Revert "JS: Recognize DomSanitizer from @angular/core"

This reverts commit ff1d0cc4c7.

benjamin-button.md

@@ -0,0 +1,51 @@
+# benjamin-buttons.md
+
+This file describes the changes that have been applied to
+the library to make it behave as if it was younger.
+
+## TaintedPath.ql
+
+Sinks added between 2020-01-01 and 2020-10-06 have been removed. Found by looking at:
+
+- the commit titles of https://github.com/github/codeql/commits/main/javascript/ql/test/query-tests/Security/CWE-022/TaintedPath/TaintedPath.expected
+- the PR titles of https://github.com/github/codeql/pulls?page=2&q=is%3Apr+label%3AJS+is%3Aclosed+sink
+
+Sinks added between 2018-08-02 and 2020-01-01 have been removed. Found by looking at:
+
+- the commit titles of https://github.com/github/codeql/commits/main/javascript/ql/test/query-tests/Security/CWE-022/TaintedPath/TaintedPath.expected
+- the PR titles of https://github.com/github/codeql/pulls?page=2&q=is%3Apr+label%3AJS+is%3Aclosed+sink
+- the PR titles of https://github.com/github/codeql/pulls?page=2&q=is%3Apr+label%3AJS+is%3Aclosed+pathinjection
+- the PR titles of https://github.com/github/codeql/pulls?page=2&q=is%3Apr+label%3AJS+is%3Aclosed+tainted-path
+
+Sinks from the "graceful-fs" and "fs-extra" (added before the open-sourcing squash).
+
+## Xss.ql
+
+Sinks added between 2020-01-01 and 2020-10-06 have been removed. Found by looking at:
+
+- the commit titles of https://github.com/github/codeql/commits/main/javascript/ql/test/query-tests/Security/CWE-079/Xss.expected
+- the PR titles of https://github.com/github/codeql/pulls?page=2&q=is%3Apr+label%3AJS+is%3Aclosed+sink
+
+- recursive type tracking for `jQuery::dollar`, `DOM::domValueRef`.
+
+## SqlInjection.ql
+
+Sinks added between 2020-01-01 and 2020-10-06 have been removed. Found by looking at:
+
+- the commit titles of https://github.com/github/codeql/commits/main/javascript/ql/test/query-tests/Security/CWE-089
+- the PR titles of https://github.com/github/codeql/pulls?page=2&q=is%3Apr+label%3AJS+is%3Aclosed+sink
+
+Sinks added between 2018-08-02 and 2020-01-01 have been removed. Found by looking at:
+
+- the commit titles of https://github.com/github/codeql/commits/main/javascript/ql/test/query-tests/Security/CWE-089
+- the PR titles of https://github.com/github/codeql/pulls?page=2&q=is%3Apr+label%3AJS+is%3Aclosed+sink
+- the PR titles of https://github.com/github/codeql/pulls?page=2&q=is%3Apr+label%3AJS+is%3Aclosed+sql
+
+TypeTracking in SQL.qll (added before the open-sourcing squash)
+
+The model of `mssql` and `sequelize` (added before the open-sourcing squash)
+
+## PseudoProperties
+
+Pseudo-properties (`$name$`) used in type-tracking and global dataflow configurations have been disabled.
+Found by searching for `"\$.*\$"`.

javascript/ql/experimental/adaptivethreatmodeling/lib/experimental/adaptivethreatmodeling/CodeToFeatures.qll

@@ -4,6 +4,8 @@
  * Extracts data about the functions in the database for use in adaptive threat modeling (ATM).
  */
 
+private import EndpointFeatures::NeighborhoodBodies
+
 module Raw {
   private import javascript as raw
 
@@ -30,6 +32,9 @@ module Raw {
     entity.getNumBodyStmt() = 0 and not exists(entity.getAReturnedExpr())
   }
 
+  /**
+   * Wrapper for RawAstNode (could be an alias instead of a newtype)
+   */
   newtype WrappedAstNode = TAstNode(RawAstNode rawNode)
 
   /**
@@ -44,6 +49,10 @@ module Raw {
 
     AstNode getParentNode() { result = TAstNode(rawNode.getParent()) }
 
+    raw::ASTNode getNode() { result = rawNode }
+
+    raw::StmtContainer getContainer() { result = rawNode.getContainer() }
+
     /**
      * Holds if the AST node has `result` as its `index`th attribute.
      *
@@ -128,6 +137,11 @@ module Raw {
     }
   }
 
+  /**
+   * Returns the `Raw::AstNode` wrapper of `rawNode`
+   */
+  AstNode astNode(RawAstNode rawNode) { result = TAstNode(rawNode) }
+
   /**
    * Holds if `result` is the `index`'th child of the `parent` entity. Such
    * a node is a root of an AST associated with this entity.
@@ -324,6 +338,11 @@ module Wrapped {
     Raw::Location getLocation() { result = rawNode.getLocation() }
   }
 
+  /**
+   * Returns the `Wrapped::AstNode` for a `rawNode` in the context of `entity`
+   */
+  AstNode astNode(Raw::Entity entity, Raw::AstNode rawNode) { result = TAstNode(entity, rawNode) }
+
   /**
    * A synthetic AST node, created to be a leaf for an otherwise non-leaf attribute.
    */
@@ -383,6 +402,8 @@ module DatabaseFeatures {
     override Location getLocation() { result = entity.getLocation() }
 
     UnderlyingFunction getDefinedFunction() { result = entity.getDefinedFunction() }
+
+    Wrapped::Entity getWrappedEntity() { result = entity }
   }
 
   class AstNode extends EntityOrAstNode, TAstNode {
@@ -392,8 +413,12 @@ module DatabaseFeatures {
 
     AstNode getChild(int index) { result = TAstNode(rawNode.getChild(index)) }
 
+    AstNode getAChild() { result = this.getChild(_) }
+
     string getAttribute(int index) { result = rawNode.getAttribute(index) }
 
+    Wrapped::AstNode getRawNode() { result = rawNode }
+
     override string getType() { result = rawNode.getType() }
 
     override string toString() { result = this.getType() }
@@ -401,6 +426,9 @@ module DatabaseFeatures {
     override Location getLocation() { result = rawNode.getLocation() }
   }
 
+  /** Gets the `DatabaseFeatures::AstNode` that wraps `wrapped` */
+  AstNode astNode(Wrapped::AstNode wrapped) { result.getRawNode() = wrapped }
+
   /** Consistency checks: these predicates should each have no results */
   module Consistency {
     query predicate nonLeafAttribute(AstNode node, int index, string attribute) {
@@ -423,15 +451,15 @@ module DatabaseFeatures {
   }
 
   query predicate astNodes(
-    Entity enclosingEntity, EntityOrAstNode parent, int index, AstNode node, string node_type
+    Entity enclosingEntity, EntityOrAstNode parent, int index, AstNode child, string childType
   ) {
-    node = enclosingEntity.getAstRoot(index) and
+    child = enclosingEntity.getAstRoot(index) and
     parent = enclosingEntity and
-    node_type = node.getType()
+    childType = child.getType()
     or
     astNodes(enclosingEntity, _, _, parent, _) and
-    node = parent.(AstNode).getChild(index) and
-    node_type = node.getType()
+    child = parent.(AstNode).getChild(index) and
+    childType = child.getType()
   }
 
   query predicate nodeAttributes(AstNode node, string attr) {

javascript/ql/experimental/adaptivethreatmodeling/lib/experimental/adaptivethreatmodeling/EndpointFeatures.qll

@@ -8,6 +8,12 @@ import javascript
 import CodeToFeatures
 import EndpointScoring
 
+/** Maximum number of descendants of an AST node to be considered to be in the "neighborhood" of that node */
+private int maxNumDescendants() { result = 128 }
+
+/** Maximum number of subtokens in a function body */
+private int maxNumBodySubtokens() { result = 256 }
+
 /**
  * Gets the value of the token-based feature named `featureName` for the endpoint `endpoint`.
  *
@@ -25,6 +31,19 @@ private string getTokenFeature(DataFlow::Node endpoint, string featureName) {
     result = unique(string x | x = FunctionBodies::getBodyTokenFeatureForEntity(entity))
   )
   or
+  // A feature containing natural language tokens from the neighborhood around the endpoint
+  // (limited to within the function that encloses the endpoint), in the order they appear
+  // in the source code.
+  exists(Raw::AstNode rootNode, DatabaseFeatures::AstNode rootNodeWrapped |
+    featureName = "neighborhoodBody" and
+    rootNode = NeighborhoodBodies::getNeighborhoodAstNode(Raw::astNode(endpoint.getAstNode())) and
+    rootNodeWrapped = DatabaseFeatures::astNode(Wrapped::astNode(endpoint.getContainer(), rootNode)) and
+    result =
+      unique(string x |
+        x = NeighborhoodBodies::getBodyTokenFeatureForNeighborhoodNode(rootNodeWrapped)
+      )
+  )
+  or
   exists(getACallBasedTokenFeatureComponent(endpoint, _, featureName)) and
   result =
     concat(DataFlow::CallNode call, string component |
@@ -121,13 +140,17 @@ module FunctionBodies {
   /**
    * Gets the body token feature for the specified entity.
    *
-   * This is a string containing natural language tokens in the order that they appear in the source code for the entity.
+   * This is a string containing natural language tokens in the order that they appear in the source
+   * code for the entity.
+   *
+   * If a function has more than `maxNumBodySubtokens` body subtokens, then featurize it as absent.
+   * This approximates the behavior of the classifer on non-generic body features where large body
+   * features are replaced by the absent token.
    */
   string getBodyTokenFeatureForEntity(DatabaseFeatures::Entity entity) {
-    // If a function has more than 256 body subtokens, then featurize it as absent. This
-    // approximates the behavior of the classifer on non-generic body features where large body
-    // features are replaced by the absent token.
-    if count(DatabaseFeatures::AstNode node, string token | bodyTokens(entity, node, token)) > 256
+    if
+      count(DatabaseFeatures::AstNode node, string token | bodyTokens(entity, node, token)) >
+        maxNumBodySubtokens()
     then result = ""
     else
       result =
@@ -147,6 +170,88 @@ module FunctionBodies {
   }
 }
 
