doc: add FAST documentation

Author: gpotter2

doc/scapy/layers/kerberos.rst

@@ -41,11 +41,11 @@ This section tries to give many usage examples, but isn't exhaustive. For more d
     >>> t.show()
     Tickets:
     0. [email protected] -> krbtgt/[email protected]
-    Start time         End time           Renew until        Auth time        
+    Start time         End time           Renew until        Auth time
     31/08/23 11:38:34  31/08/23 21:38:34  31/08/23 21:38:35  31/08/23 01:38:34
 
     1. [email protected] -> host/[email protected]
-    Start time         End time           Renew until        Auth time        
+    Start time         End time           Renew until        Auth time
     31/08/23 11:39:07  31/08/23 21:38:34  31/08/23 21:38:35  31/08/23 01:38:34
 
 
@@ -80,12 +80,29 @@ This section tries to give many usage examples, but isn't exhaustive. For more d
     >>> # One could also have used a different cert and key file:
     >>> t.request_tgt("[email protected]", x509="admin.cert", x509key="admin.key", ca="ca.pem")
 
+- **Request a user TGT with Kerberos armoring (FAST)**
+
+The ``armor_with`` keyword allows to select a ticket to armor the request with.
+
+.. code:: pycon
+
+    >>> load_module("ticketer")
+    >>> t = Ticketer()
+    >>> t.request_tgt("[email protected]", key=Key(EncryptionType.RC4_HMAC, bytes.fromhex("2b576acbe6bcfda7294d6bd18041b8fe")))
+    >>> t.show()
+    Tickets:
+    0. [email protected] -> krbtgt/[email protected]
+    Start time         End time           Renew until        Auth time
+    31/08/23 11:38:34  31/08/23 21:38:34  31/08/23 21:38:35  31/08/23 01:38:34
+    >>> t.request_tgt("[email protected]", armor_with=0)  # Armor with ticket n°0
+
 - **Renew a TGT or ST**:
 
 .. code::
 
     >>> t.renew(0)  # renew TGT
     >>> t.renew(1)  # renew ST. Works only with 'host/' SPNs
+    >>> t.renew(1, armor_with=0)  # renew something with armoring
 
 - **Import tickets from a ccache**: