Merge pull request #4564 from asgerf/js/react-hooks

Approved by esbena
2025-12-16 08:43:11 +01:00 · 2020-10-30 21:00:31 +00:00
parent ecc52a1bb9 c7667d372e
commit 4a59e69722
21 changed files with 669 additions and 66 deletions
--- a/change-notes/1.26/analysis-javascript.md
+++ b/change-notes/1.26/analysis-javascript.md
@@ -4,6 +4,10 @@

 * Angular-specific taint sources and sinks are now recognized by the security queries.

+* Support for React has improved, with better handling of react hooks, react-router path parameters, lazy-loaded components, and components transformed using `react-redux` and/or `styled-components`.
+
+* Dynamic imports are now analyzed more precisely.
+
 * Support for the following frameworks and libraries has been improved:
  - [@angular/*](https://www.npmjs.com/package/@angular/core)
  - [AWS Serverless](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-function.html)
@@ -29,7 +33,13 @@
  - [needle](https://www.npmjs.com/package/needle)
  - [object-inspect](https://www.npmjs.com/package/object-inspect)
  - [pretty-format](https://www.npmjs.com/package/pretty-format)
+  - [react](https://www.npmjs.com/package/react)
+  - [react-router-dom](https://www.npmjs.com/package/react-router-dom)
+  - [react-redux](https://www.npmjs.com/package/react-redux)
+  - [redis](https://www.npmjs.com/package/redis)
+  - [redux](https://www.npmjs.com/package/redux)
  - [stringify-object](https://www.npmjs.com/package/stringify-object)
+  - [styled-components](https://www.npmjs.com/package/styled-components)
  - [throttle-debounce](https://www.npmjs.com/package/throttle-debounce)
  - [underscore](https://www.npmjs.com/package/underscore)

--- a/javascript/ql/src/experimental/Security/CWE-94/ServerSideTemplateInjection.ql
+++ b/javascript/ql/src/experimental/Security/CWE-94/ServerSideTemplateInjection.ql
@@ -57,6 +57,10 @@ class SSTINunjucksSink extends ServerSideTemplateInjectionSink {
  }
 }

+class LodashTemplateSink extends ServerSideTemplateInjectionSink {
+  LodashTemplateSink() { this = LodashUnderscore::member("template").getACall().getArgument(0) }
+}
+
 from DataFlow::PathNode source, DataFlow::PathNode sink, ServerSideTemplateInjectionConfiguration c
 where c.hasFlowPath(source, sink)
 select sink.getNode(), source, sink,
--- a/javascript/ql/src/meta/analysis-quality/TaintSteps.ql
+++ b/javascript/ql/src/meta/analysis-quality/TaintSteps.ql
@@ -11,12 +11,22 @@
 import javascript
 import CallGraphQuality

-class BasicTaintConfiguration extends TaintTracking::Configuration {
-  BasicTaintConfiguration() { this = "BasicTaintConfiguration" }
-}
-
 predicate relevantStep(DataFlow::Node pred, DataFlow::Node succ) {
-  any(BasicTaintConfiguration cfg).isAdditionalFlowStep(pred, succ) and
+  (
+    any(TaintTracking::AdditionalTaintStep dts).step(pred, succ)
+    or
+    any(DataFlow::AdditionalFlowStep cfg).step(pred, succ)
+    or
+    any(DataFlow::AdditionalFlowStep cfg).step(pred, succ, _, _)
+    or
+    any(DataFlow::AdditionalFlowStep cfg).loadStep(pred, succ, _)
+    or
+    any(DataFlow::AdditionalFlowStep cfg).storeStep(pred, succ, _)
+    or
+    any(DataFlow::AdditionalFlowStep cfg).loadStoreStep(pred, succ, _, _)
+    or
+    any(DataFlow::AdditionalFlowStep cfg).loadStoreStep(pred, succ, _)
+  ) and
  not pred.getFile() instanceof IgnoredFile and
  not succ.getFile() instanceof IgnoredFile
 }
--- a/javascript/ql/src/semmle/javascript/Promises.qll
+++ b/javascript/ql/src/semmle/javascript/Promises.qll
@@ -641,3 +641,39 @@ private module ClosurePromise {
    override predicate step(DataFlow::Node src, DataFlow::Node dst) { src = pred and dst = this }
  }
 }
+
+private module DynamicImportSteps {
+  /**
+   * A step from an export value to its uses via dynamic imports.
+   *
+   * For example:
+   * ```js
+   * // foo.js
+   * export default Foo
+   *
+   * // bar.js
+   * let Foo = await import('./foo');
+   * ```
+   */
+  class DynamicImportStep extends PreCallGraphStep {
+    override predicate storeStep(DataFlow::Node pred, DataFlow::SourceNode succ, string prop) {
+      exists(DynamicImportExpr imprt |
+        pred = imprt.getImportedModule().getAnExportedValue("default") and
+        succ = imprt.flow() and
+        prop = Promises::valueProp()
+      )
+    }
+
+    override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
+      // Special-case code like `(await import(x)).Foo` to boost type tracking depth.
+      exists(
+        DynamicImportExpr imprt, string name, DataFlow::Node mid, DataFlow::SourceNode awaited
+      |
+        pred = imprt.getImportedModule().getAnExportedValue(name) and
+        mid.getALocalSource() = imprt.flow() and
+        PromiseFlow::loadStep(mid, awaited, Promises::valueProp()) and
+        succ = awaited.getAPropertyRead(name)
+      )
+    }
+  }
+}
--- a/javascript/ql/src/semmle/javascript/dataflow/Sources.qll
+++ b/javascript/ql/src/semmle/javascript/dataflow/Sources.qll
@@ -307,7 +307,8 @@ module SourceNode {
        astNode instanceof FunctionBindExpr or
        astNode instanceof DynamicImportExpr or
        astNode instanceof ImportSpecifier or
-        astNode instanceof ImportMetaExpr
+        astNode instanceof ImportMetaExpr or
+        astNode instanceof TaggedTemplateExpr
      )
      or
      DataFlow::parameterNode(this, _)
--- a/javascript/ql/src/semmle/javascript/dataflow/TaintTracking.qll
+++ b/javascript/ql/src/semmle/javascript/dataflow/TaintTracking.qll
@@ -327,7 +327,7 @@ module TaintTracking {
   * taint to flow from `v` to any read of `c2.state.p`, where `c2`
   * also is an instance of `C`.
   */
-  private class ReactComponentStateTaintStep extends AdditionalTaintStep, DataFlow::ValueNode {
+  private class ReactComponentStateTaintStep extends AdditionalTaintStep {
    DataFlow::Node source;