+/**
+ * This module provides functionality for getting the local neighborhood around an AST node within
+ * its enclosing function body, providing a locally-scoped version of the `enclosingFunctionBody` feature.
+ */
+module NeighborhoodBodies {
+  /**
+   * Return the ancestor of the input AST node that has the largest number of descendants (i.e. the
+   * node nearest the root) but has no more than `maxNumDescendants` descendants.
+   *
+   * TODO: Maybe instead of a threshold on number of descendants, we should instead have a threshold
+   * on the number of leaves in the subtree, which is a closer approximation to the number of tokens
+   * in the subtree.
+   */
+  Raw::AstNode getNeighborhoodAstNode(Raw::AstNode node) {
+    if
+      // `node` will always have a parent as we start at and endpoint
+      node.getParentNode() = getOutermostEnclosingFunction(node) or
+      getNumDescendents(node.getParentNode()) > maxNumDescendants()
+    then result = node
+    else result = getNeighborhoodAstNode(node.getParentNode())
+  }
+
+  /** Count number of descendants of an AST node */
+  int getNumDescendents(Raw::AstNode node) { result = count(node.getAChildNode*()) }
+
+  private ASTNode getContainer(ASTNode node) {
+    result = node.getContainer()
+  }
+
+  /** Return the AST node that is outermost enclosing function (as an AST Node) */
+  Raw::AstNode getOutermostEnclosingFunction(Raw::AstNode node) {
+    result = Raw::astNode(getContainer*(node.getNode())) and result.getContainer() instanceof TopLevel
+  }
+
+  /**
+   * Holds if `childNode` is an AST node under `rootNode` and `token` is a node attribute associated
+   * with `childNode`. Note that only AST leaves have node attributes.
+   *
+   * TODO we may need to restrict `rootNode` to be a neighborhood root to avoid a potentially big result set.
+   */
+  private predicate bodyTokens(
+    DatabaseFeatures::AstNode rootNode, DatabaseFeatures::AstNode childNode, string token
+  ) {
+    childNode = rootNode.getAChild*() and
+    token = unique(string t | DatabaseFeatures::nodeAttributes(childNode, t))
+  }
+
+  /**
+   * Gets the body token feature limited to the part of the function body that lies under `rootNode` in the AST.
+   *
+   * This is a string of space-separated natural language tokens (AST leaves) in the order that they
+   * appear in the source code for the AST subtree rooted at `rootNode`. This is equivalent to the
+   * portion of the code that falls under the AST subtree rooted at the given node, except that
+   * non-leaf nodes (such as operators) are excluded.
+   *
+   * If a function has more than `maxNumBodySubtokens` body subtokens, then featurize it as absent.
+   * This approximates the behavior of the classifer on non-generic body features where large body
+   * features are replaced by the absent token.
+   */
+  string getBodyTokenFeatureForNeighborhoodNode(DatabaseFeatures::AstNode rootNode) {
+    if
+      count(DatabaseFeatures::AstNode node, string token | bodyTokens(rootNode, node, token)) >
+        maxNumBodySubtokens()
+    then result = ""
+    else
+      result =
+        concat(int i, string rankedToken |
+          rankedToken =
+            rank[i](DatabaseFeatures::AstNode node, string token, Location l |
+              bodyTokens(rootNode, node, token) and l = node.getLocation()
+            |
+              token
+              order by
+                l.getFile().getAbsolutePath(), l.getStartLine(), l.getStartColumn(), l.getEndLine(),
+                l.getEndColumn(), token
+            )
+        |
+          rankedToken, " " order by i
+        )
+  }
+}
+
 /**
  * This module provides functionality for getting a representation of the access path of nodes
  * within the program.
@@ -191,7 +296,10 @@ private module AccessPaths {
     Boolean() { this = true or this = false }
   }
 
-  /** Get the access path for the node. This includes structural information like `member`, `param`, and `functionalarg` if `includeStructuralInfo` is true. */
+  /**
+  * Get the access path for the node. This includes structural information like `member`, `param`,
+  * and `functionalarg` if `includeStructuralInfo` is true.
+  */
   predicate accessPaths(
     API::Node node, Boolean includeStructuralInfo, string accessPath, string apiName
   ) {
@@ -269,7 +377,8 @@ private string getASupportedFeatureName() {
   result =
     [
       "enclosingFunctionName", "calleeName", "receiverName", "argumentIndex", "calleeApiName",
-      "calleeAccessPath", "calleeAccessPathWithStructuralInfo", "enclosingFunctionBody"
+      "calleeAccessPath", "calleeAccessPathWithStructuralInfo", "enclosingFunctionBody",
+      "neighborhoodBody"
     ]
 }
 

javascript/ql/lib/semmle/javascript/DOM.qll

@@ -359,35 +359,6 @@ module DOM {
           call.getNumArgument() = 1 and
           unique(InferredType t | t = getArgumentTypeFromJQueryMethodGet(call)) = TTNumber()
         )
-        or
-        // A `this` node from a callback given to a `$().each(callback)` call.
-        // purposely not using JQuery::MethodCall to avoid `jquery.each()`.
-        exists(DataFlow::CallNode eachCall | eachCall = JQuery::objectRef().getAMethodCall("each") |
-          this = DataFlow::thisNode(eachCall.getCallback(0).getFunction()) or
-          this = eachCall.getABoundCallbackParameter(0, 1)
-        )
-        or
-        // A read of an array-element from a JQuery object. E.g. `$("#foo")[0]`
-        exists(DataFlow::PropRead read |
-          read = this and read = JQuery::objectRef().getAPropertyRead()
-        |
-          unique(InferredType t | t = read.getPropertyNameExpr().analyze().getAType()) = TTNumber()
-        )
-        or
-        // A receiver node of an event handler on a DOM node
-        exists(DataFlow::SourceNode domNode, DataFlow::FunctionNode eventHandler |
-          // NOTE: we do not use `getABoundFunctionValue()`, since bound functions tend to have
-          // a different receiver anyway
-          eventHandler = domNode.getAPropertySource(any(string n | n.matches("on%")))
-          or
-          eventHandler =
-            domNode.getAMethodCall("addEventListener").getArgument(1).getAFunctionValue()
-        |
-          domNode = domValueRef() and
-          this = eventHandler.getReceiver()
-        )
-        or
-        this = DataFlow::thisNode(any(EventHandlerCode evt))
       }
     }
   }
@@ -421,11 +392,6 @@ module DOM {
     or
     t.start() and
     result = domValueRef().getAMethodCall(["item", "namedItem"])
-    or
-    t.startInProp("target") and
-    result = domEventSource()
-    or
-    exists(DataFlow::TypeTracker t2 | result = domValueRef(t2).track(t2, t))
   }
 
   /** Gets a data flow node that may refer to a value from the DOM. */

javascript/ql/lib/semmle/javascript/Promises.qll

@@ -185,12 +185,12 @@ module Promises {
   /**
    * Gets the pseudo-field used to describe resolved values in a promise.
    */
-  string valueProp() { result = "$PromiseResolveField$" }
+  string valueProp() { none() }
 
   /**
    * Gets the pseudo-field used to describe rejected values in a promise.
    */
-  string errorProp() { result = "$PromiseRejectField$" }
+  string errorProp() { none() }
 }
 
 /**

javascript/ql/lib/semmle/javascript/dataflow/Configuration.qll

@@ -777,10 +777,10 @@ private class AdditionalFlowStepAsSharedStep extends SharedFlowStep {
  */
 module PseudoProperties {
   bindingset[s]
-  private string pseudoProperty(string s) { result = "$" + s + "$" }
+  private string pseudoProperty(string s) { none() }
 
   bindingset[s, v]
-  private string pseudoProperty(string s, string v) { result = "$" + s + "|" + v + "$" }
+  private string pseudoProperty(string s, string v) { none() }
 
   /**
    * Gets a pseudo-property for the location of elements in a `Set`

javascript/ql/lib/semmle/javascript/frameworks/Angular2.qll

@@ -136,7 +136,7 @@ module Angular2 {
 
   /** Gets a reference to a `DomSanitizer` object. */
   DataFlow::SourceNode domSanitizer() {
-    result.hasUnderlyingType(["@angular/platform-browser", "@angular/core"], "DomSanitizer")
+    result.hasUnderlyingType("@angular/platform-browser", "DomSanitizer")
   }
 
   /** A value that is about to be promoted to a trusted HTML or CSS value. */

javascript/ql/lib/semmle/javascript/frameworks/Express.qll

@@ -864,28 +864,6 @@ module Express {
     override string getCredentialsKind() { result = kind }
   }
 
-  /** A call to `response.sendFile`, considered as a file system access. */
-  private class ResponseSendFileAsFileSystemAccess extends FileSystemReadAccess,
-    DataFlow::MethodCallNode {
-    ResponseSendFileAsFileSystemAccess() {
-      exists(string name | name = "sendFile" or name = "sendfile" |
-        calls(any(ResponseExpr res).flow(), name)
-      )
-    }
-
-    override DataFlow::Node getADataNode() { none() }
-
-    override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-    override DataFlow::Node getRootPathArgument() {
-      result = this.(DataFlow::CallNode).getOptionArgument(1, "root")
-    }
-
-    override predicate isUpwardNavigationRejected(DataFlow::Node argument) {
-      argument = getAPathArgument()
-    }
-  }
-
   /**
    * A function that flows to a route setup.
    */

