feat(awslambda): add secrets_ignore_files to skip false-positive files (e.g. *.deps.json) in no-secrets-in-code check (#11222)

Co-authored-by: Daniel Barranquero <danielbo2001@gmail.com>

tests/providers/aws/services/awslambda/awslambda_function_no_secrets_in_code/awslambda_function_no_secrets_in_code_test.py

@@ -1,3 +1,4 @@
+import os
 import zipfile
 from unittest import mock
 
@@ -53,6 +54,57 @@ def get_lambda_code_with_secrets(code):
     )
 
 
+LAMBDA_DEPS_JSON_WITH_SECRET = """
+{
+  "runtimeTarget": { "name": ".NETCoreApp,Version=v8.0" },
+  "libraries": {
+    "AWSSDK.SecretsManager/3.7.0": {
+      "type": "package",
+      "password": "test-deps-json-password"
+    }
+  }
+}
+"""
+
+LAMBDA_VENDOR_JS_WITH_SECRET = """
+const dbPassword = "test-vendor-password";
+"""
+
+
+def get_lambda_code_from_files(files: dict) -> LambdaCode:
+    # The check only calls code_zip.extractall(dir); mock it to drop the
+    # given files into the temporary directory the check creates, so no
+    # real archive needs to be built.
+    code_zip = mock.MagicMock()
+
+    def _extractall(path):
+        for name, content in files.items():
+            os.makedirs(os.path.dirname(f"{path}/{name}"), exist_ok=True)
+            with open(f"{path}/{name}", "w") as fd:
+                fd.write(content)
+
+    code_zip.extractall.side_effect = _extractall
+    return LambdaCode(location="", code_zip=code_zip)
+
+
+def mock_get_function_code_with_deps_json_secret():
+    yield create_lambda_function(), get_lambda_code_from_files(
+        {
+            "lambda_function.py": LAMBDA_FUNCTION_CODE_WITHOUT_SECRETS,
+            "myapp.deps.json": LAMBDA_DEPS_JSON_WITH_SECRET,
+        }
+    )
+
+
+def mock_get_function_code_with_nested_vendor_secret():
+    yield create_lambda_function(), get_lambda_code_from_files(
+        {
+            "lambda_function.py": LAMBDA_FUNCTION_CODE_WITHOUT_SECRETS,
+            "vendor/package.js": LAMBDA_VENDOR_JS_WITH_SECRET,
+        }
+    )
+
+
 def mock_get_function_codewith_secrets():
     yield create_lambda_function(), get_lambda_code_with_secrets(
         LAMBDA_FUNCTION_CODE_WITH_SECRETS
@@ -202,6 +254,133 @@ class Test_awslambda_function_no_secrets_in_code:
             )
             assert result[0].resource_tags == []
 