    ReactComponentStateTaintStep() {
@@ -358,7 +358,7 @@ module TaintTracking {
   * taint to flow from `v` to any read of `c2.props.p`, where `c2`
   * also is an instance of `C`.
   */
-  private class ReactComponentPropsTaintStep extends AdditionalTaintStep, DataFlow::ValueNode {
+  private class ReactComponentPropsTaintStep extends AdditionalTaintStep {
    DataFlow::Node source;

    ReactComponentPropsTaintStep() {
--- a/javascript/ql/src/semmle/javascript/frameworks/ComposedFunctions.qll
+++ b/javascript/ql/src/semmle/javascript/frameworks/ComposedFunctions.qll
@@ -5,31 +5,116 @@
 import javascript

 /**
- * A function composed from a collection of functions.
+ * A call to a function that constructs a function composition `f(g(h(...)))` from a
+ * series functions `f, g, h, ...`.
 */
-private class ComposedFunction extends DataFlow::CallNode {
-  ComposedFunction() {
-    exists(string name |
-      name = "just-compose" or
-      name = "compose-function"
-    |
-      this = DataFlow::moduleImport(name).getACall()
-    )
-    or
-    this = LodashUnderscore::member("flow").getACall()
+class FunctionCompositionCall extends DataFlow::CallNode {
+  FunctionCompositionCall::Range range;
+
+  FunctionCompositionCall() { this = range }
+
+  /**
+   * Gets the `i`th function in the composition `f(g(h(...)))`, counting from left to right.
+   *
+   * Note that this is the opposite of the order in which the function are invoked,
+   * that is, `g` occurs later than `f` in `f(g(...))` but is invoked before `f`.
+   */
+  DataFlow::Node getOperandNode(int i) { result = range.getOperandNode(i) }
+
+  /** Gets a node holding one of the functions to be composed. */
+  final DataFlow::Node getAnOperandNode() { result = getOperandNode(_) }
+
+  /**
+   * Gets the function flowing into the `i`th function in the composition `f(g(h(...)))`.
+   *
+   * Note that this is the opposite of the order in which the function are invoked,
+   * that is, `g` occurs later than `f` in `f(g(...))` but is invoked before `f`.
+   */
+  final DataFlow::FunctionNode getOperandFunction(int i) {
+    result = getOperandNode(i).getALocalSource()
+  }
+
+  /** Gets any of the functions being composed. */
+  final DataFlow::Node getAnOperandFunction() { result = getOperandFunction(_) }
+
+  /** Gets the number of functions being composed. */
+  int getNumOperand() { result = range.getNumOperand() }
+}
+
+/**
+ * Companion module to the `FunctionCompositionCall` class.
+ */
+module FunctionCompositionCall {
+  /**
+   * Class that determines the set of values in `FunctionCompositionCall`.
+   *
+   * May be subclassed to classify more calls as function compositions.
+   */
+  abstract class Range extends DataFlow::CallNode {
+    /**
+     * Gets the function flowing into the `i`th function in the composition `f(g(h(...)))`.
+     */
+    abstract DataFlow::Node getOperandNode(int i);
+
+    /** Gets the number of functions being composed. */
+    abstract int getNumOperand();
  }

  /**
-   * Gets the ith function in this composition.
+   * A function composition call that accepts its operands in an array or
+   * via the arguments list.
+   *
+   * For simplicity, we model every composition function as if it supported this.
   */
-  DataFlow::FunctionNode getFunction(int i) { result.flowsTo(getArgument(i)) }
+  abstract private class WithArrayOverloading extends Range {
+    /** Gets the `i`th argument to the call or the `i`th array element passed into the call. */
+    DataFlow::Node getEffectiveArgument(int i) {
+      result = getArgument(0).(DataFlow::ArrayCreationNode).getElement(i)
+      or
+      not getArgument(0) instanceof DataFlow::ArrayCreationNode and
+      result = getArgument(i)
+    }
+
+    override int getNumOperand() {
+      result = getArgument(0).(DataFlow::ArrayCreationNode).getSize()
+      or
+      not getArgument(0) instanceof DataFlow::ArrayCreationNode and
+      result = getNumArgument()
+    }
+  }
+
+  /** A call whose arguments are functions `f,g,h` which are composed into `f(g(h(...))` */
+  private class RightToLeft extends WithArrayOverloading {
+    RightToLeft() {
+      this = DataFlow::moduleImport(["compose-function"]).getACall()
+      or
+      this = DataFlow::moduleMember(["redux", "ramda"], "compose").getACall()
+      or
+      this = LodashUnderscore::member("flowRight").getACall()
+    }
+
+    override DataFlow::Node getOperandNode(int i) { result = getEffectiveArgument(i) }
+  }
+
+  /** A call whose arguments are functions `f,g,h` which are composed into `f(g(h(...))` */
+  private class LeftToRight extends WithArrayOverloading {
+    LeftToRight() {
+      this = DataFlow::moduleImport("just-compose").getACall()
+      or
+      this = LodashUnderscore::member("flow").getACall()
+    }
+
+    override DataFlow::Node getOperandNode(int i) {
+      result = getEffectiveArgument(getNumOperand() - i - 1)
+    }
+  }
 }

 /**
 * A taint step for a composed function.
 */
 private class ComposedFunctionTaintStep extends TaintTracking::AdditionalTaintStep {
-  ComposedFunction composed;
+  FunctionCompositionCall composed;
  DataFlow::CallNode call;