javascript/ql/lib/semmle/javascript/frameworks/Files.qll

@@ -4,23 +4,6 @@
 
 import javascript
 
-/**
- * A call that can produce a file name.
- */
-abstract private class FileNameProducer extends DataFlow::Node {
-  /**
-   * Gets a file name produced by this producer.
-   */
-  abstract DataFlow::Node getAFileName();
-}
-
-/**
- * A node that contains a file name, and is produced by a `ProducesFileNames`.
- */
-private class ProducedFileName extends FileNameSource {
-  ProducedFileName() { this = any(FileNameProducer producer).getAFileName() }
-}
-
 /**
  * A file name from the `walk-sync` library.
  */
@@ -143,338 +126,3 @@ private DataFlow::Node fastGlobFileNameSource(DataFlow::TypeTracker t) {
 private class FastGlobFileNameSource extends FileNameSource {
   FastGlobFileNameSource() { this = fastGlobFileNameSource(DataFlow::TypeTracker::end()) }
 }
-
-/**
- * Classes and predicates for modelling the `fstream` library (https://www.npmjs.com/package/fstream).
- */
-private module FStream {
-  /**
-   * Gets a reference to a method in the `fstream` library.
-   */
-  private DataFlow::SourceNode getAnFStreamProperty(boolean writer) {
-    exists(DataFlow::SourceNode mod, string readOrWrite, string subMod |
-      mod = DataFlow::moduleImport("fstream") and
-      (
-        readOrWrite = "Reader" and writer = false
-        or
-        readOrWrite = "Writer" and writer = true
-      ) and
-      (subMod = "File" or subMod = "Dir" or subMod = "Link" or subMod = "Proxy")
-    |
-      result = mod.getAPropertyRead(readOrWrite) or
-      result = mod.getAPropertyRead(readOrWrite).getAPropertyRead(subMod) or
-      result = mod.getAPropertyRead(subMod).getAPropertyRead(readOrWrite)
-    )
-  }
-
-  /**
-   * An invocation of a method defined in the `fstream` library.
-   */
-  private class FStream extends FileSystemAccess, DataFlow::InvokeNode {
-    boolean writer;
-
-    FStream() { this = getAnFStreamProperty(writer).getAnInvocation() }
-
-    override DataFlow::Node getAPathArgument() {
-      result = getOptionArgument(0, "path")
-      or
-      not exists(getOptionArgument(0, "path")) and
-      result = getArgument(0)
-    }
-  }
-
-  /**
-   * An invocation of an `fstream` method that writes to a file.
-   */
-  private class FStreamWriter extends FileSystemWriteAccess, FStream {
-    FStreamWriter() { writer = true }
-
-    override DataFlow::Node getADataNode() { none() }
-  }
-
-  /**
-   * An invocation of an `fstream` method that reads a file.
-   */
-  private class FStreamReader extends FileSystemReadAccess, FStream {
-    FStreamReader() { writer = false }
-
-    override DataFlow::Node getADataNode() { none() }
-  }
-}
-
-/**
- * A call to the library `write-file-atomic`.
- */
-private class WriteFileAtomic extends FileSystemWriteAccess, DataFlow::CallNode {
-  WriteFileAtomic() {
-    this = DataFlow::moduleImport("write-file-atomic").getACall()
-    or
-    this = DataFlow::moduleMember("write-file-atomic", "sync").getACall()
-  }
-
-  override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-  override DataFlow::Node getADataNode() { result = getArgument(1) }
-}
-
-/**
- * A call to the library `recursive-readdir`.
- */
-private class RecursiveReadDir extends FileSystemAccess, FileNameProducer, DataFlow::CallNode {
-  RecursiveReadDir() { this = DataFlow::moduleImport("recursive-readdir").getACall() }
-
-  override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-  override DataFlow::Node getAFileName() { result = trackFileSource(DataFlow::TypeTracker::end()) }
-
-  private DataFlow::SourceNode trackFileSource(DataFlow::TypeTracker t) {
-    t.start() and result = getCallback([1 .. 2]).getParameter(1)
-    or
-    t.startInPromise() and not exists(getCallback([1 .. 2])) and result = this
-    or
-    // Tracking out of a promise
-    exists(DataFlow::TypeTracker t2 |
-      result = PromiseTypeTracking::promiseStep(trackFileSource(t2), t, t2)
-    )
-  }
-}
-
-/**
- * Classes and predicates for modelling the `jsonfile` library (https://www.npmjs.com/package/jsonfile).
- */
-private module JSONFile {
-  /**
-   * A reader for JSON files.
-   */
-  class JSONFileReader extends FileSystemReadAccess, DataFlow::CallNode {
-    JSONFileReader() {
-      this =
-        DataFlow::moduleMember("jsonfile", any(string s | s = "readFile" or s = "readFileSync"))
-            .getACall()
-    }
-
-    override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-    override DataFlow::Node getADataNode() { result = trackRead(DataFlow::TypeTracker::end()) }
-
-    private DataFlow::SourceNode trackRead(DataFlow::TypeTracker t) {
-      this.getCalleeName() = "readFile" and
-      (
-        t.start() and result = getCallback([1 .. 2]).getParameter(1)
-        or
-        t.startInPromise() and not exists(getCallback([1 .. 2])) and result = this
-      )
-      or
-      t.start() and
-      this.getCalleeName() = "readFileSync" and
-      result = this
-      or
-      // Tracking out of a promise
-      exists(DataFlow::TypeTracker t2 |
-        result = PromiseTypeTracking::promiseStep(trackRead(t2), t, t2)
-      )
-    }
-  }
-
-  /**
-   * A writer for JSON files.
-   */
-  class JSONFileWriter extends FileSystemWriteAccess, DataFlow::CallNode {
-    JSONFileWriter() {
-      this =
-        DataFlow::moduleMember("jsonfile", any(string s | s = "writeFile" or s = "writeFileSync"))
-            .getACall()
-    }
-
-    override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-    override DataFlow::Node getADataNode() { result = getArgument(1) }
-  }
-}
-
-/**
- * A call to the library `load-json-file`.
- */
-private class LoadJsonFile extends FileSystemReadAccess, DataFlow::CallNode {
-  LoadJsonFile() {
-    this = DataFlow::moduleImport("load-json-file").getACall()
-    or
-    this = DataFlow::moduleMember("load-json-file", "sync").getACall()
-  }
-
-  override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-  override DataFlow::Node getADataNode() { result = trackRead(DataFlow::TypeTracker::end()) }
-
-  private DataFlow::SourceNode trackRead(DataFlow::TypeTracker t) {
-    this.getCalleeName() = "sync" and t.start() and result = this
-    or
-    not this.getCalleeName() = "sync" and t.startInPromise() and result = this
-    or
-    // Tracking out of a promise
-    exists(DataFlow::TypeTracker t2 |
-      result = PromiseTypeTracking::promiseStep(trackRead(t2), t, t2)
-    )
-  }
-}
-
-/**
- * A call to the library `write-json-file`.
- */
-private class WriteJsonFile extends FileSystemWriteAccess, DataFlow::CallNode {
-  WriteJsonFile() {
-    this = DataFlow::moduleImport("write-json-file").getACall()
-    or
-    this = DataFlow::moduleMember("write-json-file", "sync").getACall()
-  }
-
-  override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-  override DataFlow::Node getADataNode() { result = getArgument(1) }
-}
-
-/**
- * A call to the library `walkdir`.
- */
-private class WalkDir extends FileNameProducer, FileSystemAccess, DataFlow::CallNode {
-  WalkDir() {
-    this = DataFlow::moduleImport("walkdir").getACall()
-    or
-    this = DataFlow::moduleMember("walkdir", "sync").getACall()
-    or
-    this = DataFlow::moduleMember("walkdir", "async").getACall()
-  }
-
-  override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-  override DataFlow::Node getAFileName() { result = trackFileSource(DataFlow::TypeTracker::end()) }
-
-  private DataFlow::SourceNode trackFileSource(DataFlow::TypeTracker t) {
-    not this.getCalleeName() = any(string s | s = "sync" or s = "async") and
-    t.start() and
-    (
-      result = getCallback(getNumArgument() - 1).getParameter(0)
-      or
-      result = getAMethodCall(EventEmitter::on()).getCallback(1).getParameter(0)
-    )
-    or
-    t.start() and this.getCalleeName() = "sync" and result = this
-    or
-    t.startInPromise() and this.getCalleeName() = "async" and result = this
-    or
-    // Tracking out of a promise
-    exists(DataFlow::TypeTracker t2 |
-      result = PromiseTypeTracking::promiseStep(trackFileSource(t2), t, t2)
-    )
-  }
-}
-
-/**
- * A call to the library `globule`.
- */
-private class Globule extends FileNameProducer, FileSystemAccess, DataFlow::CallNode {
-  Globule() {
-    this = DataFlow::moduleMember("globule", "find").getACall()
-    or
-    this = DataFlow::moduleMember("globule", "match").getACall()
-    or
-    this = DataFlow::moduleMember("globule", "isMatch").getACall()
-    or
-    this = DataFlow::moduleMember("globule", "mapping").getACall()
-    or
-    this = DataFlow::moduleMember("globule", "findMapping").getACall()
-  }
-
-  override DataFlow::Node getAPathArgument() {
-    (this.getCalleeName() = "match" or this.getCalleeName() = "isMatch") and
-    result = getArgument(1)
-    or
-    this.getCalleeName() = "mapping" and
-    (
-      result = getAnArgument() and not exists(result.getALocalSource().getAPropertyWrite("src"))
-      or
-      result = getAnArgument().getALocalSource().getAPropertyWrite("src").getRhs()
-    )
-  }
-
-  override DataFlow::Node getAFileName() {
-    result = this and
-    (
-      this.getCalleeName() = "find" or
-      this.getCalleeName() = "match" or
-      this.getCalleeName() = "findMapping" or
-      this.getCalleeName() = "mapping"
-    )
-  }
-}
-
-/**
- * A file system access made by a NodeJS library.
- * This class models multiple NodeJS libraries that access files.
- */
-private class LibraryAccess extends FileSystemAccess, DataFlow::InvokeNode {
-  int pathArgument; // The index of the path argument.
-
-  LibraryAccess() {
-    pathArgument = 0 and
-    (
-      this = DataFlow::moduleImport("path-exists").getACall()
-      or
-      this = DataFlow::moduleImport("rimraf").getACall()
-      or
-      this = DataFlow::moduleImport("readdirp").getACall()
-      or
-      this = DataFlow::moduleImport("walker").getACall()
-      or
-      this =
-        DataFlow::moduleMember("node-dir",
-          any(string s |
-            s = ["readFiles", "readFilesStream", "files", "promiseFiles", "subdirs", "paths"]
-          )).getACall()
-    )
-    or
-    pathArgument = 0 and
-    this =
-      DataFlow::moduleMember("vinyl-fs", any(string s | s = "src" or s = "dest" or s = "symlink"))
-          .getACall()
-    or
-    pathArgument = [0 .. 1] and
-    (
-      this = DataFlow::moduleImport("ncp").getACall() or
-      this = DataFlow::moduleMember("ncp", "ncp").getACall()
-    )
-  }
-
-  override DataFlow::Node getAPathArgument() { result = getArgument(pathArgument) }
-}
-
-/**
- * A call to the library [`chokidar`](https://www.npmjs.com/package/chokidar), where a call to `on` receives file names.
- */
-class Chokidar extends FileNameProducer, FileSystemAccess, API::CallNode {
-  Chokidar() { this = API::moduleImport("chokidar").getMember("watch").getACall() }
-
-  override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-
-  override DataFlow::Node getAFileName() {
-    exists(DataFlow::CallNode onCall, int pathIndex |
-      onCall = getAChainedMethodCall("on") and
-      if onCall.getArgument(0).mayHaveStringValue("all") then pathIndex = 1 else pathIndex = 0
-    |
-      result = onCall.getCallback(1).getParameter(pathIndex)
-    )
-  }
-}
-
-/**
- * A call to the [`mkdirp`](https://www.npmjs.com/package/mkdirp) library.
- */
-private class Mkdirp extends FileSystemAccess, API::CallNode {
-  Mkdirp() {
-    this = API::moduleImport("mkdirp").getACall()
-    or
-    this = API::moduleImport("mkdirp").getMember("sync").getACall()
-  }
-
-  override DataFlow::Node getAPathArgument() { result = getArgument(0) }
-}

javascript/ql/lib/semmle/javascript/frameworks/NoSQL.qll

@@ -6,146 +6,120 @@ import javascript
 
 module NoSQL {
   /** An expression that is interpreted as a NoSQL query. */
-  abstract class Query extends Expr {
-    /** Gets an expression that is interpreted as a code operator in this query. */
-    DataFlow::Node getACodeOperator() { none() }
-  }
-}
-
-/**
- * Gets a value that has been assigned to the "$where" property of an object that flows to `queryArg`.
- */
-private DataFlow::Node getADollarWhereProperty(API::Node queryArg) {
-  result = queryArg.getMember("$where").getARhs()
+  abstract class Query extends Expr { }
 }
 
 /**
  * Provides classes modeling the MongoDB library.
  */
 private module MongoDB {
+  /**
+   * Gets an import of MongoDB.
+   */
+  DataFlow::ModuleImportNode mongodb() { result.getPath() = "mongodb" }
+
   /**
    * Gets an access to `mongodb.MongoClient`.
    */
-  private API::Node getAMongoClient() {
-    result = API::moduleImport("mongodb").getMember("MongoClient")
+  private DataFlow::SourceNode getAMongoClient(DataFlow::TypeTracker t) {
+    t.start() and
+    result = mongodb().getAPropertyRead("MongoClient")
     or
-    result = getAMongoDbCallback().getParameter(1) and
-    not result.getAnImmediateUse().(DataFlow::ParameterNode).getName() = "db" // mongodb v2 provides a `Db` here
-  }
-
-  /** Gets an API-graph node that refers to a `connect` callback. */
-  private API::Node getAMongoDbCallback() {
-    result = getAMongoClient().getMember("connect").getLastParameter()
+    exists(DataFlow::TypeTracker t2 | result = getAMongoClient(t2).track(t2, t))
   }
 
