Python: Move PolynomialReDoS to new dataflow API

Author: RasmusWL

python/ql/lib/semmle/python/security/dataflow/PolynomialReDoSQuery.qll

@@ -12,9 +12,11 @@ import semmle.python.dataflow.new.TaintTracking
 import PolynomialReDoSCustomizations::PolynomialReDoS
 
 /**
+ * DEPRECATED: Use `PolynomialReDoSFlow` module instead.
+ *
  * A taint-tracking configuration for detecting "polynomial regular expression denial of service (ReDoS)" vulnerabilities.
  */
-class Configuration extends TaintTracking::Configuration {
+deprecated class Configuration extends TaintTracking::Configuration {
   Configuration() { this = "PolynomialReDoS" }
 
   override predicate isSource(DataFlow::Node source) { source instanceof Source }
@@ -27,3 +29,14 @@ class Configuration extends TaintTracking::Configuration {
     guard instanceof SanitizerGuard
   }
 }
+
+private module PolynomialReDoSConfig implements DataFlow::ConfigSig {
+  predicate isSource(DataFlow::Node source) { source instanceof Source }
+
+  predicate isSink(DataFlow::Node sink) { sink instanceof Sink }
+
+  predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }
+}
+
+/** Global taint-tracking for detecting "polynomial regular expression denial of service (ReDoS)" vulnerabilities. */
+module PolynomialReDoSFlow = TaintTracking::Global<PolynomialReDoSConfig>;

python/ql/src/Security/CWE-730/PolynomialReDoS.ql

@@ -15,13 +15,13 @@
 
 import python
 import semmle.python.security.dataflow.PolynomialReDoSQuery
-import DataFlow::PathGraph
+import PolynomialReDoSFlow::PathGraph
 
 from
-  Configuration config, DataFlow::PathNode source, DataFlow::PathNode sink, Sink sinkNode,
+  PolynomialReDoSFlow::PathNode source, PolynomialReDoSFlow::PathNode sink, Sink sinkNode,
   PolynomialBackTrackingTerm regexp
 where
-  config.hasFlowPath(source, sink) and
+  PolynomialReDoSFlow::flowPath(source, sink) and
   sinkNode = sink.getNode() and
   regexp.getRootTerm() = sinkNode.getRegExp()
 //   not (