Client install roles added

roles/lmn_printer/files/linuxmusterLinuxclient7/keytab.py

@@ -0,0 +1,52 @@
+from krb5KeytabUtil import Krb5KeytabUtil
+from linuxmusterLinuxclient7 import computer, config, logging
+
+def patchKeytab():
+    """
+    Patches the `/etc/krb5.keytab` file. It inserts the correct hostname of the current computer.
+
+    :return: True on success, False otherwise
+    :rtype: bool
+    """
+    krb5KeytabFilePath = "/etc/krb5.keytab"
+    logging.info("Patching {}".format(krb5KeytabFilePath))
+    krb5KeytabUtil = Krb5KeytabUtil(krb5KeytabFilePath)
+
+    try:
+        krb5KeytabUtil.read()
+    except:
+        logging.error("Error reading {}".format(krb5KeytabFilePath))
+        return False
+
+    for entry in krb5KeytabUtil.keytab.entries:
+        oldData = entry.principal.components[-1].data
+        if len(entry.principal.components) == 1:
+            newData = computer.hostname().upper() + "$"
+            entry.principal.components[0].data = newData
+
+        elif len(entry.principal.components) == 2 and (entry.principal.components[0].data == "host" or entry.principal.components[0].data == "RestrictedKrbHost"):
+            rc, networkConfig = config.network()
+            if not rc:
+                continue
+
+            newData = ""
+            domain = networkConfig["domain"]
+            if domain in entry.principal.components[1].data:
+                newData = computer.hostname().lower() + "." + domain
+            else:
+                newData = computer.hostname().upper()
+
+            entry.principal.components[1].data = newData
+
+        logging.debug("{} was changed to {}".format(oldData, entry.principal.components[-1].data))
+    
+    logging.info("Trying to overwrite {}".format(krb5KeytabFilePath))
+    try:
+        result = krb5KeytabUtil.write()
+    except:
+        result = False
+
+    if not result:
+        logging.error("Error overwriting {}".format(krb5KeytabFilePath))
+    
+    return result