   /**
-   * Gets an API-graph node that may refer to a MongoDB database connection.
+   * Gets an access to `mongodb.MongoClient`.
    */
-  private API::Node getAMongoDb() {
-    result = getAMongoClient().getMember("db").getReturn()
+  DataFlow::SourceNode getAMongoClient() { result = getAMongoClient(DataFlow::TypeTracker::end()) }
+
+  /** Gets a data flow node that leads to a `connect` callback. */
+  private DataFlow::SourceNode getAMongoDbCallback(DataFlow::TypeBackTracker t) {
+    t.start() and
+    result = getAMongoClient().getAMemberCall("connect").getArgument(1).getALocalSource()
     or
-    result = getAMongoDbCallback().getParameter(1) and
-    not result.getAnImmediateUse().(DataFlow::ParameterNode).getName() = "client" // mongodb v3 provides a `Mongoclient` here
+    exists(DataFlow::TypeBackTracker t2 | result = getAMongoDbCallback(t2).backtrack(t2, t))
+  }
+
+  /** Gets a data flow node that leads to a `connect` callback. */
+  private DataFlow::FunctionNode getAMongoDbCallback() {
+    result = getAMongoDbCallback(DataFlow::TypeBackTracker::end())
+  }
+
+  /**
+   * Gets an expression that may refer to a MongoDB database connection.
+   */
+  private DataFlow::SourceNode getAMongoDb(DataFlow::TypeTracker t) {
+    t.start() and
+    result = getAMongoDbCallback().getParameter(1)
+    or
+    exists(DataFlow::TypeTracker t2 | result = getAMongoDb(t2).track(t2, t))
+  }
+
+  /**
+   * Gets an expression that may refer to a MongoDB database connection.
+   */
+  DataFlow::SourceNode getAMongoDb() { result = getAMongoDb(DataFlow::TypeTracker::end()) }
+
+  /**
+   * A data flow node that may hold a MongoDB collection.
+   */
+  abstract class Collection extends DataFlow::SourceNode { }
+
+  /**
+   * A collection resulting from calling `Db.collection(...)`.
+   */
+  private class CollectionFromDb extends Collection {
+    CollectionFromDb() {
+      this = getAMongoDb().getAMethodCall("collection")
+      or
+      this = getAMongoDb().getAMethodCall("collection").getCallback(1).getParameter(0)
+    }
+  }
+
+  /**
+   * A collection based on the type `mongodb.Collection`.
+   *
+   * Note that this also covers `mongoose` models since they are subtypes
+   * of `mongodb.Collection`.
+   */
+  private class CollectionFromType extends Collection {
+    CollectionFromType() { hasUnderlyingType("mongodb", "Collection") }
   }
 
   /** Gets a data flow node referring to a MongoDB collection. */
-  private API::Node getACollection() {
-    // A collection resulting from calling `Db.collection(...)`.
-    exists(API::Node collection | collection = getAMongoDb().getMember("collection").getReturn() |
-      result = collection
-      or
-      result = collection.getParameter(1).getParameter(0)
-    )
+  private DataFlow::SourceNode getACollection(DataFlow::TypeTracker t) {
+    t.start() and
+    result instanceof Collection
     or
-    // note that this also covers `mongoose` models since they are subtypes of `mongodb.Collection`
-    result = API::Node::ofType("mongodb", "Collection")
+    exists(DataFlow::TypeTracker t2 | result = getACollection(t2).track(t2, t))
   }
 
+  /** Gets a data flow node referring to a MongoDB collection. */
+  DataFlow::SourceNode getACollection() { result = getACollection(DataFlow::TypeTracker::end()) }
+
   /** A call to a MongoDB query method. */
-  private class QueryCall extends DatabaseAccess, API::CallNode {
+  private class QueryCall extends DatabaseAccess, DataFlow::MethodCallNode {
     int queryArgIdx;
 
     QueryCall() {
-      exists(string method |
-        CollectionMethodSignatures::interpretsArgumentAsQuery(method, queryArgIdx) and
-        this = getACollection().getMember(method).getACall()
+      exists(string m | this = getACollection().getAMethodCall(m) |
+        m = "count" and queryArgIdx = 0
+        or
+        m = "distinct" and queryArgIdx = 1
+        or
+        m = "find" and queryArgIdx = 0
       )
     }
 
     override DataFlow::Node getAQueryArgument() { result = getArgument(queryArgIdx) }
-
-    DataFlow::Node getACodeOperator() {
-      result = getADollarWhereProperty(getParameter(queryArgIdx))
-    }
   }
 
   /**
    * An expression that is interpreted as a MongoDB query.
    */
   class Query extends NoSQL::Query {
-    QueryCall qc;
-
-    Query() { this = qc.getAQueryArgument().asExpr() }
-
-    override DataFlow::Node getACodeOperator() { result = qc.getACodeOperator() }
-  }
-
-  /**
-   * Provides signatures for the Collection methods.
-   */
-  module CollectionMethodSignatures {
-    /**
-     * Holds if Collection method `name` interprets parameter `n` as a query.
-     */
-    predicate interpretsArgumentAsQuery(string name, int n) {
-      // FilterQuery
-      (
-        name = "aggregate" and n = 0
-        or
-        name = "count" and n = 0
-        or
-        name = "countDocuments" and n = 0
-        or
-        name = "deleteMany" and n = 0
-        or
-        name = "deleteOne" and n = 0
-        or
-        name = "distinct" and n = 1
-        or
-        name = "find" and n = 0
-        or
-        name = "findOne" and n = 0
-        or
-        name = "findOneAndDelete" and n = 0
-        or
-        name = "findOneAndRemove" and n = 0
-        or
-        name = "findOneAndReplace" and n = 0
-        or
-        name = "findOneAndUpdate" and n = 0
-        or
-        name = "remove" and n = 0
-        or
-        name = "replaceOne" and n = 0
-        or
-        name = "update" and n = 0
-        or
-        name = "updateMany" and n = 0
-        or
-        name = "updateOne" and n = 0
-      )
-      or
-      // UpdateQuery
-      (
-        name = "findOneAndUpdate" and n = 1
-        or
-        name = "update" and n = 1
-        or
-        name = "updateMany" and n = 1
-        or
-        name = "updateOne" and n = 1
-      )
-    }
+    Query() { this = any(QueryCall qc).getAQueryArgument().asExpr() }
   }
 }
 
@@ -156,345 +130,20 @@ private module Mongoose {
   /**
    * Gets an import of Mongoose.
    */
-  API::Node getAMongooseInstance() { result = API::moduleImport("mongoose") }
+  DataFlow::ModuleImportNode getAMongooseInstance() { result.getPath() = "mongoose" }
 
   /**
-   * Gets a reference to `mongoose.createConnection`.
+   * Gets a call to `mongoose.createConnection`.
    */
-  API::Node createConnection() { result = getAMongooseInstance().getMember("createConnection") }
-
-  /**
-   * A Mongoose function.
-   */
-  abstract private class MongooseFunction extends API::Node {
-    /**
-     * Gets the API-graph node for the result from this function (if the function returns a `Query`).
-     */
-    abstract API::Node getQueryReturn();
-
-    /**
-     * Holds if this function returns a `Query` that evaluates to one or
-     * more Documents (`asArray` is false if it evaluates to a single
-     * Document).
-     */
-    abstract predicate returnsDocumentQuery(boolean asArray);
-
-    /**
-     * Gets an argument that this function interprets as a query.
-     */
-    abstract API::Node getQueryArgument();
+  DataFlow::CallNode createConnection() {
+    result = getAMongooseInstance().getAMemberCall("createConnection")
   }
 
