsltInjectionFlowConfig() { this = "XsltInjectionFlowConfig" }
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override predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
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override predicate isSink(DataFlow::Node sink) { sink instanceof XsltInjectionSink }
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override predicate isSanitizer(DataFlow::Node node) {
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node.getType() instanceof PrimitiveType or node.getType() instanceof BoxedType
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}
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override predicate isAdditionalTaintStep(DataFlow::Node node1, DataFlow::Node node2) {
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any(XsltInjectionAdditionalTaintStep c).step(node1, node2)
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}
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}
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/**
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* Holds if `n1` to `n2` is a dataflow step that converts between `InputStream` or `Reader` and
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* `XMLStreamReader`, i.e. `XMLInputFactory.createXMLStreamReader(tainted)`.

‎java/ql/src/semmle/code/java/security/XsltInjectionSinkModels.qll‎

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@@ -0,0 +1,17 @@
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/** Provides sink models relating to XSLT injection vulnerabilities. */
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import semmle.code.java.dataflow.ExternalFlow
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private class DefaultXsltInjectionSinkModel extends SinkModelCsv {
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override predicate row(string row) {
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row =
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[
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"javax.xml.transform;Transformer;false;transform;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;XsltTransformer;false;transform;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;Xslt30Transformer;false;transform;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;Xslt30Transformer;false;applyTemplates;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;Xslt30Transformer;false;callFunction;;;Argument[-1];xslt",
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"net.sf.saxon.s9api;Xslt30Transformer;false;callTemplate;;;Argument[-1];xslt"
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]
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}
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}

‎java/ql/test/query-tests/security/CWE-074/XsltInjectionTest.ql‎

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@@ -1,33 +1,19 @@
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import java
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import semmle.code.java.dataflow.TaintTracking
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import semmle.code.java.dataflow.FlowSources
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import semmle.code.java.security.XsltInjection
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import semmle.code.java.security.XsltInjectionQuery
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import TestUtilities.InlineExpectationsTest
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class Conf extends TaintTracking::Configuration {
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Conf() { this = "test:cwe:xslt-injection" }
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override predicate isSource(DataFlow::Node source) { source instanceof RemoteFlowSource }
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override predicate isSink(DataFlow::Node sink) { sink instanceof XsltInjectionSink }
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override predicate isSanitizer(DataFlow::Node node) {
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node.getType() instanceof PrimitiveType or node.getType() instanceof BoxedType
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}
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override predicate isAdditionalTaintStep(DataFlow::Node node1, DataFlow::Node node2) {
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any(XsltInjectionAdditionalTaintStep c).step(node1, node2)
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}
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}
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class HasXsltInjectionTest extends InlineExpectationsTest {
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HasXsltInjectionTest() { this = "HasXsltInjectionTest" }
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override string getARelevantTag() { result = "hasXsltInjection" }
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override predicate hasActualResult(Location location, string element, string tag, string value) {
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tag = "hasXsltInjection" and
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exists(DataFlow::Node src, DataFlow::Node sink, Conf conf | conf.hasFlow(src, sink) |
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exists(DataFlow::Node src, DataFlow::Node sink, XsltInjectionFlowConfig conf |
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conf.hasFlow(src, sink)
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|
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sink.getLocation() = location and
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element = sink.toString() and
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value = ""

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