feat(terraform): add CKV_AWS_272 to validate Lambda function code-signing

checkov/terraform/checks/resource/aws/LambdaCodeSigningConfigured.py

@@ -0,0 +1,21 @@
+from checkov.common.models.consts import ANY_VALUE
+from checkov.terraform.checks.resource.base_resource_value_check import BaseResourceValueCheck
+from checkov.common.models.enums import CheckCategories
+
+
+class LambdaCodeSigningConfigured(BaseResourceValueCheck):
+    def __init__(self):
+        name = "Ensure AWS Lambda function is configured to validate code-signing"
+        id = "CKV_AWS_272"
+        supported_resources = ['aws_lambda_function']
+        categories = [CheckCategories.SUPPLY_CHAIN]
+        super().__init__(name=name, id=id, categories=categories, supported_resources=supported_resources)
+
+    def get_inspected_key(self):
+        return "code_signing_config_arn"
+
+    def get_expected_value(self):
+        return ANY_VALUE
+
+
+check = LambdaCodeSigningConfigured()

tests/terraform/checks/resource/aws/example_LambdaCodeSigningConfigured/main.tf

@@ -0,0 +1,16 @@
+# pass
+
+resource "aws_lambda_function" "pass" {
+  function_name = "test-env"
+  role          = ""
+  runtime       = "python3.8"
+  code_signing_config_arn = "123123123"
+}
+
+# fail
+
+resource "aws_lambda_function" "fail" {
+  function_name = "stest-env"
+  role          = ""
+  runtime       = "python3.8"
+}

tests/terraform/checks/resource/aws/test_LambdaCodeSigningConfigured.py

@@ -0,0 +1,41 @@
+import unittest
+from pathlib import Path
+
+from checkov.runner_filter import RunnerFilter
+from checkov.terraform.checks.resource.aws.LambdaCodeSigningConfigured import check
+from checkov.terraform.runner import Runner
+
+
+class TestWafHasAnyRules(unittest.TestCase):
+    def test(self):
+        # given
+        test_files_dir = Path(__file__).parent / "example_LambdaCodeSigningConfigured"
+
+        # when
+        report = Runner().run(root_folder=str(test_files_dir), runner_filter=RunnerFilter(checks=[check.id]))
+
+        # then
+        summary = report.get_summary()
+
+        passing_resources = {
+            "aws_lambda_function.pass"
+        }
+
+        failing_resources = {
+            "aws_lambda_function.fail"
+        }
+
+        passed_check_resources = {c.resource for c in report.passed_checks}
+        failed_check_resources = {c.resource for c in report.failed_checks}
+
+        self.assertEqual(summary["passed"], 1)
+        self.assertEqual(summary["failed"], 1)
+        self.assertEqual(summary["skipped"], 0)
+        self.assertEqual(summary["parsing_errors"], 0)
+
+        self.assertEqual(passing_resources, passed_check_resources)
+        self.assertEqual(failing_resources, failed_check_resources)
+
+
+if __name__ == "__main__":
+    unittest.main()