   /**
-   * Provides classes modeling the Mongoose Model class
+   * A Mongoose collection object.
    */
-  module Model {
-    private class ModelFunction extends MongooseFunction {
-      string methodName;
-
-      ModelFunction() { this = getModelObject().getMember(methodName) }
-
-      override API::Node getQueryReturn() {
-        MethodSignatures::returnsQuery(methodName) and result = this.getReturn()
-      }
-
-      override predicate returnsDocumentQuery(boolean asArray) {
-        MethodSignatures::returnsDocumentQuery(methodName, asArray)
-      }
-
-      override API::Node getQueryArgument() {
-        exists(int n |
-          MethodSignatures::interpretsArgumentAsQuery(methodName, n) and
-          result = this.getParameter(n)
-        )
-      }
-    }
-
-    /**
-     * Gets a API-graph node referring to a Mongoose Model object.
-     */
-    private API::Node getModelObject() {
-      result = getAMongooseInstance().getMember("model").getReturn()
-      or
-      exists(API::Node conn | conn = createConnection().getReturn() |
-        result = conn.getMember("model").getReturn() or
-        result = conn.getMember("models").getAMember()
-      )
-      or
-      result = API::Node::ofType("mongoose", "Model")
-    }
-
-    /**
-     * Provides signatures for the Model methods.
-     */
-    module MethodSignatures {
-      /**
-       * Holds if Model method `name` interprets parameter `n` as a query.
-       */
-      predicate interpretsArgumentAsQuery(string name, int n) {
-        // implement lots of the MongoDB collection interface
-        MongoDB::CollectionMethodSignatures::interpretsArgumentAsQuery(name, n)
-        or
-        name = "find" + ["ById", "One"] + "AndUpdate" and n = 1
-        or
-        name in ["delete" + ["Many", "One"], "geoSearch", "remove", "replaceOne", "where"] and
-        n = 0
-        or
-        name in [
-            "find" + ["", "ById", "One"],
-            "find" + ["ById", "One"] + "And" + ["Delete", "Remove", "Update"],
-            "update" + ["", "Many", "One"]
-          ] and
-        n = 0
-      }
-
-      /**
-       * Holds if Model method `name` returns a Query.
-       */
-      predicate returnsQuery(string name) {
-        name =
-          [
-            "$where", "count", "findOne", "findOneAndDelete", "findOneAndRemove",
-            "findOneAndReplace", "findOneAndUpdate", "geosearch", "remove", "replaceOne", "update",
-            "updateMany", "countDocuments", "updateOne", "where", "deleteMany", "deleteOne", "find",
-            "findById", "findByIdAndDelete", "findByIdAndRemove", "findByIdAndUpdate"
-          ]
-      }
-
-      /**
-       * Holds if Document method `name` returns a query that results in
-       * one or more documents, the documents are wrapped in an array
-       * if `asArray` is true.
-       */
-      predicate returnsDocumentQuery(string name, boolean asArray) {
-        asArray = false and name = "findOne"
-        or
-        asArray = true and name = "find"
-      }
-    }
-  }
-
-  /**
-   * Provides classes modeling the Mongoose Query class
-   */
-  module Query {
-    private class QueryFunction extends MongooseFunction {
-      string methodName;
-
-      QueryFunction() { this = getAMongooseQuery().getMember(methodName) }
-
-      override API::Node getQueryReturn() {
-        MethodSignatures::returnsQuery(methodName) and result = this.getReturn()
-      }
-
-      override predicate returnsDocumentQuery(boolean asArray) {
-        MethodSignatures::returnsDocumentQuery(methodName, asArray)
-      }
-
-      override API::Node getQueryArgument() {
-        exists(int n |
-          MethodSignatures::interpretsArgumentAsQuery(methodName, n) and
-          result = this.getParameter(n)
-        )
-      }
-    }
-
-    private class NewQueryFunction extends MongooseFunction {
-      NewQueryFunction() { this = getAMongooseInstance().getMember("Query") }
-
-      override API::Node getQueryReturn() { result = this.getInstance() }
-
-      override predicate returnsDocumentQuery(boolean asArray) { none() }
-
-      override API::Node getQueryArgument() { result = this.getParameter(2) }
-    }
-
-    /**
-     * Gets a data flow node referring to a Mongoose query object.
-     */
-    API::Node getAMongooseQuery() {
-      result = any(MongooseFunction f).getQueryReturn()
-      or
-      result = API::Node::ofType("mongoose", "Query")
-      or
-      result =
-        getAMongooseQuery()
-            .getMember(any(string name | MethodSignatures::returnsQuery(name)))
-            .getReturn()
-    }
-
-    /**
-     * Provides signatures for the Query methods.
-     */
-    module MethodSignatures {
-      /**
-       * Holds if Query method `name` interprets parameter `n` as a query.
-       */
-      predicate interpretsArgumentAsQuery(string name, int n) {
-        n = 0 and
-        name =
-          [
-            "and", "count", "findOneAndReplace", "findOneAndUpdate", "merge", "nor", "or", "remove",
-            "replaceOne", "setQuery", "setUpdate", "update", "countDocuments", "updateMany",
-            "updateOne", "where", "deleteMany", "deleteOne", "elemMatch", "find", "findOne",
-            "findOneAndDelete", "findOneAndRemove"
-          ]
-        or
-        n = 1 and
-        name = ["distinct", "findOneAndUpdate", "update", "updateMany", "updateOne"]
-      }
-
-      /**
-       * Holds if Query method `name` returns a Query.
-       */
-      predicate returnsQuery(string name) {
-        name =
-          [
-            "$where", "J", "comment", "count", "countDocuments", "distinct", "elemMatch", "equals",
-            "error", "estimatedDocumentCount", "exists", "explain", "all", "find", "findById",
-            "findOne", "findOneAndRemove", "findOneAndUpdate", "geometry", "get", "gt", "gte",
-            "hint", "and", "in", "intersects", "lean", "limit", "lt", "lte", "map", "map",
-            "maxDistance", "maxTimeMS", "batchsize", "maxscan", "mod", "ne", "near", "nearSphere",
-            "nin", "or", "orFail", "polygon", "populate", "box", "read", "readConcern", "regexp",
-            "remove", "select", "session", "set", "setOptions", "setQuery", "setUpdate", "center",
-            "size", "skip", "slaveOk", "slice", "snapshot", "sort", "update", "w", "where",
-            "within", "centerSphere", "wtimeout", "circle", "collation"
-          ]
-      }
-
-      /**
-       * Holds if Query method `name` returns a query that results in
-       * one or more documents, the documents are wrapped in an array
-       * if `asArray` is true.
-       */
-      predicate returnsDocumentQuery(string name, boolean asArray) {
-        asArray = false and name = "findOne"
-        or
-        asArray = true and name = "find"
-      }
-    }
-  }
-
-  /**
-   * Provides classes modeling the Mongoose Document class
-   */
-  module Document {
-    private class DocumentFunction extends MongooseFunction {
-      string methodName;
-
-      DocumentFunction() { this = getAMongooseDocument().getMember(methodName) }
-
-      override API::Node getQueryReturn() {
-        MethodSignatures::returnsQuery(methodName) and result = this.getReturn()
-      }
-
-      override predicate returnsDocumentQuery(boolean asArray) {
-        MethodSignatures::returnsDocumentQuery(methodName, asArray)
-      }
-
-      override API::Node getQueryArgument() {
-        exists(int n |
-          MethodSignatures::interpretsArgumentAsQuery(methodName, n) and
-          result = this.getParameter(n)
-        )
-      }
-    }
-
-    /**
-     * A Mongoose Document that is retrieved from the backing database.
-     */
-    class RetrievedDocument extends API::Node {
-      RetrievedDocument() {
-        exists(boolean asArray, API::Node param |
-          exists(MongooseFunction func |
-            func.returnsDocumentQuery(asArray) and
-            param = func.getLastParameter().getParameter(1)
-          )
-          or
-          exists(API::Node f |
-            f = Query::getAMongooseQuery().getMember("then") and
-            param = f.getParameter(0).getParameter(0)
-            or
-            f = Query::getAMongooseQuery().getMember("exec") and
-            param = f.getParameter(0).getParameter(1)
-          |
-            exists(DataFlow::MethodCallNode pred |
-              // limitation: look at the previous method call	
-              Query::MethodSignatures::returnsDocumentQuery(pred.getMethodName(), asArray) and
-              pred.getAMethodCall() = f.getACall()
-            )
-          )
-        |
-          asArray = false and this = param
-          or
-          asArray = true and
-          // limitation: look for direct accesses
-          this = param.getUnknownMember()
-        )
-      }
-    }
-
-    /**
-     * Gets a data flow node referring to a Mongoose Document object.
-     */
-    private API::Node getAMongooseDocument() {
-      result instanceof RetrievedDocument
-      or
-      result = API::Node::ofType("mongoose", "Document")
-      or
-      result =
-        getAMongooseDocument()
-            .getMember(any(string name | MethodSignatures::returnsDocument(name)))
-            .getReturn()
-    }
-
-    private module MethodSignatures {
-      /**
-       * Holds if Document method `name` returns a Query.
-       */
-      predicate returnsQuery(string name) {
-        // Documents are subtypes of Models
-        Model::MethodSignatures::returnsQuery(name) or
-        name = "replaceOne" or
-        name = "update" or
-        name = "updateOne"
-      }
-
-      /**
-       * Holds if Document method `name` interprets parameter `n` as a query.
-       */
-      predicate interpretsArgumentAsQuery(string name, int n) {
-        // Documents are subtypes of Models
-        Model::MethodSignatures::interpretsArgumentAsQuery(name, n)
-        or
-        n = 0 and
-        (
-          name = "replaceOne" or
-          name = "update" or
-          name = "updateOne"
-        )
-      }
-
-      /**
-       * Holds if Document method `name` returns a query that results in
-       * one or more documents, the documents are wrapped in an array
-       * if `asArray` is true.
-       */
-      predicate returnsDocumentQuery(string name, boolean asArray) {
-        // Documents are subtypes of Models
-        Model::MethodSignatures::returnsDocumentQuery(name, asArray)
-      }
-
-      /**
-       * Holds if Document method `name` returns a Document.
-       */
-      predicate returnsDocument(string name) {
-        name = "depopulate" or
-        name = "init" or
-        name = "populate" or
-        name = "overwrite"
-      }
-    }
+  class Model extends MongoDB::Collection {
+    Model() { this = getAMongooseInstance().getAMemberCall("model") }
   }
 
   /**
@@ -504,9 +153,7 @@ private module Mongoose {
     string kind;
 
     Credentials() {
-      exists(string prop |
-        this = createConnection().getParameter(3).getMember(prop).getARhs().asExpr()
-      |
+      exists(string prop | this = createConnection().getOptionArgument(3, prop).asExpr() |
         prop = "user" and kind = "user name"
         or
         prop = "pass" and kind = "password"
@@ -515,222 +162,4 @@ private module Mongoose {
 
     override string getCredentialsKind() { result = kind }
   }
-
-  /**
-   * An expression that is interpreted as a (part of a) MongoDB query.
-   */
-  class MongoDBQueryPart extends NoSQL::Query {
-    MongooseFunction f;
-
-    MongoDBQueryPart() { this = f.getQueryArgument().getARhs().asExpr() }
-
-    override DataFlow::Node getACodeOperator() {
-      result = getADollarWhereProperty(f.getQueryArgument())
-    }
-  }
-
-  /**
-   * An evaluation of a MongoDB query.
-   */
-  class ShorthandQueryEvaluation extends DatabaseAccess, DataFlow::InvokeNode {
-    MongooseFunction f;
-
-    ShorthandQueryEvaluation() {
-      this = f.getACall() and
-      // shorthand for execution: provide a callback
-      exists(f.getQueryReturn()) and
-      exists(this.getCallback(this.getNumArgument() - 1))
-    }
-
-    override DataFlow::Node getAQueryArgument() {
-      // NB: the complete information is not easily accessible for deeply chained calls
-      f.getQueryArgument().getARhs() = result
-    }
-  }
-
-  class ExplicitQueryEvaluation extends DatabaseAccess {
-    ExplicitQueryEvaluation() {
-      // explicit execution using a Query method call
-      Query::getAMongooseQuery().getMember(["exec", "then", "catch"]).getACall() = this
-    }
-
-    override DataFlow::Node getAQueryArgument() {
-      // NB: the complete information is not easily accessible for deeply chained calls
-      none()
-    }
-  }
-}
-
-/**
- * Provides classes modeling the Minimongo library.
- */
-private module Minimongo {
-  /**
-   * Provides signatures for the Collection methods.
-   */
-  module CollectionMethodSignatures {
-    /**
-     * Holds if Collection method `name` interprets parameter `n` as a query.
-     */
-    predicate interpretsArgumentAsQuery(string m, int queryArgIdx) {
-      // implements most of the MongoDB interface
-      MongoDB::CollectionMethodSignatures::interpretsArgumentAsQuery(m, queryArgIdx)
-    }
-  }
-
-  /** A call to a Minimongo query method. */
-  private class QueryCall extends DatabaseAccess, API::CallNode {
-    int queryArgIdx;
-
-    QueryCall() {
-      exists(string m |
-        this =
-          API::moduleImport("minimongo")
-              .getAMember()
-              .getReturn()
-              .getAMember()
-              .getMember(m)
-              .getACall() and
-        CollectionMethodSignatures::interpretsArgumentAsQuery(m, queryArgIdx)
-      )
-    }
-
-    override DataFlow::Node getAQueryArgument() { result = getArgument(queryArgIdx) }
-
-    DataFlow::Node getACodeOperator() {
-      result = getADollarWhereProperty(getParameter(queryArgIdx))
-    }
-  }
-
-  /**
-   * An expression that is interpreted as a Minimongo query.
-   */
-  class Query extends NoSQL::Query {
-    QueryCall qc;
-
-    Query() { this = qc.getAQueryArgument().asExpr() }
-
-    override DataFlow::Node getACodeOperator() { result = qc.getACodeOperator() }
-  }
-}
-
-/**
- * Provides classes modeling the MarsDB library.
- */
-private module MarsDB {
-  /** A call to a MarsDB query method. */
-  private class QueryCall extends DatabaseAccess, API::CallNode {
-    int queryArgIdx;
-
-    QueryCall() {
-      exists(string m |
-        this =
-          API::moduleImport("marsdb").getMember("Collection").getInstance().getMember(m).getACall() and
-        // implements parts of the Minimongo interface
-        Minimongo::CollectionMethodSignatures::interpretsArgumentAsQuery(m, queryArgIdx)
-      )
-    }
-
-    override DataFlow::Node getAQueryArgument() { result = getArgument(queryArgIdx) }
-
-    DataFlow::Node getACodeOperator() {
-      result = getADollarWhereProperty(getParameter(queryArgIdx))
-    }
-  }
-
-  /**
-   * An expression that is interpreted as a MarsDB query.
-   */
-  class Query extends NoSQL::Query {
-    QueryCall qc;
-
-    Query() { this = qc.getAQueryArgument().asExpr() }
-
-    override DataFlow::Node getACodeOperator() { result = qc.getACodeOperator() }
-  }
-}
-
-/**
- * Provides classes modeling the `Node Redis` library.
- *
- * Redis is an in-memory key-value store and not a database,
- * but `Node Redis` can be exploited similarly to a NoSQL database by giving a method an array as argument instead of a string.
- * As an example the below two invocations of `client.set` are equivalent:
- *
- * ```
- * const redis = require("redis");
- * const client = redis.createClient();
- * client.set("key", "value");
- * client.set(["key", "value"]);
- * ```
- *
- * ioredis is a very similar library. However, ioredis does not support array arguments in the same way, and is therefore not vulnerable to the same kind of type confusion.
- */
-private module Redis {
-  /**
-   * Gets a `Node Redis` client.
-   */
-  private API::Node client() {
-    result = API::moduleImport("redis").getMember("createClient").getReturn()
-    or
-    result = API::moduleImport("redis").getMember("RedisClient").getInstance()
-    or
-    result = client().getMember("duplicate").getReturn()
-    or
-    result = client().getMember("duplicate").getLastParameter().getParameter(1)
-  }
-
-  /**
-   * Gets a (possibly chained) reference to a batch operation object.
-   * These have the same API as a redis client, except the calls are chained, and the sequence is terminated with a `.exec` call.
-   */
-  private API::Node multi() {
-    result = client().getMember(["multi", "batch"]).getReturn()
-    or
-    result = multi().getAMember().getReturn()
-  }
-
-  /**
-   * Gets a `Node Redis` client instance. Either a client created using `createClient()`, or a batch operation object.
-   */
-  private API::Node redis() { result = [client(), multi()] }
-
-  /**
-   * Provides signatures for the query methods from Node Redis.
-   */
-  module QuerySignatures {
-    /**
-     * Holds if `method` interprets parameter `argIndex` as a key, and a later parameter determines a value/field.
-     * Thereby the method is vulnerable if parameter `argIndex` is unexpectedly an array instead of a string, as an attacker can control arguments to Redis that the attacker was not supposed to control.
-     *
-     * Only setters and similar methods are included.
-     * For getter-like methods it is not generally possible to gain access "outside" of where you are supposed to have access,
-     * it is at most possible to get a Redis call to return more results than expected (e.g. by adding more members to [`geohash`](https://redis.io/commands/geohash)).
-     */
-    predicate argumentIsAmbiguousKey(string method, int argIndex) {
-      method =
-        [
-          "set", "publish", "append", "bitfield", "decrby", "getset", "hincrby", "hincrbyfloat",
-          "hset", "hsetnx", "incrby", "incrbyfloat", "linsert", "lpush", "lpushx", "lset", "ltrim",
-          "rename", "renamenx", "rpushx", "setbit", "setex", "smove", "zincrby", "zinterstore",
-          "hdel", "lpush", "pfadd", "rpush", "sadd", "sdiffstore", "srem"
-        ] and
-      argIndex = 0
-      or
-      method = ["bitop", "hmset", "mset", "msetnx", "geoadd"] and
-      argIndex in [0 .. any(DataFlow::InvokeNode invk).getNumArgument() - 1]
-    }
-  }
-
-  /**
-   * An expression that is interpreted as a key in a Node Redis call.
-   */
-  class RedisKeyArgument extends NoSQL::Query {
-    RedisKeyArgument() {
-      exists(string method, int argIndex |
-        QuerySignatures::argumentIsAmbiguousKey(method, argIndex) and
-        this = redis().getMember(method).getParameter(argIndex).getARhs().asExpr()
-      )
-    }
-  }
 }

