Fix GSSAPI packet data

Author: kesmit13

singlestoredb/mysql/_auth.py

@@ -2,8 +2,6 @@
 """
 Implements auth methods
 """
-import getpass
-
 from .err import OperationalError
 
 try:
@@ -276,7 +274,7 @@ def caching_sha2_password_auth(conn, pkt):
     pkt = _roundtrip(conn, data)
 
 
-def gssapi_auth(user):
+def gssapi_auth(data):
     try:
         import gssapi.raw
     except ImportError:
@@ -285,13 +283,10 @@ def gssapi_auth(user):
             'installed for Kerberos authentication',
         )
 
-    if not user:
-        user = getpass.getuser()
-
     ctx = None
     try:
         ctx = gssapi.raw.init_sec_context(
-            gssapi.raw.import_name(user, gssapi.raw.NameType.user),
+            gssapi.raw.import_name(data, gssapi.raw.NameType.user),
             flags=[0], lifetime=0,
         )
         return ctx.token

singlestoredb/mysql/connection.py

@@ -1111,9 +1111,6 @@ def _request_authentication(self):  # noqa: C901
                 authresp = b'\1'  # request public key
             else:
                 authresp = b'\0'  # empty password
-        elif self._auth_plugin_name == b'auth_gssapi_client':
-            plugin_name = b'auth_gssapi_client'
-            authresp = _auth.gssapi_auth(self.user)
 
         if self.server_capabilities & CLIENT.PLUGIN_AUTH_LENENC_CLIENT_DATA:
             data += _lenenc_int(len(authresp)) + authresp
@@ -1203,7 +1200,7 @@ def _process_auth(self, plugin_name, auth_packet):
             # https://dev.mysql.com/doc/internals/en/clear-text-authentication.html
             data = self.password + b'\0'
         elif plugin_name == b'auth_gssapi_client':
-            data = _auth.gssapi_auth(self.user)
+            data = _auth.gssapi_auth(auth_packet.read_all())
         elif plugin_name == b'dialog':
             pkt = auth_packet
             while True: