fix(s3): handle empty Action in bucket policy (#4328)

prowler/providers/aws/services/s3/s3_bucket_secure_transport_policy/s3_bucket_secure_transport_policy.py

@@ -22,6 +22,7 @@ class s3_bucket_secure_transport_policy(Check):
                     if (
                         statement["Effect"] == "Deny"
                         and "Condition" in statement
+                        and "Action" in statement
                         and (
                             "s3:PutObject" in statement["Action"]
                             or "*" in statement["Action"]

tests/providers/aws/services/s3/s3_bucket_secure_transport_policy/s3_bucket_secure_transport_policy_test.py

@@ -171,3 +171,65 @@ class Test_s3_bucket_secure_transport_policy:
                     == f"arn:{aws_provider.identity.partition}:s3:::{bucket_name_us}"
                 )
                 assert result[0].region == AWS_REGION_US_EAST_1
+
+    @mock_aws
+    def test_bucket_uncomply_policy_without_action(self):
+        s3_client_us_east_1 = client("s3", region_name=AWS_REGION_US_EAST_1)
+        bucket_name_us = "bucket_test_us"
+        s3_client_us_east_1.create_bucket(Bucket=bucket_name_us)
+
+        ssl_policy = """
+{
+  "Version": "2012-10-17",
+  "Id": "PutObjPolicy",
+  "Statement": [
+    {
+      "Sid": "s3-bucket-ssl-requests-only",
+      "Effect": "Deny",
+      "Principal": "*",
+      "Resource": "arn:aws:s3:::bucket_test_us/*",
+      "Condition": {
+        "Bool": {
+          "aws:SecureTransport": "false"
+        }
+      }
+    }
+  ]
+}
+"""
+        s3_client_us_east_1.put_bucket_policy(
+            Bucket=bucket_name_us,
+            Policy=ssl_policy,
+        )
+        from prowler.providers.aws.services.s3.s3_service import S3
+
+        aws_provider = set_mocked_aws_provider([AWS_REGION_US_EAST_1])
+
+        with mock.patch(
+            "prowler.providers.common.provider.Provider.get_global_provider",
+            return_value=aws_provider,
+        ):
+            with mock.patch(
+                "prowler.providers.aws.services.s3.s3_bucket_secure_transport_policy.s3_bucket_secure_transport_policy.s3_client",
+                new=S3(aws_provider),
+            ):
+                # Test Check
+                from prowler.providers.aws.services.s3.s3_bucket_secure_transport_policy.s3_bucket_secure_transport_policy import (
+                    s3_bucket_secure_transport_policy,
+                )
+
+                check = s3_bucket_secure_transport_policy()
+                result = check.execute()
+
+                assert len(result) == 1
+                assert result[0].status == "FAIL"
+                assert (
+                    result[0].status_extended
+                    == f"S3 Bucket {bucket_name_us} allows requests over insecure transport in the bucket policy."
+                )
+                assert result[0].resource_id == bucket_name_us
+                assert (
+                    result[0].resource_arn
+                    == f"arn:{aws_provider.identity.partition}:s3:::{bucket_name_us}"
+                )
+                assert result[0].region == AWS_REGION_US_EAST_1