  ComposedFunctionTaintStep() {
@@ -38,25 +123,24 @@ private class ComposedFunctionTaintStep extends TaintTracking::AdditionalTaintSt
  }

  override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
-    exists(int fnIndex, DataFlow::FunctionNode fn | fn = composed.getFunction(fnIndex) |
-      // flow out of the composed call
-      fnIndex = composed.getNumArgument() - 1 and
-      pred = fn.getAReturn() and
-      succ = this
+    exists(int fnIndex, DataFlow::FunctionNode fn | fn = composed.getOperandFunction(fnIndex) |
+      // flow into the first function
+      fnIndex = composed.getNumOperand() - 1 and
+      exists(int callArgIndex |
+        pred = call.getArgument(callArgIndex) and
+        succ = fn.getParameter(callArgIndex)
+      )
      or
-      if fnIndex = 0
-      then
-        // flow into the first composed function
-        exists(int callArgIndex |
-          pred = call.getArgument(callArgIndex) and
-          succ = fn.getParameter(callArgIndex)
-        )
-      else
-        // flow through the composed functions
-        exists(DataFlow::FunctionNode predFn | predFn = composed.getFunction(fnIndex - 1) |
-          pred = predFn.getAReturn() and
-          succ = fn.getParameter(0)
-        )
+      // flow through the composed functions
+      exists(DataFlow::FunctionNode predFn | predFn = composed.getOperandFunction(fnIndex + 1) |
+        pred = predFn.getReturnNode() and
+        succ = fn.getParameter(0)
+      )
+      or
+      // flow out of the composed call
+      fnIndex = 0 and
+      pred = fn.getReturnNode() and
+      succ = this
    )
  }
 }
--- a/javascript/ql/src/semmle/javascript/frameworks/LodashUnderscore.qll
+++ b/javascript/ql/src/semmle/javascript/frameworks/LodashUnderscore.qll
@@ -407,7 +407,12 @@ module LodashUnderscore {
            "shuffle", "sample", "toArray", "partition", "compact", "first", "initial", "last",
            "rest", "flatten", "without", "difference", "uniq", "unique", "unzip", "transpose",
            "object", "chunk", "values", "mapObject", "pick", "omit", "defaults", "clone", "tap",
-            "identity"] and
+            "identity",
+            // String category
+            "camelCase", "capitalize", "deburr", "kebabCase", "lowerCase", "lowerFirst", "pad",
+            "padEnd", "padStart", "repeat", "replace", "snakeCase", "split", "startCase", "toLower",
+            "toUpper", "trim", "trimEnd", "trimStart", "truncate", "unescape", "upperCase",
+            "upperFirst", "words"] and
      pred = call.getArgument(0) and
      succ = call
      or
--- a/javascript/ql/src/semmle/javascript/frameworks/React.qll
+++ b/javascript/ql/src/semmle/javascript/frameworks/React.qll
@@ -3,6 +3,8 @@
 */

 import javascript
+private import semmle.javascript.dataflow.internal.FlowSteps as FlowSteps
+private import semmle.javascript.dataflow.internal.PreCallGraphStep