javascript/ql/lib/semmle/javascript/frameworks/NodeJSLib.qll

@@ -448,56 +448,11 @@ module NodeJSLib {
    */
   module FS {
     /**
-     * A member `member` from module `fs` or its drop-in replacements `graceful-fs`, `fs-extra`, `original-fs`.
+     * A member `member` from module `fs`.
      */
     DataFlow::SourceNode moduleMember(string member) {
-      result = fsModule(DataFlow::TypeTracker::end()).getAPropertyRead(member)
-    }
-
-    private DataFlow::SourceNode fsModule(DataFlow::TypeTracker t) {
-      exists(string moduleName |
-        moduleName = ["mz/fs", "original-fs", "fs-extra", "graceful-fs", "fs"]
-      |
-        result = DataFlow::moduleImport(moduleName)
-        or
-        // extra support for flexible names
-        result.asExpr().(Require).getArgument(0).mayHaveStringValue(moduleName)
-      ) and
-      t.start()
-      or
-      t.start() and
-      result = DataFlow::moduleMember("fs", "promises")
-      or
-      exists(DataFlow::TypeTracker t2, DataFlow::SourceNode pred | pred = fsModule(t2) |
-        result = pred.track(t2, t)
-        or
-        t.continue() = t2 and
-        exists(Promisify::PromisifyAllCall promisifyAllCall |
-          result = promisifyAllCall and
-          pred.flowsTo(promisifyAllCall.getArgument(0))
-        )
-        or
-        // const fs = require('fs');
-        // let fs_copy = methods.reduce((obj, method) => {
-        //  obj[method] = fs[method];
-        //  return obj;
-        // }, {});
-        t.continue() = t2 and
-        exists(
-          DataFlow::MethodCallNode call, DataFlow::ParameterNode obj, DataFlow::SourceNode method
-        |
-          call.getMethodName() = "reduce" and
-          result = call and
-          obj = call.getABoundCallbackParameter(0, 0) and
-          obj.flowsTo(any(DataFlow::FunctionNode f).getAReturn()) and
-          exists(DataFlow::PropWrite write, DataFlow::PropRead read |
-            write = obj.getAPropertyWrite() and
-            method.flowsToExpr(write.getPropertyNameExpr()) and
-            method.flowsToExpr(read.getPropertyNameExpr()) and
-            read.getBase().getALocalSource() = fsModule(t2) and
-            write.getRhs() = maybePromisified(read)
-          )
-        )
+      exists(string moduleName | moduleName = ["fs"] |
+        result = DataFlow::moduleMember(moduleName, member)
       )
     }
   }
@@ -508,7 +463,7 @@ module NodeJSLib {
   private class NodeJSFileSystemAccess extends FileSystemAccess, DataFlow::CallNode {
     string methodName;
 
-    NodeJSFileSystemAccess() { this = maybePromisified(FS::moduleMember(methodName)).getACall() }
+    NodeJSFileSystemAccess() { this = FS::moduleMember(methodName).getACall() }
 
     /**
      * Gets the name of the called method.

javascript/ql/lib/semmle/javascript/frameworks/SQL.qll

@@ -28,54 +28,38 @@ module SQL {
  * Provides classes modelling the (API compatible) `mysql` and `mysql2` packages.
  */
 private module MySql {
-  private string moduleName() { result = ["mysql", "mysql2", "mysql2/promise"] }
+  private DataFlow::SourceNode mysql() { result = DataFlow::moduleImport(["mysql", "mysql2"]) }
 
-  /** Gets the package name `mysql` or `mysql2`. */
-  API::Node mysql() { result = API::moduleImport(moduleName()) }
+  private DataFlow::CallNode createPool() { result = mysql().getAMemberCall("createPool") }
 
-  /** Gets a reference to `mysql.createConnection`. */
-  API::Node createConnection() {
-    result = mysql().getMember(["createConnection", "createConnectionPromise"])
+  /** Gets a reference to a MySQL pool. */
+  private DataFlow::SourceNode pool(DataFlow::TypeTracker t) {
+    t.start() and
+    result = createPool()
   }
 
-  /** Gets a reference to `mysql.createPool`. */
-  API::Node createPool() { result = mysql().getMember(["createPool", "createPoolCluster"]) }
+  /** Gets a reference to a MySQL pool. */
+  private DataFlow::SourceNode pool() { result = pool(DataFlow::TypeTracker::end()) }
 
-  /** Gets a node that contains a MySQL pool created using `mysql.createPool()`. */
-  API::Node pool() {
-    result = createPool().getReturn()
-    or
-    result = pool().getMember("on").getReturn()
-    or
-    result = API::Node::ofType(moduleName(), ["Pool", "PoolCluster"])
-  }
+  /** Gets a call to `mysql.createConnection`. */
+  DataFlow::CallNode createConnection() { result = mysql().getAMemberCall("createConnection") }
 
-  /** Gets a data flow node that contains a freshly created MySQL connection instance. */
-  API::Node connection() {
-    result = createConnection().getReturn()
-    or
-    result = createConnection().getReturn().getPromised()
-    or
-    result = pool().getMember("getConnection").getParameter(0).getParameter(1)
-    or
-    result = pool().getMember("getConnection").getPromised()
-    or
-    exists(API::CallNode call |
-      call = pool().getMember("on").getACall() and
-      call.getArgument(0).getStringValue() = ["connection", "acquire", "release"] and
-      result = call.getParameter(1).getParameter(0)
+  /** Gets a reference to a MySQL connection instance. */
+  private DataFlow::SourceNode connection(DataFlow::TypeTracker t) {
+    t.start() and
+    (
+      result = createConnection()
+      or
+      result = pool().getAMethodCall("getConnection").getABoundCallbackParameter(0, 1)
     )
-    or
-    result = API::Node::ofType(moduleName(), ["Connection", "PoolConnection"])
   }
 
+  /** Gets a reference to a MySQL connection instance. */
+  DataFlow::SourceNode connection() { result = connection(DataFlow::TypeTracker::end()) }
+
   /** A call to the MySql `query` method. */
   private class QueryCall extends DatabaseAccess, DataFlow::MethodCallNode {
-    QueryCall() {
-      exists(API::Node recv | recv = pool() or recv = connection() |
-        this = recv.getMember(["query", "execute"]).getACall()
-      )
-    }
+    QueryCall() { this = [pool(), connection()].getAMethodCall("query") }
 
     override DataFlow::Node getAQueryArgument() { result = getArgument(0) }
   }
@@ -88,7 +72,7 @@ private module MySql {
   /** A call to the `escape` or `escapeId` method that performs SQL sanitization. */
   class EscapingSanitizer extends SQL::SqlSanitizer, MethodCallExpr {
     EscapingSanitizer() {
-      this = [mysql(), pool(), connection()].getMember(["escape", "escapeId"]).getACall().asExpr() and
+      this = [mysql(), pool(), connection()].getAMethodCall(["escape", "escapeId"]).asExpr() and
       input = this.getArgument(0) and
       output = this
     }
@@ -99,9 +83,8 @@ private module MySql {
     string kind;
 
     Credentials() {
-      exists(API::Node callee, string prop |
-        callee in [createConnection(), createPool()] and
-        this = callee.getParameter(0).getMember(prop).getARhs().asExpr() and
+      exists(string prop |
+        this = [createConnection(), createPool()].getOptionArgument(0, prop).asExpr() and
         (
           prop = "user" and kind = "user name"
           or
@@ -118,61 +101,23 @@ private module MySql {
  * Provides classes modelling the PostgreSQL packages, such as `pg` and `pg-promise`.
  */
 private module Postgres {
-  API::Node pg() {
-    result = API::moduleImport("pg")
-    or
-    result = pgpMain().getMember("pg")
-  }
-
-  /** Gets a reference to the `Client` constructor in the `pg` package, for example `require('pg').Client`. */
-  API::Node newClient() { result = pg().getMember("Client") }
-
-  /** Gets a freshly created Postgres client instance. */
-  API::Node client() {
-    result = newClient().getInstance()
-    or
-    // pool.connect(function(err, client) { ... })
-    result = pool().getMember("connect").getParameter(0).getParameter(1)
-    or
-    // await pool.connect()
-    result = pool().getMember("connect").getReturn().getPromised()
-    or
-    result = pgpConnection().getMember("client")
-    or
-    exists(API::CallNode call |
-      call = pool().getMember("on").getACall() and
-      call.getArgument(0).getStringValue() = ["connect", "acquire"] and
-      result = call.getParameter(1).getParameter(0)
-    )
-    or
-    result = client().getMember("on").getReturn()
-    or
-    result = API::Node::ofType("pg", ["Client", "PoolClient"])
-  }
-
-  /** Gets a constructor that when invoked constructs a new connection pool. */
-  API::Node newPool() {
+  /** Gets an expression that constructs a new connection pool. */
+  DataFlow::InvokeNode newPool() {
     // new require('pg').Pool()
-    result = pg().getMember("Pool")
+    result = DataFlow::moduleImport("pg").getAConstructorInvocation("Pool")
     or
     // new require('pg-pool')
-    result = API::moduleImport("pg-pool")
+    result = DataFlow::moduleImport("pg-pool").getAnInstantiation()
   }
 
