Python: Move experimental InsecureRandomness to new dataflow API

Author: RasmusWL

python/ql/src/experimental/Security/CWE-338/InsecureRandomness.ql

@@ -14,11 +14,12 @@
  */
 
 import python
-import experimental.semmle.python.security.InsecureRandomness::InsecureRandomness
+import experimental.semmle.python.security.InsecureRandomness
 import semmle.python.dataflow.new.DataFlow
-import DataFlow::PathGraph
 
-from Configuration cfg, DataFlow::PathNode source, DataFlow::PathNode sink
-where cfg.hasFlowPath(source, sink)
+import InsecureRandomness::Flow::PathGraph
+
+from InsecureRandomness::Flow::PathNode source, InsecureRandomness::Flow::PathNode sink
+where InsecureRandomness::Flow::flowPath(source, sink)
 select sink.getNode(), source, sink, "Cryptographically insecure $@ in a security context.",
   source.getNode(), "random value"

python/ql/src/experimental/semmle/python/security/InsecureRandomness.qll

@@ -21,17 +21,14 @@ module InsecureRandomness {
    * A taint-tracking configuration for reasoning about random values that are
    * not cryptographically secure.
    */
-  class Configuration extends TaintTracking::Configuration {
-    Configuration() { this = "InsecureRandomness" }
+  private module Configuration implements DataFlow::ConfigSig {
+    predicate isSource(DataFlow::Node source) { source instanceof Source }
 
-    override predicate isSource(DataFlow::Node source) { source instanceof Source }
+    predicate isSink(DataFlow::Node sink) { sink instanceof Sink }
 
-    override predicate isSink(DataFlow::Node sink) { sink instanceof Sink }
-
-    override predicate isSanitizer(DataFlow::Node node) { node instanceof Sanitizer }
-
-    deprecated override predicate isSanitizerGuard(DataFlow::BarrierGuard guard) {
-      guard instanceof SanitizerGuard
-    }
+    predicate isBarrier(DataFlow::Node node) { node instanceof Sanitizer }
   }
+
+  /** Global taint-tracking for detecting "random values that are not cryptographically secure" vulnerabilities. */
+  module Flow = TaintTracking::Global<Configuration>;
 }