fix(sharepoint): false positives on disabled external sharing (#9325)

Co-authored-by: Hugo Pereira Brito <101209179+HugoPBrito@users.noreply.github.com>

tests/providers/m365/services/sharepoint/sharepoint_external_sharing_managed/sharepoint_external_sharing_managed_test.py

@@ -55,6 +55,53 @@ class Test_sharepoint_external_sharing_managed:
             assert result[0].resource_name == "SharePoint Settings"
             assert result[0].resource == sharepoint_client.settings.dict()
 
+    def test_external_sharing_disabled(self):
+        """
+        Test when external sharing is disabled at organization level:
+        The check should PASS since domain restrictions are not applicable.
+        """
+        sharepoint_client = mock.MagicMock
+
+        with (
+            mock.patch(
+                "prowler.providers.common.provider.Provider.get_global_provider",
+                return_value=set_mocked_m365_provider(),
+            ),
+            mock.patch("prowler.providers.m365.lib.service.service.M365PowerShell"),
+            mock.patch(
+                "prowler.providers.m365.services.sharepoint.sharepoint_external_sharing_managed.sharepoint_external_sharing_managed.sharepoint_client",
+                new=sharepoint_client,
+            ),
+        ):
+            from prowler.providers.m365.services.sharepoint.sharepoint_external_sharing_managed.sharepoint_external_sharing_managed import (
+                sharepoint_external_sharing_managed,
+            )
+
+            sharepoint_client.settings = SharePointSettings(
+                sharingCapability="Disabled",
+                sharingAllowedDomainList=[],
+                sharingBlockedDomainList=[],
+                legacyAuth=True,
+                resharingEnabled=False,
+                sharingDomainRestrictionMode="none",
+                allowedDomainGuidsForSyncApp=[uuid.uuid4()],
+            )
+            sharepoint_client.tenant_domain = DOMAIN
+
+            check = sharepoint_external_sharing_managed()
+            result = check.execute()
+
+            assert len(result) == 1
+            assert result[0].status == "PASS"
+            assert (
+                result[0].status_extended
+                == "External sharing is disabled at organization level."
+            )
+            assert result[0].resource_id == "sharepointSettings"
+            assert result[0].location == "global"
+            assert result[0].resource_name == "SharePoint Settings"
+            assert result[0].resource == sharepoint_client.settings.dict()
+
     def test_allow_list_empty(self):
         """
         Test when sharingDomainRestrictionMode is "allowList" but AllowedDomainList is empty: