fix(terraform): Added a check to make sure dynamic "blocks" are of th…

…e expected type (#5642)

* fix-scalar-dynamic: Added a check to make sure dynamic "blocks" are actually of the correct type

* fix-scalar-dynamic: Fixed typecheck

checkov/terraform/parser_functions.py

@@ -7,7 +7,12 @@
 
 from checkov.common.util.data_structures_utils import pickle_deepcopy
 from checkov.common.util.type_forcers import convert_str_to_bool
-from checkov.common.util.parser_utils import eval_string, split_merge_args, string_to_native, to_string
+from checkov.common.util.parser_utils import (
+    eval_string,
+    split_merge_args,
+    string_to_native,
+    to_string,
+)
 
 #
 # Functions defined in this file implement terraform functions.
@@ -121,7 +126,7 @@ def toset(original: str, **_: Any) -> set[Any] | str:
 
 def tomap(original: str, **_: Any) -> dict[Hashable, Any] | str:
     # https://www.terraform.io/docs/language/functions/tomap.html
-    original = original.replace(":", "=")     # converted to colons by parser #shrug
+    original = original.replace(":", "=")  # converted to colons by parser #shrug
 
     altered_value = eval_string(original)
     if altered_value is None or not isinstance(altered_value, dict):
@@ -136,7 +141,7 @@ def map(original: str, **_: Any) -> dict[Hashable, Any] | str:
     #       the issue, act like it's a list (to allow comma separation) and let the HCL
     #       parser deal with it. Then iterating the list is easy.
     converted_to_list = eval_string(f"[{original}]")
-    if converted_to_list is None or len(converted_to_list) & 1:       # none or odd number of args
+    if converted_to_list is None or len(converted_to_list) & 1:  # none or odd number of args
         return FUNCTION_FAILED
 
     return create_map(converted_to_list)
@@ -190,8 +195,13 @@ def handle_dynamic_values(conf: Dict[str, List[Any]], has_dynamic_block: bool =
 
 
 def process_dynamic_values(conf: Dict[str, List[Any]]) -> bool:
+    dynamic_conf: Union[List[Any], Dict[str, List[Any]]] = conf.get("dynamic", {})
+
+    if not isinstance(dynamic_conf, list):
+        return False
+
     has_dynamic_block = False
-    for dynamic_element in conf.get("dynamic", {}):
+    for dynamic_element in dynamic_conf:
         if isinstance(dynamic_element, str):
             try:
                 dynamic_element = json.loads(dynamic_element)