 /**
 * Gets a reference to the 'React' object.
@@ -548,3 +550,229 @@ private class ReactJSXElement extends JSXElement {
   */
  ReactComponent getComponent() { result = component }
 }
+
+/**
+ * Step through the state variable of a `useState` call.
+ *
+ * It returns a pair of the current state, and a callback to change the state.
+ *
+ * For example:
+ * ```js
+ * let [state, setState] = useState(initialValue);
+ * let [state, setState] = useState(() => initialValue); // lazy initial state
+ *
+ * setState(newState);
+ * setState(prevState => { ... });
+ * ```
+ */
+private class UseStateStep extends PreCallGraphStep {
+  override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
+    exists(DataFlow::CallNode call | call = react().getAMemberCall("useState") |
+      pred =
+        [call.getArgument(0), // initial state
+            call.getCallback(0).getReturnNode(), // lazy initial state
+            call.getAPropertyRead("1").getACall().getArgument(0), // setState invocation
+            call.getAPropertyRead("1").getACall().getCallback(0).getReturnNode()] and // setState with callback
+      succ = call.getAPropertyRead("0")
+      or
+      // Propagate current state into the callback argument of `setState(prevState => { ... })`
+      pred = call.getAPropertyRead("0") and
+      succ = call.getAPropertyRead("1").getACall().getCallback(0).getParameter(0)
+    )
+  }
+}
+
+/**
+ * A step through a React context object.
+ *
+ * For example:
+ * ```js
+ * let MyContext = React.createContext('foo');
+ *
+ * <MyContext.Provider value={pred}>
+ *   <Foo/>
+ * </MyContext.Provider>
+ *
+ * function Foo() {
+ *   let succ = useContext(MyContext);
+ * }
+ * ```
+ */
+private class UseContextStep extends PreCallGraphStep {
+  override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
+    exists(DataFlow::CallNode context |
+      pred = getAContextInput(context) and
+      succ = getAContextOutput(context)
+    )
+  }
+}
+
+/**
+ * Gets a data flow node referring to the result of the given `createContext` call.
+ */
+private DataFlow::SourceNode getAContextRef(DataFlow::CallNode createContext) {
+  createContext = react().getAMemberCall("createContext") and
+  result = createContext
+  or
+  // Track through imports/exports, but not full type tracking, so this can be used as a PreCallGraphStep.
+  exists(DataFlow::Node mid |
+    getAContextRef(createContext).flowsTo(mid) and
+    FlowSteps::propertyFlowStep(mid, result)
+  )
+}
+
+/**
+ * Gets a data flow node whose value is provided to the given context object.
+ *
+ * For example:
+ * ```jsx
+ * React.createContext(x);
+ * <MyContext.Provider value={x}>
+ * ```
+ */
+pragma[nomagic]
+private DataFlow::Node getAContextInput(DataFlow::CallNode createContext) {
+  createContext = react().getAMemberCall("createContext") and
+  result = createContext.getArgument(0) // initial value
+  or
+  exists(JSXElement provider |
+    getAContextRef(createContext)
+        .getAPropertyRead("Provider")
+        .flowsTo(provider.getNameExpr().flow()) and
+    result = provider.getAttributeByName("value").getValue().flow()
+  )
+}
+
+/**
+ * Gets a data flow node whose value is obtained from the given context object.
+ *
+ * For example:
+ * ```js
+ * let value = useContext(MyContext);
+ * ```
+ */
+pragma[nomagic]
+private DataFlow::SourceNode getAContextOutput(DataFlow::CallNode createContext) {
+  exists(DataFlow::CallNode call |
+    call = react().getAMemberCall("useContext") and
+    getAContextRef(createContext).flowsTo(call.getArgument(0)) and
+    result = call
+  )
+  or
+  exists(DataFlow::ClassNode cls |
+    getAContextRef(createContext).flowsTo(cls.getAPropertyWrite("contextType").getRhs()) and
+    result = cls.getAReceiverNode().getAPropertyRead("context")
+  )
+}
+
+/**
+ * A step through a `useMemo` call; for example:
+ * ```js
+ * let succ = useMemo(() => pred, []);
+ * ```
+ */
+private class UseMemoStep extends PreCallGraphStep {
+  override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
+    exists(DataFlow::CallNode call | call = react().getAMemberCall("useMemo") |
+      pred = call.getCallback(0).getReturnNode() and
+      succ = call
+    )
+  }
+}
+
+private DataFlow::SourceNode reactRouterDom() {
+  result = DataFlow::moduleImport("react-router-dom")
+}
+
+private class ReactRouterSource extends RemoteFlowSource {
+  ReactRouterSource() {
+    this = reactRouterDom().getAMemberCall("useParams")
+    or
+    this = reactRouterDom().getAMemberCall("useRouteMatch").getAPropertyRead(["params", "url"])
+  }
+
+  override string getSourceType() { result = "react-router path parameters" }
+}
+
+/**
+ * Holds if `mod` transitively depends on `react-router-dom`.
+ *
+ * We assume any React component in such a file may be used in a context where react-router
+ * injects the `location` property in its `props` object.
+ */
+private predicate dependsOnReactRouter(Module mod) {
+  mod.getAnImport().getImportedPath().getValue() = "react-router-dom"
+  or
+  dependsOnReactRouter(mod.getAnImportedModule())
+}
+
+/**
+ * A reference to the DOM location obtained through `react-router-dom`
+ *
+ * For example:
+ * ```js
+ * let location = useLocation();
+ *
+ * function MyComponent(props) {
+ *   props.location;
+ * }
+ * export default withRouter(MyComponent);
+ */
+private class ReactRouterLocationSource extends DOM::LocationSource::Range {
+  ReactRouterLocationSource() {
+    this = reactRouterDom().getAMemberCall("useLocation")
+    or
+    exists(ReactComponent component |
+      dependsOnReactRouter(component.getTopLevel()) and
+      this = component.getAPropRead("location")
+    )
+  }
+}
+
+/**
+ * Gets a reference to a function which, if called with a React component, returns wrapped
+ * version of that component, which we model as a direct reference to the underlying component.
+ */
+private DataFlow::SourceNode higherOrderComponentBuilder() {
+  // `memo(f)` returns a function that behaves as `f` but caches results
+  // It is sometimes used to wrap an entire functional component.
+  result = react().getAPropertyRead("memo")
+  or
+  result = DataFlow::moduleMember("react-redux", "connect").getACall()
+  or
+  result = reactRouterDom().getAPropertyRead("withRouter")
+  or
+  exists(FunctionCompositionCall compose |
+    higherOrderComponentBuilder().flowsTo(compose.getAnOperandNode()) and
+    result = compose
+  )
+}
+
+private class HigherOrderComponentStep extends PreCallGraphStep {
+  override predicate loadStep(DataFlow::Node pred, DataFlow::Node succ, string prop) {
+    // `lazy(() => P)` returns a proxy for the component eventually returned by
+    // the promise P. We model this call as simply returning the value in P.
+    // It is primarily used for lazy-loading of React components.
+    exists(DataFlow::CallNode call |
+      call = react().getAMemberCall("lazy") and
+      pred = call.getCallback(0).getReturnNode() and
+      succ = call and
+      prop = Promises::valueProp()
+    )
+  }
+
+  override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
+    exists(DataFlow::CallNode call |
+      call = higherOrderComponentBuilder().getACall() and
+      pred = call.getArgument(0) and
+      succ = call
+    )
+    or
+    exists(TaggedTemplateExpr expr, DataFlow::CallNode call |
+      call = DataFlow::moduleImport("styled-components").getACall() and
+      pred = call.getArgument(0) and
+      call.flowsTo(expr.getTag().flow()) and
+      succ = expr.flow()
+    )
+  }
+}
--- a/javascript/ql/test/library-tests/DataFlow/tests.expected
+++ b/javascript/ql/test/library-tests/DataFlow/tests.expected
@@ -1508,6 +1508,7 @@ sources
 | tst.js:50:14:53:3 | return of constructor of class A |
 | tst.js:51:5:51:13 | super(42) |
 | tst.js:58:1:58:3 | tag |
+| tst.js:58:1:58:13 | tag `x: ${x}` |
 | tst.js:61:1:61:5 | ::o.m |
 | tst.js:61:3:61:5 | o.m |
 | tst.js:62:1:62:4 | o::g |
--- a/javascript/ql/test/library-tests/frameworks/ComposedFunctions/compose.expected
+++ b/javascript/ql/test/library-tests/frameworks/ComposedFunctions/compose.expected
@@ -1,13 +1,13 @@
 | tst.js:10:10:10:15 | source |
 | tst.js:15:10:15:13 | f1() |
-| tst.js:20:10:20:23 | compose1(f2)() |
-| tst.js:28:10:28:27 | compose1(f3, f4)() |
-| tst.js:33:10:33:28 | compose1(o.f, f5)() |
-| tst.js:41:10:41:27 | compose1(f6, f7)() |
-| tst.js:49:10:49:33 | compose ... source) |
-| tst.js:61:10:61:40 | compose ... source) |
-| tst.js:66:10:66:30 | compose ... source) |
+| tst.js:20:10:20:24 | lcompose1(f2)() |
+| tst.js:28:10:28:28 | lcompose1(f3, f4)() |
+| tst.js:33:10:33:29 | lcompose1(o.f, f5)() |
+| tst.js:41:10:41:28 | lcompose1(f6, f7)() |
+| tst.js:49:10:49:34 | lcompos ... source) |
+| tst.js:61:10:61:41 | lcompos ... source) |
+| tst.js:66:10:66:31 | lcompos ... source) |
 | tst.js:89:10:89:31 | f18(und ... source) |
-| tst.js:94:10:94:24 | compose2(f19)() |
-| tst.js:99:10:99:24 | compose3(f20)() |
-| tst.js:104:10:104:24 | compose4(f21)() |
+| tst.js:94:10:94:30 | rcompos ...  o.f)() |
+| tst.js:99:10:99:30 | lcompos ...  f20)() |
+| tst.js:104:10:104:30 | lcompos ...  f21)() |
--- a/javascript/ql/test/library-tests/frameworks/ComposedFunctions/tst.js
+++ b/javascript/ql/test/library-tests/frameworks/ComposedFunctions/tst.js
@@ -1,8 +1,8 @@
-import compose1 from 'just-compose';
-import compose2 from 'compose-function';
-import compose3 from 'lodash.flow';
+import lcompose1 from 'just-compose';
+import rcompose2 from 'compose-function';
+import lcompose3 from 'lodash.flow';
 import _ from 'lodash';
-var compose4 = _.flow;
+var lcompose4 = _.flow;