-  /** Gets an API node that refers to a connection pool. */
-  API::Node pool() {
-    result = newPool().getInstance()
-    or
-    result = pgpDatabase().getMember("$pool")
-    or
-    result = pool().getMember("on").getReturn()
-    or
-    result = API::Node::ofType("pg", "Pool")
+  /** Gets a creation of a Postgres client. */
+  DataFlow::InvokeNode newClient() {
+    result = DataFlow::moduleImport("pg").getAConstructorInvocation("Client")
   }
 
   /** A call to the Postgres `query` method. */
   private class QueryCall extends DatabaseAccess, DataFlow::MethodCallNode {
-    QueryCall() { this = [client(), pool()].getMember("query").getACall() }
+    QueryCall() { this = [newClient(), newPool()].getAMethodCall("query") }
 
     override DataFlow::Node getAQueryArgument() { result = getArgument(0) }
   }
@@ -191,11 +136,7 @@ private module Postgres {
     string kind;
 
     Credentials() {
-      exists(string prop |
-        this = [newClient(), newPool()].getParameter(0).getMember(prop).getARhs().asExpr()
-        or
-        this = pgPromise().getParameter(0).getMember(prop).getARhs().asExpr()
-      |
+      exists(string prop | this = [newClient(), newPool()].getOptionArgument(0, prop).asExpr() |
         prop = "user" and kind = "user name"
         or
         prop = "password" and kind = prop
@@ -335,35 +276,30 @@ private module Postgres {
  */
 private module Sqlite {
   /** Gets a reference to the `sqlite3` module. */
-  API::Node sqlite() {
-    result = API::moduleImport("sqlite3")
+  DataFlow::SourceNode sqlite() {
+    result = DataFlow::moduleImport("sqlite3")
     or
-    result = sqlite().getMember("verbose").getReturn()
+    result = sqlite().getAMemberCall("verbose")
   }
 
-  /** Gets an expression that constructs or returns a Sqlite database instance. */
-  API::Node database() {
+  /** Gets an expression that constructs a Sqlite database instance. */
+  DataFlow::SourceNode newDb() {
     // new require('sqlite3').Database()
-    result = sqlite().getMember("Database").getInstance()
-    or
-    // chained call
-    result = getAChainingQueryCall()
-    or
-    result = API::Node::ofType("sqlite3", "Database")
+    result = sqlite().getAConstructorInvocation("Database")
   }
 
-  /** A call to a query method on a Sqlite database instance that returns the same instance. */
-  private API::Node getAChainingQueryCall() {
-    result = database().getMember(["all", "each", "exec", "get", "run"]).getReturn()
+  /** Gets a data flow node referring to a Sqlite database instance. */
+  private DataFlow::SourceNode db(DataFlow::TypeTracker t) {
+    t.start() and
+    result = newDb()
   }
 
+  /** Gets a data flow node referring to a Sqlite database instance. */
+  DataFlow::SourceNode db() { result = db(DataFlow::TypeTracker::end()) }
+
   /** A call to a Sqlite query method. */
   private class QueryCall extends DatabaseAccess, DataFlow::MethodCallNode {
-    QueryCall() {
-      this = getAChainingQueryCall().getAnImmediateUse()
-      or
-      this = database().getMember("prepare").getACall()
-    }
+    QueryCall() { this = db().getAMethodCall(["all", "each", "exec", "get", "prepare", "run"]) }
 
     override DataFlow::Node getAQueryArgument() { result = getArgument(0) }
   }
@@ -373,276 +309,3 @@ private module Sqlite {
     QueryString() { this = any(QueryCall qc).getAQueryArgument().asExpr() }
   }
 }
-
-/**
- * Provides classes modelling the `mssql` package.
- */
-private module MsSql {
-  /** Gets a reference to the `mssql` module. */
-  API::Node mssql() { result = API::moduleImport("mssql") }
-
-  /** Gets a node referring to an instance of the given class. */
-  API::Node mssqlClass(string name) {
-    result = mssql().getMember(name).getInstance()
-    or
-    result = API::Node::ofType("mssql", name)
-  }
-
-  /** Gets an API node referring to a Request object. */
-  API::Node request() {
-    result = mssqlClass("Request")
-    or
-    result = request().getMember(["input", "replaceInput", "output", "replaceOutput"]).getReturn()
-    or
-    result = [transaction(), pool()].getMember("request").getReturn()
-  }
-
-  /** Gets an API node referring to a Transaction object. */
-  API::Node transaction() {
-    result = mssqlClass("Transaction")
-    or
-    result = pool().getMember("transaction").getReturn()
-  }
-
-  /** Gets a API node referring to a ConnectionPool object. */
-  API::Node pool() { result = mssqlClass("ConnectionPool") }
-
-  /** A tagged template evaluated as a query. */
-  private class QueryTemplateExpr extends DatabaseAccess, DataFlow::ValueNode {
-    override TaggedTemplateExpr astNode;
-
-    QueryTemplateExpr() {
-      mssql().getMember("query").getAUse() = DataFlow::valueNode(astNode.getTag())
-    }
-
-    override DataFlow::Node getAQueryArgument() {
-      result = DataFlow::valueNode(astNode.getTemplate().getAnElement())
-    }
-  }
-
-  /** A call to a MsSql query method. */
-  private class QueryCall extends DatabaseAccess, DataFlow::MethodCallNode {
-    QueryCall() { this = [mssql(), request()].getMember(["query", "batch"]).getACall() }
-
-    override DataFlow::Node getAQueryArgument() { result = getArgument(0) }
-  }
-
-  /** An expression that is passed to a method that interprets it as SQL. */
-  class QueryString extends SQL::SqlString {
-    QueryString() {
-      exists(DatabaseAccess dba | dba instanceof QueryTemplateExpr or dba instanceof QueryCall |
-        this = dba.getAQueryArgument().asExpr()
-      )
-    }
-  }
-
-  /** An element of a query template, which is automatically sanitized. */
-  class QueryTemplateSanitizer extends SQL::SqlSanitizer {
-    QueryTemplateSanitizer() {
-      this = any(QueryTemplateExpr qte).getAQueryArgument().asExpr() and
-      input = this and
-      output = this
-    }
-  }
-
-  /** An expression that is passed as user name or password when creating a client or a pool. */
-  class Credentials extends CredentialsExpr {
-    string kind;
-
-    Credentials() {
-      exists(API::Node callee, string prop |
-        (
-          callee = mssql().getMember("connect")
-          or
-          callee = mssql().getMember("ConnectionPool")
-        ) and
-        this = callee.getParameter(0).getMember(prop).getARhs().asExpr() and
-        (
-          prop = "user" and kind = "user name"
-          or
-          prop = "password" and kind = prop
-        )
-      )
-    }
-
-    override string getCredentialsKind() { result = kind }
-  }
-}
-
-/**
- * Provides classes modelling the `sequelize` package.
- */
-private module Sequelize {
-  /** Gets an import of the `sequelize` module or one that re-exports it. */
-  API::Node sequelize() { result = API::moduleImport(["sequelize", "sequelize-typescript"]) }
-
-  /** Gets an expression that creates an instance of the `Sequelize` class. */
-  API::Node instance() {
-    result = [sequelize(), sequelize().getMember("Sequelize")].getInstance()
-    or
-    result = API::Node::ofType(["sequelize", "sequelize-typescript"], ["Sequelize", "default"])
-  }
-
-  /** A call to `Sequelize.query`. */
-  private class QueryCall extends DatabaseAccess, DataFlow::MethodCallNode {
-    QueryCall() { this = instance().getMember("query").getACall() }
-
-    override DataFlow::Node getAQueryArgument() {
-      result = getArgument(0)
-      or
-      result = getOptionArgument(0, "query")
-    }
-  }
-
-  /** An expression that is passed to `Sequelize.query` method and hence interpreted as SQL. */
-  class QueryString extends SQL::SqlString {
-    QueryString() {
-      this = any(QueryCall qc).getAQueryArgument().asExpr()
-      or
-      this = sequelize().getMember(["literal", "asIs"]).getParameter(0).getARhs().asExpr()
-    }
-  }
-
-  /**
-   * An expression that is passed as user name or password when creating an instance of the
-   * `Sequelize` class.
-   */
-  class Credentials extends CredentialsExpr {
-    string kind;
-
-    Credentials() {
-      exists(NewExpr ne, string prop |
-        ne = sequelize().getAnInstantiation().asExpr() and
-        (
-          this = ne.getArgument(1) and prop = "username"
-          or
-          this = ne.getArgument(2) and prop = "password"
-          or
-          ne.hasOptionArgument(ne.getNumArgument() - 1, prop, this)
-        ) and
-        (
-          prop = "username" and kind = "user name"
-          or
-          prop = "password" and kind = prop
-        )
-      )
-    }
-
-    override string getCredentialsKind() { result = kind }
-  }
-}
-
-/**
- * Provides classes modelling the Google Cloud Spanner library.
- */
-private module Spanner {
-  /**
-   * Gets a node that refers to the `Spanner` class
-   */
-  API::Node spanner() {
-    // older versions
-    result = API::moduleImport("@google-cloud/spanner")
-    or
-    // newer versions
-    result = API::moduleImport("@google-cloud/spanner").getMember("Spanner")
-  }
-
-  /**
-   * Gets a node that refers to an instance of the `Database` class.
-   */
-  API::Node database() {
-    result =
-      spanner().getReturn().getMember("instance").getReturn().getMember("database").getReturn()
-    or
-    result = API::Node::ofType("@google-cloud/spanner", "Database")
-  }
-
-  /**
-   * Gets a node that refers to an instance of the `v1.SpannerClient` class.
-   */
-  API::Node v1SpannerClient() {
-    result = spanner().getMember("v1").getMember("SpannerClient").getInstance()
-    or
-    result = API::Node::ofType("@google-cloud/spanner", "v1.SpannerClient")
-  }
-
-  /**
-   * Gets a node that refers to a transaction object.
-   */
-  API::Node transaction() {
-    result =
-      database()
-          .getMember(["runTransaction", "runTransactionAsync"])
-          .getParameter([0, 1])
-          .getParameter(1)
-    or
-    result = API::Node::ofType("@google-cloud/spanner", "Transaction")
-  }
-
-  /** Gets an API node referring to a `BatchTransaction` object. */
-  API::Node batchTransaction() {
-    result = database().getMember("batchTransaction").getReturn()
-    or
-    result = database().getMember("createBatchTransaction").getReturn().getPromised()
-    or
-    result = API::Node::ofType("@google-cloud/spanner", "BatchTransaction")
-  }
-
-  /**
-   * A call to a Spanner method that executes a SQL query.
-   */
-  abstract class SqlExecution extends DatabaseAccess, DataFlow::InvokeNode { }
-
-  /**
-   * A SQL execution that takes the input directly in the first argument or in the `sql` option.
-   */
-  class SqlExecutionDirect extends SqlExecution {
-    SqlExecutionDirect() {
-      this = database().getMember(["run", "runPartitionedUpdate", "runStream"]).getACall()
-      or
-      this = transaction().getMember(["run", "runStream", "runUpdate"]).getACall()
-      or
-      this = batchTransaction().getMember("createQueryPartitions").getACall()
-    }
-
-    override DataFlow::Node getAQueryArgument() {
-      result = getArgument(0)
-      or
-      result = getOptionArgument(0, "sql")
-    }
-  }
-
-  /**
-   * A SQL execution that takes an array of SQL strings or { sql: string } objects.
-   */
-  class SqlExecutionBatch extends SqlExecution, API::CallNode {
-    SqlExecutionBatch() { this = transaction().getMember("batchUpdate").getACall() }
-
-    override DataFlow::Node getAQueryArgument() {
-      // just use the whole array as the query argument, as arrays becomes tainted if one of the elements
-      // are tainted
-      result = getArgument(0)
-      or
-      result = getParameter(0).getUnknownMember().getMember("sql").getARhs()
-    }
-  }
-
-  /**
-   * A SQL execution that only takes the input in the `sql` option, and do not accept query strings
-   * directly.
-   */
-  class SqlExecutionWithOption extends SqlExecution {
-    SqlExecutionWithOption() {
-      this = v1SpannerClient().getMember(["executeSql", "executeStreamingSql"]).getACall()
-    }
-
-    override DataFlow::Node getAQueryArgument() { result = getOptionArgument(0, "sql") }
-  }
-
-  /**
-   * An expression that is interpreted as a SQL string.
-   */
-  class QueryString extends SQL::SqlString {
-    QueryString() { this = any(SqlExecution se).getAQueryArgument().asExpr() }
-  }
-}

