C#: Add support the generic version of specifying auto validate.

Author: michaelnebel

csharp/ql/lib/semmle/code/csharp/frameworks/microsoft/AspNetCore.qll

@@ -173,8 +173,8 @@ class MicrosoftAspNetCoreMvcFilterCollection extends Class {
 
   /** Gets an `Add` method. */
   Method getAddMethod() {
-    result = this.getAMethod("Add") or
-    result = this.getABaseType().getAMethod("Add")
+    result = this.getAMethod(["Add", "Add`1"]) or
+    result = this.getABaseType().getAMethod(["Add", "Add`1"])
   }
 }
 

csharp/ql/src/Security Features/CWE-352/MissingAntiForgeryTokenValidation.ql

@@ -49,11 +49,15 @@ private predicate hasGlobalWebMvcAntiforgeryFilter(Compilation compilation) {
 
 predicate hasGlobalAspNetMvcAntiForgeryFilter(Compilation compilation) {
   exists(MethodCall addGlobalFilter, MethodCall registrationCall |
-    addGlobalFilter.getTarget() =
+    addGlobalFilter.getTarget().getUnboundDeclaration() =
       any(AspNetCore::MicrosoftAspNetCoreMvcFilterCollection collection).getAddMethod() and
     // The filter is the `AutoValidateAntiforgeryTokenAttribute` filter.
-    addGlobalFilter.getArgument(0).getType() instanceof
-      AspNetCore::AutoValidateAntiforgeryTokenAttribute and
+    (
+      addGlobalFilter.getArgument(0).getType() instanceof
+        AspNetCore::AutoValidateAntiforgeryTokenAttribute or
+      addGlobalFilter.getTarget().(ConstructedGeneric).getTypeArgument(0) instanceof
+        AspNetCore::AutoValidateAntiforgeryTokenAttribute
+    ) and
     // The filter is added in an ASP.NET Core registration call, which is provided as a lambda argument
     // to the Mvc registration method.
     registrationCall.getTarget() instanceof AspNetCore::MicrosoftAspNetCoreMvcRegistration and