 (function(){
    var source = SOURCE();
@@ -17,7 +17,7 @@ var compose4 = _.flow;
    function f2(){
        return source;
    }
-    SINK(compose1(f2)());
+    SINK(lcompose1(f2)());

    function f3(){

@@ -25,12 +25,12 @@ var compose4 = _.flow;
    function f4(){
        return source;
    }
-    SINK(compose1(f3, f4)());
+    SINK(lcompose1(f3, f4)());

    function f5(){
        return source;
    }
-    SINK(compose1(o.f, f5)());
+    SINK(lcompose1(o.f, f5)());

    function f6(){
        return source;
@@ -38,7 +38,7 @@ var compose4 = _.flow;
    function f7(x){
        return x;
    }
-    SINK(compose1(f6, f7)());
+    SINK(lcompose1(f6, f7)());

    function f8(x){
        return x;
@@ -46,7 +46,7 @@ var compose4 = _.flow;
    function f9(x){
        return x;
    }
-    SINK(compose1(f8, f9)(source));
+    SINK(lcompose1(f8, f9)(source));


    function f10(x){
@@ -58,12 +58,12 @@ var compose4 = _.flow;
    function f12(x){
        return x;
    }
-    SINK(compose1(f10, f11, f12)(source));
+    SINK(lcompose1(f10, f11, f12)(source));

    function f13(x){
        return x + 'foo' ;
    }
-    SINK(compose1(f13)(source));
+    SINK(lcompose1(f13)(source));

    function f14(){
        return undefined;
@@ -76,7 +76,7 @@ var compose4 = _.flow;
    function f16(){
        return undefined;
    }
-    SINK(compose1(f15, f16)()); // NO FLOW
+    SINK(lcompose1(f15, f16)()); // NO FLOW

    function f17(x, y){
        return y;
@@ -91,16 +91,21 @@ var compose4 = _.flow;
    function f19(){
        return source;
    }
-    SINK(compose2(f19)());
+    SINK(rcompose2(f19, o.f)());

    function f20(){
        return source;
    }
-    SINK(compose3(f20)());
+    SINK(lcompose3(f16, f20)());

    function f21(){
        return source;
    }
-    SINK(compose4(f21)());
+    SINK(lcompose4(f16, f21)());
+
+    function f22(){
+        return source;
+    }
+    SINK(lcompose3(f22, f16)()); // NO FLOW