javascript/ql/lib/semmle/javascript/frameworks/TorrentLibraries.qll

@@ -36,25 +36,7 @@ module ParseTorrent {
    * An access to user-controlled torrent information.
    */
   class UserControlledTorrentInfo extends RemoteFlowSource {
-    UserControlledTorrentInfo() {
-      exists(DataFlow::SourceNode ref, DataFlow::PropRead read |
-        ref = parsedTorrentRef() and
-        read = ref.getAPropertyRead() and
-        this = read
-      |
-        exists(string prop |
-          not (
-            prop = "private" or
-            prop = "infoHash" or
-            prop = "length"
-            // "pieceLength" and "lastPieceLength" are not guaranteed to be numbers as of commit ae3ad15d
-          ) and
-          read.getPropertyName() = prop
-        )
-        or
-        not exists(read.getPropertyName())
-      )
-    }
+    UserControlledTorrentInfo() { none() }
 
     override string getSourceType() { result = "torrent information" }
   }

javascript/ql/lib/semmle/javascript/frameworks/jQuery.qll

@@ -484,8 +484,6 @@ module JQuery {
   private DataFlow::SourceNode dollar(DataFlow::TypeTracker t) {
     t.start() and
     result = dollarSource()
-    or
-    exists(DataFlow::TypeTracker t2 | result = dollar(t2).track(t2, t))
   }
 
   /**
@@ -519,14 +517,6 @@ module JQuery {
       }
     }
 
-    /**
-     * A `this` node in a JQuery plugin function, which is a JQuery object.
-     */
-    private class JQueryPluginThisObject extends Range {
-      JQueryPluginThisObject() {
-        this = DataFlow::thisNode(any(JQueryPluginMethod method).getFunction())
-      }
-    }
   }
 
   /** A source of jQuery objects from the AST-based `JQueryObject` class. */

javascript/ql/lib/semmle/javascript/security/dataflow/CodeInjectionCustomizations.qll

@@ -229,14 +229,8 @@ module CodeInjection {
   }
 
   /**
-   * A code operator of a NoSQL query as a code injection sink.
-   */
-  class NoSQLCodeInjectionSink extends Sink {
-    NoSQLCodeInjectionSink() { any(NoSQL::Query q).getACodeOperator() = this }
-  }
-
-  /**
-   * The first argument to `Module.prototype._compile`, considered as a code-injection sink.
+   * The first argument to `Module.prototype._compile` from the Node.js built-in module `module`,
+   * considered as a code-injection sink.
    */
   class ModuleCompileSink extends Sink {
     ModuleCompileSink() {

javascript/ql/lib/semmle/javascript/security/dataflow/TaintedPathCustomizations.qll

@@ -55,7 +55,7 @@ module TaintedPath {
      * There are currently four flow labels, representing the different combinations of
      * normalization and absoluteness.
      */
-    abstract class PosixPath extends DataFlow::FlowLabel {
+    class PosixPath extends DataFlow::FlowLabel {
       Normalization normalization;
       Relativeness relativeness;
 
@@ -113,7 +113,7 @@ module TaintedPath {
     /**
      * A flow label representing an array of path elements that may include "..".
      */
-    abstract class SplitPath extends DataFlow::FlowLabel {
+    class SplitPath extends DataFlow::FlowLabel {
       SplitPath() { this = "splitPath" }
     }
   }
@@ -218,12 +218,12 @@ module TaintedPath {
       output = this
       or
       // non-global replace or replace of something other than /\.\./g, /[/]/g, or /[\.]/g.
-      this instanceof StringReplaceCall and
+      this.getCalleeName() = "replace" and
       input = getReceiver() and
       output = this and
       not exists(RegExpLiteral literal, RegExpTerm term |
-        this.(StringReplaceCall).getRegExp().asExpr() = literal and
-        this.(StringReplaceCall).isGlobal() and
+        getArgument(0).getALocalSource().asExpr() = literal and
+        literal.isGlobal() and
         literal.getRoot() = term
       |
         term.getAMatchedString() = "/" or
@@ -247,15 +247,16 @@ module TaintedPath {
   /**
    * A call that removes all instances of "../" in the prefix of the string.
    */
-  class DotDotSlashPrefixRemovingReplace extends StringReplaceCall {
+  class DotDotSlashPrefixRemovingReplace extends DataFlow::CallNode {
     DataFlow::Node input;
     DataFlow::Node output;
 
     DotDotSlashPrefixRemovingReplace() {
+      this.getCalleeName() = "replace" and
       input = getReceiver() and
       output = this and
       exists(RegExpLiteral literal, RegExpTerm term |
-        getRegExp().asExpr() = literal and
+        getArgument(0).getALocalSource().asExpr() = literal and
         (term instanceof RegExpStar or term instanceof RegExpPlus) and
         term.getChild(0) = getADotDotSlashMatcher()
       |
@@ -297,16 +298,17 @@ module TaintedPath {
   /**
    * A call that removes all "." or ".." from a path, without also removing all forward slashes.
    */
-  class DotRemovingReplaceCall extends StringReplaceCall {
+  class DotRemovingReplaceCall extends DataFlow::CallNode {
     DataFlow::Node input;
     DataFlow::Node output;
 
     DotRemovingReplaceCall() {
+      this.getCalleeName() = "replace" and
       input = getReceiver() and
       output = this and
-      isGlobal() and
       exists(RegExpLiteral literal, RegExpTerm term |
-        getRegExp().asExpr() = literal and
+        getArgument(0).getALocalSource().asExpr() = literal and
+        literal.isGlobal() and
         literal.getRoot() = term and
         not term.getAMatchedString() = "/"
       |
@@ -606,8 +608,6 @@ module TaintedPath {
       (
         this = fileSystemAccess.getAPathArgument() and
         not exists(fileSystemAccess.getRootPathArgument())
-        or
-        this = fileSystemAccess.getRootPathArgument()
       ) and
       not this = any(ResolvingPathCall call).getInput()
     }
@@ -648,74 +648,6 @@ module TaintedPath {
     AngularJSTemplateUrlSink() { this = any(AngularJS::CustomDirective d).getMember("templateUrl") }
   }
 
-  /**
-   * The path argument of a [send](https://www.npmjs.com/package/send) call, viewed as a sink.
-   */
-  class SendPathSink extends Sink, DataFlow::ValueNode {
-    SendPathSink() { this = DataFlow::moduleImport("send").getACall().getArgument(1) }
-  }
-
-  /**
-   * A path argument given to a `Page` in puppeteer, specifying where a pdf/screenshot should be saved.
-   */
-  private class PuppeteerPath extends TaintedPath::Sink {
-    PuppeteerPath() {
-      this =
-        Puppeteer::page()
-            .getMember(["pdf", "screenshot"])
-            .getParameter(0)
-            .getMember("path")
-            .getARhs()
-    }
-  }
-
-  /**
-   * An argument given to the `prettier` library specifying the location of a config file.
-   */
-  private class PrettierFileSink extends TaintedPath::Sink {
-    PrettierFileSink() {
-      this =
-        API::moduleImport("prettier")
-            .getMember(["resolveConfig", "resolveConfigFile", "getFileInfo"])
-            .getACall()
-            .getArgument(0)
-      or
-      this =
-        API::moduleImport("prettier")
-            .getMember("resolveConfig")
-            .getACall()
-            .getParameter(1)
-            .getMember("config")
-            .getARhs()
-    }
-  }
-
-  /**
-   * The `cwd` option for the `read-pkg` library.
-   */
-  private class ReadPkgCwdSink extends TaintedPath::Sink {
-    ReadPkgCwdSink() {
-      this =
-        API::moduleImport("read-pkg")
-            .getMember(["readPackageAsync", "readPackageSync"])
-            .getParameter(0)
-            .getMember("cwd")
-            .getARhs()
-    }
-  }
-
-  /**
-   * The `cwd` option to a shell execution.
-   */
-  private class ShellCwdSink extends TaintedPath::Sink {
-    ShellCwdSink() {
-      exists(SystemCommandExecution sys, API::Node opts |
-        opts.getARhs() = sys.getOptionsArg() and // assuming that an API::Node exists here.
-        this = opts.getMember("cwd").getARhs()
-      )
-    }
-  }
-
   /**
    * Holds if there is a step `src -> dst` mapping `srclabel` to `dstlabel` relevant for path traversal vulnerabilities.
    */

javascript/ql/lib/semmle/javascript/security/dataflow/Xss.qll

@@ -183,17 +183,6 @@ module DomBasedXss {
       this = any(Typeahead::TypeaheadSuggestionFunction f).getAReturn()
       or
       this = any(Handlebars::SafeString s).getAnArgument()
-      or
-      this = any(JQuery::MethodCall call | call.getMethodName() = "jGrowl").getArgument(0)
-      or
-      // A construction of a JSDOM object (server side DOM), where scripts are allowed.
-      exists(DataFlow::NewNode instance |
-        instance = API::moduleImport("jsdom").getMember("JSDOM").getInstance().getAnImmediateUse() and
-        this = instance.getArgument(0) and
-        instance.getOptionArgument(1, "runScripts").mayHaveStringValue("dangerously")
-      )
-      or
-      MooTools::interpretsNodeAsHtml(this)
     }
   }