Merge pull request #14120 from asgerf/dynamic/typemodel-istypeused

Dynamic: add TypeModel.isTypeUsed

javascript/ql/lib/semmle/javascript/dataflow/internal/DataFlowNode.qll

@@ -33,4 +33,10 @@ newtype TNode =
   TExceptionalInvocationReturnNode(InvokeExpr e) or
   TGlobalAccessPathRoot() or
   TTemplatePlaceholderTag(Templating::TemplatePlaceholderTag tag) or
-  TReflectiveParametersNode(Function f)
+  TReflectiveParametersNode(Function f) or
+  TForbiddenRecursionGuard() {
+    none() and
+    // We want to prune irrelevant models before materialising data flow nodes, so types contributed
+    // directly from CodeQL must expose their pruning info without depending on data flow nodes.
+    (any(ModelInput::TypeModel tm).isTypeUsed("") implies any())
+  }

javascript/ql/lib/semmle/javascript/frameworks/data/internal/ApiGraphModels.qll

@@ -168,9 +168,20 @@ module ModelInput {
    * A unit class for adding additional type model rows from CodeQL models.
    */
   class TypeModel extends Unit {
+    /**
+     * Holds if any of the other predicates in this class might have a result
+     * for the given `type`.
+     *
+     * The implementation of this predicate should not depend on `DataFlow::Node`.
+     */
+    bindingset[type]
+    predicate isTypeUsed(string type) { none() }
+
     /**
      * Gets a data-flow node that is a source of the given `type`.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * This must not depend on API graphs, but ensures that an API node is generated for
      * the source.
      */
@@ -180,6 +191,8 @@ module ModelInput {
      * Gets a data-flow node that is a sink of the given `type`,
      * usually because it is an argument passed to a parameter of that type.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * This must not depend on API graphs, but ensures that an API node is generated for
      * the sink.
      */
@@ -188,6 +201,8 @@ module ModelInput {
     /**
      * Gets an API node that is a source or sink of the given `type`.
      *
+     * Note that `type` should also be included in `isTypeUsed`.
+     *
      * Unlike `getASource` and `getASink`, this may depend on API graphs.
      */
     API::Node getAnApiNode(string type) { none() }
@@ -367,6 +382,8 @@ predicate isRelevantType(string type) {
   (
     Specific::isTypeUsed(type)
     or
+    any(TypeModel model).isTypeUsed(type)
+    or
     exists(TestAllModels t)
   )
   or

javascript/ql/test/library-tests/frameworks/data/test.expected

@@ -79,6 +79,7 @@ taintFlow
 | test.js:269:10:269:31 | this.ba ... ource() | test.js:269:10:269:31 | this.ba ... ource() |
 | test.js:272:6:272:40 | new MyS ... ource() | test.js:272:6:272:40 | new MyS ... ource() |
 | test.js:274:6:274:39 | testlib ... eName() | test.js:274:6:274:39 | testlib ... eName() |
+| test.js:277:8:277:31 | "danger ... .danger | test.js:277:8:277:31 | "danger ... .danger |
 isSink
 | test.js:54:18:54:25 | source() | test-sink |
 | test.js:55:22:55:29 | source() | test-sink |

javascript/ql/test/library-tests/frameworks/data/test.ext.yml

@@ -11,6 +11,7 @@ extensions:
       - ['testlib', 'Member[ParamDecoratorSource].DecoratedParameter', 'test-source']
       - ['testlib', 'Member[getSource].ReturnValue', 'test-source']
       - ['(testlib)', 'Member[parenthesizedPackageName].ReturnValue', 'test-source']
+      - ['danger-constant', 'Member[danger]', 'test-source']
 
   - addsTo:
       pack: codeql/javascript-all

javascript/ql/test/library-tests/frameworks/data/test.js

@@ -272,3 +272,9 @@ class MySubclass2 extends MySubclass {
 sink(new MySubclass2().baseclassSource()); // NOT OK
 
 sink(testlib.parenthesizedPackageName()); // NOT OK
+
+function dangerConstant() {
+  sink("danger-constant".danger); // NOT OK
+  sink("danger-constant".safe); // OK
+  sink("danger-constant"); // OK
+}

javascript/ql/test/library-tests/frameworks/data/test.ql

@@ -2,6 +2,15 @@ import javascript
 import testUtilities.ConsistencyChecking
 import semmle.javascript.frameworks.data.internal.ApiGraphModels as ApiGraphModels
 
+class TypeModelFromCodeQL extends ModelInput::TypeModel {
+  override predicate isTypeUsed(string type) { type = "danger-constant" }
+
+  override DataFlow::Node getASource(string type) {
+    type = "danger-constant" and
+    result.getStringValue() = "danger-constant"
+  }
+}
+
 class BasicTaintTracking extends TaintTracking::Configuration {
   BasicTaintTracking() { this = "BasicTaintTracking" }