 })();
--- a/javascript/ql/test/library-tests/frameworks/ReactJS/higherOrderComponent.jsx
+++ b/javascript/ql/test/library-tests/frameworks/ReactJS/higherOrderComponent.jsx
@@ -0,0 +1,24 @@
+import { memo } from 'react';
+import { connect } from 'react-redux';
+import { compose } from 'redux';
+import styled from 'styled-components';
+import unknownFunction from 'somewhere';
+
+import { MyComponent } from './exportedComponent';
+
+const StyledComponent = styled(MyComponent)`
+    color: red;
+`;
+
+function mapStateToProps(x) {
+    return x;
+}
+function mapDispatchToProps(x) {
+    return x;
+}
+
+const withConnect = connect(mapStateToProps, mapDispatchToProps);
+
+const ConnectedComponent = compose(withConnect, unknownFunction)(StyledComponent);
+
+export default memo(ConnectedComponent);
--- a/javascript/ql/test/library-tests/frameworks/ReactJS/tests.expected
+++ b/javascript/ql/test/library-tests/frameworks/ReactJS/tests.expected
@@ -227,6 +227,9 @@ test_ReactComponent_getACandidatePropsValue
 | props.js:30:46:30:67 | "propFr ... tProps" |
 | props.js:32:22:32:34 | "propFromJSX" |
 | props.js:34:33:34:53 | "propFr ... ructor" |
+| useHigherOrderComponent.jsx:5:33:5:37 | "red" |
+| useHigherOrderComponent.jsx:11:39:11:44 | "lazy" |
+| useHigherOrderComponent.jsx:17:40:17:46 | "lazy2" |
 test_ReactComponent
 | es5.js:1:31:11:1 | {\\n  dis ... ;\\n  }\\n} |
 | es5.js:18:33:22:1 | {\\n  ren ... ;\\n  }\\n} |
@@ -285,6 +288,9 @@ test_JSXname
 | thisAccesses.js:60:19:60:41 | <this.n ... s.name> | thisAccesses.js:60:20:60:28 | this.name | this.name | dot |
 | thisAccesses.js:61:19:61:41 | <this.t ... s.this> | thisAccesses.js:61:20:61:28 | this.this | this.this | dot |
 | thisAccesses_importedMappers.js:13:16:13:21 | <div/> | thisAccesses_importedMappers.js:13:17:13:19 | div | div | Identifier |
+| useHigherOrderComponent.jsx:5:12:5:39 | <SomeCo ... "red"/> | useHigherOrderComponent.jsx:5:13:5:25 | SomeComponent | SomeComponent | Identifier |
+| useHigherOrderComponent.jsx:11:12:11:46 | <LazyLo ... lazy"/> | useHigherOrderComponent.jsx:11:13:11:31 | LazyLoadedComponent | LazyLoadedComponent | Identifier |
+| useHigherOrderComponent.jsx:17:12:17:48 | <LazyLo ... azy2"/> | useHigherOrderComponent.jsx:17:13:17:32 | LazyLoadedComponent2 | LazyLoadedComponent2 | Identifier |
 test_JSXName_this
 | es5.js:4:12:4:45 | <div>He ... }</div> | es5.js:4:24:4:27 | this |
 | es5.js:20:12:20:44 | <h1>Hel ... e}</h1> | es5.js:20:24:20:27 | this |
--- a/javascript/ql/test/library-tests/frameworks/ReactJS/useHigherOrderComponent.jsx
+++ b/javascript/ql/test/library-tests/frameworks/ReactJS/useHigherOrderComponent.jsx
@@ -0,0 +1,18 @@
+import SomeComponent from './higherOrderComponent';
+import { lazy } from 'react';
+
+function foo() {
+    return <SomeComponent color="red"/>
+}
+
+const LazyLoadedComponent = lazy(() => import('./higherOrderComponent'));
+
+function bar() {
+    return <LazyLoadedComponent color="lazy"/>
+}
+
+const LazyLoadedComponent2 = lazy(() => import('./exportedComponent').then(m => m.MyComponent));
+
+function barz() {
+    return <LazyLoadedComponent2 color="lazy2"/>
+}
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/Xss.expected
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/Xss.expected
@@ -174,6 +174,36 @@ nodes
 | react-native.js:8:18:8:24 | tainted |
 | react-native.js:9:27:9:33 | tainted |
 | react-native.js:9:27:9:33 | tainted |
+| react-use-context.js:10:22:10:32 | window.name |
+| react-use-context.js:10:22:10:32 | window.name |
+| react-use-context.js:10:22:10:32 | window.name |
+| react-use-context.js:16:26:16:36 | window.name |
+| react-use-context.js:16:26:16:36 | window.name |
+| react-use-context.js:16:26:16:36 | window.name |
+| react-use-state.js:4:9:4:49 | state |
+| react-use-state.js:4:10:4:14 | state |
+| react-use-state.js:4:38:4:48 | window.name |
+| react-use-state.js:4:38:4:48 | window.name |
+| react-use-state.js:5:51:5:55 | state |
+| react-use-state.js:5:51:5:55 | state |
+| react-use-state.js:9:9:9:43 | state |
+| react-use-state.js:9:10:9:14 | state |
+| react-use-state.js:10:14:10:24 | window.name |
+| react-use-state.js:10:14:10:24 | window.name |
+| react-use-state.js:11:51:11:55 | state |
+| react-use-state.js:11:51:11:55 | state |
+| react-use-state.js:15:9:15:43 | state |
+| react-use-state.js:15:10:15:14 | state |
+| react-use-state.js:16:20:16:30 | window.name |
+| react-use-state.js:16:20:16:30 | window.name |
+| react-use-state.js:17:51:17:55 | state |
+| react-use-state.js:17:51:17:55 | state |
+| react-use-state.js:21:10:21:14 | state |
+| react-use-state.js:22:14:22:17 | prev |
+| react-use-state.js:23:35:23:38 | prev |
+| react-use-state.js:23:35:23:38 | prev |
+| react-use-state.js:25:20:25:30 | window.name |
+| react-use-state.js:25:20:25:30 | window.name |
 | sanitiser.js:16:7:16:27 | tainted |
 | sanitiser.js:16:17:16:27 | window.name |
 | sanitiser.js:16:17:16:27 | window.name |
@@ -737,6 +767,28 @@ edges
 | react-native.js:7:7:7:33 | tainted | react-native.js:9:27:9:33 | tainted |
 | react-native.js:7:17:7:33 | req.param("code") | react-native.js:7:7:7:33 | tainted |
 | react-native.js:7:17:7:33 | req.param("code") | react-native.js:7:7:7:33 | tainted |
+| react-use-context.js:10:22:10:32 | window.name | react-use-context.js:10:22:10:32 | window.name |
+| react-use-context.js:16:26:16:36 | window.name | react-use-context.js:16:26:16:36 | window.name |
+| react-use-state.js:4:9:4:49 | state | react-use-state.js:5:51:5:55 | state |
+| react-use-state.js:4:9:4:49 | state | react-use-state.js:5:51:5:55 | state |
+| react-use-state.js:4:10:4:14 | state | react-use-state.js:4:9:4:49 | state |
+| react-use-state.js:4:38:4:48 | window.name | react-use-state.js:4:10:4:14 | state |