+    def test_function_code_deps_json_secret_not_ignored(self):
+        lambda_client = mock.MagicMock
+        lambda_client.functions = {LAMBDA_FUNCTION_ARN: create_lambda_function()}
+        lambda_client._get_function_code = mock_get_function_code_with_deps_json_secret
+        lambda_client.audit_config = {
+            "secrets_ignore_patterns": [],
+            "secrets_ignore_files": None,
+        }
+
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=set_mocked_aws_provider(),
+            ),
+            mock.patch(
+                "prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_code.awslambda_function_no_secrets_in_code.awslambda_client",
+                new=lambda_client,
+            ),
+        ):
+            from prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_code.awslambda_function_no_secrets_in_code import (
+                awslambda_function_no_secrets_in_code,
+            )
+
+            check = awslambda_function_no_secrets_in_code()
+            result = check.execute()
+
+            assert len(result) == 1
+            assert result[0].status == "FAIL"
+            assert "myapp.deps.json" in result[0].status_extended
+
+    def test_function_code_nested_vendor_secret_not_ignored(self):
+        lambda_client = mock.MagicMock
+        lambda_client.functions = {LAMBDA_FUNCTION_ARN: create_lambda_function()}
+        lambda_client._get_function_code = (
+            mock_get_function_code_with_nested_vendor_secret
+        )
+        lambda_client.audit_config = {"secrets_ignore_patterns": []}
+
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=set_mocked_aws_provider(),
+            ),
+            mock.patch(
+                "prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_code.awslambda_function_no_secrets_in_code.awslambda_client",
+                new=lambda_client,
+            ),
+        ):
+            from prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_code.awslambda_function_no_secrets_in_code import (
+                awslambda_function_no_secrets_in_code,
+            )
+
+            check = awslambda_function_no_secrets_in_code()
+            result = check.execute()
+
+            assert len(result) == 1
+            assert result[0].status == "FAIL"
+            assert "vendor/package.js" in result[0].status_extended
+
+    def test_function_code_nested_vendor_secret_ignored_by_file_pattern(self):
+        lambda_client = mock.MagicMock
+        lambda_client.functions = {LAMBDA_FUNCTION_ARN: create_lambda_function()}
+        lambda_client._get_function_code = (
+            mock_get_function_code_with_nested_vendor_secret
+        )
+        lambda_client.audit_config = {
+            "secrets_ignore_patterns": [],
+            "secrets_ignore_files": ["vendor/*.js"],
+        }
+
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=set_mocked_aws_provider(),
+            ),
+            mock.patch(
+                "prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_code.awslambda_function_no_secrets_in_code.awslambda_client",
+                new=lambda_client,
+            ),
+        ):
+            from prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_code.awslambda_function_no_secrets_in_code import (
+                awslambda_function_no_secrets_in_code,
+            )
+
+            check = awslambda_function_no_secrets_in_code()
+            result = check.execute()
+
+            assert len(result) == 1
+            assert result[0].status == "PASS"
+
+    def test_function_code_deps_json_secret_ignored_by_file_pattern(self):
+        lambda_client = mock.MagicMock
+        lambda_client.functions = {LAMBDA_FUNCTION_ARN: create_lambda_function()}
+        lambda_client._get_function_code = mock_get_function_code_with_deps_json_secret
+        lambda_client.audit_config = {
+            "secrets_ignore_patterns": [],
+            "secrets_ignore_files": ["*.deps.json"],
+        }
+
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=set_mocked_aws_provider(),
+            ),
+            mock.patch(
+                "prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_code.awslambda_function_no_secrets_in_code.awslambda_client",
+                new=lambda_client,
+            ),
+        ):
+            from prowler.providers.aws.services.awslambda.awslambda_function_no_secrets_in_code.awslambda_function_no_secrets_in_code import (
+                awslambda_function_no_secrets_in_code,
+            )
+
+            check = awslambda_function_no_secrets_in_code()
+            result = check.execute()
+
+            assert len(result) == 1
+            assert result[0].region == AWS_REGION_US_EAST_1
+            assert result[0].resource_id == LAMBDA_FUNCTION_NAME
+            assert result[0].resource_arn == LAMBDA_FUNCTION_ARN
+            assert result[0].status == "PASS"
+            assert (
+                result[0].status_extended
+                == f"No secrets found in Lambda function {LAMBDA_FUNCTION_NAME} code."
+            )
+            assert result[0].resource_tags == []
+
     def test_scan_failure_reports_manual_not_pass(self):
         from prowler.lib.utils.utils import SecretsScanError
 
@@ -209,6 +388,7 @@ class Test_awslambda_function_no_secrets_in_code:
         lambda_client.functions = {LAMBDA_FUNCTION_ARN: create_lambda_function()}
         lambda_client._get_function_code = mock_get_function_codewith_secrets
         lambda_client.audit_config = {"secrets_ignore_patterns": []}
+
         with (
             mock.patch(
                 "prowler.providers.common.provider.Provider.get_global_provider",