refactor(m365): extract error handling to _process_error method with override pattern

- Create _process_error() method in base PowerShellSession class with generic
  error messaging for missing cmdlets
- Add @override _process_error() in M365PowerShell class with M365-specific
  messaging about Microsoft Defender for Office 365 licensing
- Update changelog with defender_safelinks_policy_enabled entry in v5.18.0

prowler/CHANGELOG.md

@@ -8,6 +8,7 @@ All notable changes to the **Prowler SDK** are documented in this file.
 
 - `compute_instance_suspended_without_persistent_disks` check for GCP provider [(#9747)](https://github.com/prowler-cloud/prowler/pull/9747)
 - `codebuild_project_webhook_filters_use_anchored_patterns` check for AWS provider to detect CodeBreach vulnerability [(#9840)](https://github.com/prowler-cloud/prowler/pull/9840)
+- `defender_safelinks_policy_enabled` check for M365 provider [(#9832)](https://github.com/prowler-cloud/prowler/pull/9832)
 
 ### Changed
 

prowler/lib/powershell/powershell.py

@@ -193,10 +193,30 @@ class PowerShellSession:
             result = default
 
         if error_result:
-            logger.error(f"PowerShell error output: {error_result}")
+            self._process_error(error_result)
 
         return result
 
+    def _process_error(self, error_result: str) -> None:
+        """
+        Process PowerShell error output.
+
+        This method handles error output from PowerShell commands.
+        Subclasses can override this to provide integration-specific error handling.
+
+        Args:
+            error_result (str): The error output from PowerShell.
+        """
+        if "is not recognized as a name of a cmdlet" in error_result:
+            cmdlet_match = re.search(r"'([^']+)'.*is not recognized", error_result)
+            cmdlet_name = cmdlet_match.group(1) if cmdlet_match else "Unknown"
+            logger.warning(
+                f"PowerShell cmdlet '{cmdlet_name}' is not available. "
+                f"This may indicate missing modules or insufficient permissions."
+            )
+        else:
+            logger.error(f"PowerShell error output: {error_result}")
+
     def json_parse_output(self, output: str) -> dict:
         """
         Parse command execution output to JSON format.

prowler/providers/m365/lib/powershell/m365_powershell.py

@@ -1,4 +1,7 @@
 import os
+import re
+
+from typing_extensions import override
 
 from prowler.lib.logger import logger
 from prowler.lib.powershell.powershell import PowerShellSession
@@ -46,6 +49,28 @@ class M365PowerShell(PowerShellSession):
         self.tenant_identity = identity
         self.init_credential(credentials)
 
+    @override
+    def _process_error(self, error_result: str) -> None:
+        """
+        Process PowerShell error output with M365-specific context.
+
+        Provides Microsoft 365 specific error messaging, particularly for
+        cmdlets that require Microsoft Defender for Office 365 licensing.
+
+        Args:
+            error_result (str): The error output from PowerShell.
+        """
+        if "is not recognized as a name of a cmdlet" in error_result:
+            cmdlet_match = re.search(r"'([^']+)'.*is not recognized", error_result)
+            cmdlet_name = cmdlet_match.group(1) if cmdlet_match else "Unknown"
+            logger.warning(
+                f"PowerShell cmdlet '{cmdlet_name}' is not available. "
+                f"This may indicate missing licensing (e.g., Microsoft Defender for Office 365) "
+                f"or insufficient permissions. Related checks will be skipped."
+            )
+        else:
+            logger.error(f"PowerShell error output: {error_result}")
+
     def clean_certificate_content(self, cert_content: str) -> str:
         """
         Clean certificate content for PowerShell consumption.