+| react-use-state.js:4:38:4:48 | window.name | react-use-state.js:4:10:4:14 | state |
+| react-use-state.js:9:9:9:43 | state | react-use-state.js:11:51:11:55 | state |
+| react-use-state.js:9:9:9:43 | state | react-use-state.js:11:51:11:55 | state |
+| react-use-state.js:9:10:9:14 | state | react-use-state.js:9:9:9:43 | state |
+| react-use-state.js:10:14:10:24 | window.name | react-use-state.js:9:10:9:14 | state |
+| react-use-state.js:10:14:10:24 | window.name | react-use-state.js:9:10:9:14 | state |
+| react-use-state.js:15:9:15:43 | state | react-use-state.js:17:51:17:55 | state |
+| react-use-state.js:15:9:15:43 | state | react-use-state.js:17:51:17:55 | state |
+| react-use-state.js:15:10:15:14 | state | react-use-state.js:15:9:15:43 | state |
+| react-use-state.js:16:20:16:30 | window.name | react-use-state.js:15:10:15:14 | state |
+| react-use-state.js:16:20:16:30 | window.name | react-use-state.js:15:10:15:14 | state |
+| react-use-state.js:21:10:21:14 | state | react-use-state.js:22:14:22:17 | prev |
+| react-use-state.js:22:14:22:17 | prev | react-use-state.js:23:35:23:38 | prev |
+| react-use-state.js:22:14:22:17 | prev | react-use-state.js:23:35:23:38 | prev |
+| react-use-state.js:25:20:25:30 | window.name | react-use-state.js:21:10:21:14 | state |
+| react-use-state.js:25:20:25:30 | window.name | react-use-state.js:21:10:21:14 | state |
 | sanitiser.js:16:7:16:27 | tainted | sanitiser.js:23:29:23:35 | tainted |
 | sanitiser.js:16:7:16:27 | tainted | sanitiser.js:30:29:30:35 | tainted |
 | sanitiser.js:16:7:16:27 | tainted | sanitiser.js:33:29:33:35 | tainted |
@@ -1140,6 +1192,12 @@ edges
 | optionalSanitizer.js:45:18:45:56 | sanitiz ...  target | optionalSanitizer.js:26:16:26:32 | document.location | optionalSanitizer.js:45:18:45:56 | sanitiz ...  target | Cross-site scripting vulnerability due to $@. | optionalSanitizer.js:26:16:26:32 | document.location | user-provided value |
 | react-native.js:8:18:8:24 | tainted | react-native.js:7:17:7:33 | req.param("code") | react-native.js:8:18:8:24 | tainted | Cross-site scripting vulnerability due to $@. | react-native.js:7:17:7:33 | req.param("code") | user-provided value |
 | react-native.js:9:27:9:33 | tainted | react-native.js:7:17:7:33 | req.param("code") | react-native.js:9:27:9:33 | tainted | Cross-site scripting vulnerability due to $@. | react-native.js:7:17:7:33 | req.param("code") | user-provided value |
+| react-use-context.js:10:22:10:32 | window.name | react-use-context.js:10:22:10:32 | window.name | react-use-context.js:10:22:10:32 | window.name | Cross-site scripting vulnerability due to $@. | react-use-context.js:10:22:10:32 | window.name | user-provided value |
+| react-use-context.js:16:26:16:36 | window.name | react-use-context.js:16:26:16:36 | window.name | react-use-context.js:16:26:16:36 | window.name | Cross-site scripting vulnerability due to $@. | react-use-context.js:16:26:16:36 | window.name | user-provided value |
+| react-use-state.js:5:51:5:55 | state | react-use-state.js:4:38:4:48 | window.name | react-use-state.js:5:51:5:55 | state | Cross-site scripting vulnerability due to $@. | react-use-state.js:4:38:4:48 | window.name | user-provided value |
+| react-use-state.js:11:51:11:55 | state | react-use-state.js:10:14:10:24 | window.name | react-use-state.js:11:51:11:55 | state | Cross-site scripting vulnerability due to $@. | react-use-state.js:10:14:10:24 | window.name | user-provided value |
+| react-use-state.js:17:51:17:55 | state | react-use-state.js:16:20:16:30 | window.name | react-use-state.js:17:51:17:55 | state | Cross-site scripting vulnerability due to $@. | react-use-state.js:16:20:16:30 | window.name | user-provided value |
+| react-use-state.js:23:35:23:38 | prev | react-use-state.js:25:20:25:30 | window.name | react-use-state.js:23:35:23:38 | prev | Cross-site scripting vulnerability due to $@. | react-use-state.js:25:20:25:30 | window.name | user-provided value |
 | sanitiser.js:23:21:23:44 | '<b>' + ...  '</b>' | sanitiser.js:16:17:16:27 | window.name | sanitiser.js:23:21:23:44 | '<b>' + ...  '</b>' | Cross-site scripting vulnerability due to $@. | sanitiser.js:16:17:16:27 | window.name | user-provided value |
 | sanitiser.js:30:21:30:44 | '<b>' + ...  '</b>' | sanitiser.js:16:17:16:27 | window.name | sanitiser.js:30:21:30:44 | '<b>' + ...  '</b>' | Cross-site scripting vulnerability due to $@. | sanitiser.js:16:17:16:27 | window.name | user-provided value |
 | sanitiser.js:33:21:33:44 | '<b>' + ...  '</b>' | sanitiser.js:16:17:16:27 | window.name | sanitiser.js:33:21:33:44 | '<b>' + ...  '</b>' | Cross-site scripting vulnerability due to $@. | sanitiser.js:16:17:16:27 | window.name | user-provided value |
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/XssWithAdditionalSources.expected
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/XssWithAdditionalSources.expected
@@ -174,6 +174,36 @@ nodes
 | react-native.js:8:18:8:24 | tainted |
 | react-native.js:9:27:9:33 | tainted |
 | react-native.js:9:27:9:33 | tainted |
+| react-use-context.js:10:22:10:32 | window.name |
+| react-use-context.js:10:22:10:32 | window.name |
+| react-use-context.js:10:22:10:32 | window.name |
+| react-use-context.js:16:26:16:36 | window.name |
+| react-use-context.js:16:26:16:36 | window.name |
+| react-use-context.js:16:26:16:36 | window.name |
+| react-use-state.js:4:9:4:49 | state |
+| react-use-state.js:4:10:4:14 | state |
+| react-use-state.js:4:38:4:48 | window.name |
+| react-use-state.js:4:38:4:48 | window.name |
+| react-use-state.js:5:51:5:55 | state |
+| react-use-state.js:5:51:5:55 | state |
+| react-use-state.js:9:9:9:43 | state |
+| react-use-state.js:9:10:9:14 | state |
+| react-use-state.js:10:14:10:24 | window.name |
+| react-use-state.js:10:14:10:24 | window.name |
+| react-use-state.js:11:51:11:55 | state |
+| react-use-state.js:11:51:11:55 | state |
+| react-use-state.js:15:9:15:43 | state |
+| react-use-state.js:15:10:15:14 | state |
+| react-use-state.js:16:20:16:30 | window.name |
+| react-use-state.js:16:20:16:30 | window.name |
+| react-use-state.js:17:51:17:55 | state |
+| react-use-state.js:17:51:17:55 | state |
+| react-use-state.js:21:10:21:14 | state |
+| react-use-state.js:22:14:22:17 | prev |
+| react-use-state.js:23:35:23:38 | prev |
+| react-use-state.js:23:35:23:38 | prev |
+| react-use-state.js:25:20:25:30 | window.name |
+| react-use-state.js:25:20:25:30 | window.name |
 | sanitiser.js:16:7:16:27 | tainted |
 | sanitiser.js:16:17:16:27 | window.name |
 | sanitiser.js:16:17:16:27 | window.name |
@@ -741,6 +771,28 @@ edges
 | react-native.js:7:7:7:33 | tainted | react-native.js:9:27:9:33 | tainted |
 | react-native.js:7:17:7:33 | req.param("code") | react-native.js:7:7:7:33 | tainted |
 | react-native.js:7:17:7:33 | req.param("code") | react-native.js:7:7:7:33 | tainted |
+| react-use-context.js:10:22:10:32 | window.name | react-use-context.js:10:22:10:32 | window.name |
+| react-use-context.js:16:26:16:36 | window.name | react-use-context.js:16:26:16:36 | window.name |
+| react-use-state.js:4:9:4:49 | state | react-use-state.js:5:51:5:55 | state |
+| react-use-state.js:4:9:4:49 | state | react-use-state.js:5:51:5:55 | state |
+| react-use-state.js:4:10:4:14 | state | react-use-state.js:4:9:4:49 | state |
+| react-use-state.js:4:38:4:48 | window.name | react-use-state.js:4:10:4:14 | state |
+| react-use-state.js:4:38:4:48 | window.name | react-use-state.js:4:10:4:14 | state |
+| react-use-state.js:9:9:9:43 | state | react-use-state.js:11:51:11:55 | state |
+| react-use-state.js:9:9:9:43 | state | react-use-state.js:11:51:11:55 | state |
+| react-use-state.js:9:10:9:14 | state | react-use-state.js:9:9:9:43 | state |
+| react-use-state.js:10:14:10:24 | window.name | react-use-state.js:9:10:9:14 | state |
+| react-use-state.js:10:14:10:24 | window.name | react-use-state.js:9:10:9:14 | state |
+| react-use-state.js:15:9:15:43 | state | react-use-state.js:17:51:17:55 | state |
+| react-use-state.js:15:9:15:43 | state | react-use-state.js:17:51:17:55 | state |
+| react-use-state.js:15:10:15:14 | state | react-use-state.js:15:9:15:43 | state |
+| react-use-state.js:16:20:16:30 | window.name | react-use-state.js:15:10:15:14 | state |
+| react-use-state.js:16:20:16:30 | window.name | react-use-state.js:15:10:15:14 | state |
+| react-use-state.js:21:10:21:14 | state | react-use-state.js:22:14:22:17 | prev |
+| react-use-state.js:22:14:22:17 | prev | react-use-state.js:23:35:23:38 | prev |
+| react-use-state.js:22:14:22:17 | prev | react-use-state.js:23:35:23:38 | prev |
+| react-use-state.js:25:20:25:30 | window.name | react-use-state.js:21:10:21:14 | state |
+| react-use-state.js:25:20:25:30 | window.name | react-use-state.js:21:10:21:14 | state |
 | sanitiser.js:16:7:16:27 | tainted | sanitiser.js:23:29:23:35 | tainted |
 | sanitiser.js:16:7:16:27 | tainted | sanitiser.js:30:29:30:35 | tainted |
 | sanitiser.js:16:7:16:27 | tainted | sanitiser.js:33:29:33:35 | tainted |
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/react-create-context.js
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/react-create-context.js
@@ -0,0 +1,3 @@
+import { createContext } from 'react';
+
+export let MyContext = createContext({root: null});
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/react-provide-context.js
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/react-provide-context.js
@@ -0,0 +1,5 @@
+import { MyContext } from './react-create-context';
+
+export function renderMain() {
+    return <MyContext.Provider value={{root: document.body}}></MyContext.Provider>
+}
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/react-use-context.js
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/react-use-context.js
@@ -0,0 +1,20 @@
+import { useContext, Component } from 'react';
+import { MyContext } from './react-create-context';
+
+function useMyContext() {
+    return useContext(MyContext);
+}
+
+export function useDoc1() {
+    let { root } = useMyContext();
+    root.appendChild(window.name); // NOT OK
+}
+
+class C extends Component {
+    foo() {
+        let { root } = this.context;
+        root.appendChild(window.name); // NOT OK
+    }
+}
+
+C.contextType = MyContext;
--- a/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/react-use-state.js
+++ b/javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/react-use-state.js
@@ -0,0 +1,33 @@
+import { useState } from 'react';
+
+function initialState() {
+    let [state, setState] = useState(window.name);
+    return <div dangerouslySetInnerHTML={{__html: state}}></div>; // NOT OK
+}
+
+function setStateValue() {
+    let [state, setState] = useState('foo');
+    setState(window.name);
+    return <div dangerouslySetInnerHTML={{__html: state}}></div>; // NOT OK
+}
+
+function setStateValueLazy() {
+    let [state, setState] = useState('foo');
+    setState(() => window.name);
+    return <div dangerouslySetInnerHTML={{__html: state}}></div>; // NOT OK
+}
+
+function setStateValueLazy() {
+    let [state, setState] = useState('foo');
+    setState(prev => {
+        document.body.innerHTML = prev; // NOT OK
+    })
+    setState(() => window.name);
+}
+
+function setStateValueSafe() {
+    let [state, setState] = useState('foo');
+    setState('safe');
+    setState(() => 'also safe');
+    return <div dangerouslySetInnerHTML={{__html: state}}></div>; // OK
+}