$ python3 -m venv ldap3gssapitest$ cd ldap3gssapitest$ source bin/activate$ pip3 install ldap3 gssapi cryptography$ cat > search.py <<EOF#!/usr/bin/env python3from ldap3 import Server, Connection, Tls, SASL, KERBEROSimport ssltls = Tls(validate=ssl.CERT_NONE, version=ssl.PROTOCOL_TLSv1_2)server = Server('yourldapserver', use_ssl=True, tls=tls)c = Connection(        server, authentication=SASL, sasl_mechanism=KERBEROS)c.bind()print(c.extend.standard.who_am_i())EOF$ python3 search.pydn:uid=simlu,cn=gssapi,cn=auth

$ python3 search.pyTraceback (most recent call last):  File "/private/tmp/ldap3gssapitest/search.py", line 8, in <module>    c.bind()  File "/private/tmp/ldap3gssapitest/lib/python3.9/site-packages/ldap3/core/connection.py", line 608, in bind    response = self.do_sasl_bind(controls)  File "/private/tmp/ldap3gssapitest/lib/python3.9/site-packages/ldap3/core/connection.py", line 1336, in do_sasl_bind    result = sasl_gssapi(self, controls)  File "/private/tmp/ldap3gssapitest/lib/python3.9/site-packages/ldap3/protocol/sasl/kerberos.py", line 118, in sasl_gssapi    out_token = ctx.step(in_token)  File "<decorator-gen-15>", line 2, in step  File "/private/tmp/ldap3gssapitest/lib/python3.9/site-packages/gssapi/_utils.py", line 155, in check_last_err    return func(self, *args, **kwargs)  File "<decorator-gen-5>", line 2, in step  File "/private/tmp/ldap3gssapitest/lib/python3.9/site-packages/gssapi/_utils.py", line 128, in catch_and_return_token    return func(self, *args, **kwargs)  File "/private/tmp/ldap3gssapitest/lib/python3.9/site-packages/gssapi/sec_contexts.py", line 519, in step    return self._initiator_step(token=token)  File "/private/tmp/ldap3gssapitest/lib/python3.9/site-packages/gssapi/sec_contexts.py", line 535, in _initiator_step    res = rsec_contexts.init_sec_context(self._target_name, self._creds,  File "gssapi/raw/sec_contexts.pyx", line 245, in gssapi.raw.sec_contexts.init_sec_contextgssapi.raw.exceptions.MalformedParameterError: Major (51183616): A parameter was malformed Miscellaneous failure (see text), Minor (0): Success$

$ pip3 freezecffi==1.14.4cryptography==3.3.1decorator==4.4.2gssapi==1.6.12ldap3==2.8.1pyasn1==0.4.8pycparser==2.20six==1.15.0$ pacman -Qi krb5 | grep VersionVersion         : 1.18.2-1