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https://github.com/jupyterhub/ldapauthenticator/blob/24f11eb5d2517d6a1bd9cc616653cc000a044811/ldapauthenticator/ldapauthenticator.py#L430
https://github.com/jupyterhub/ldapauthenticator/blob/1.3.2/ldapauthenticator/ldapauthenticator.py#L430:L448
When escape_userdn = True the ldapauthenticator escapes special chars in userdn but does not escapes special chars in username. This does not cause an issue when allowed_groups is null but it does cause an issue when allowed_groups is not null. I suggest that the username is also escaped when escape_userdn = True or add another parameter dedicated to escape username.
I am using: z2jh | 2.0.0 jupyterhub | 3.0.0 ldapauthenticator | 1.3.2
z2jh hub-pod logs: [D JupyterHub ldapauthenticator:256] Looking up user with: search_base = 'OU=AADDC Users,DC=xxxxxx,DC=com' search_filter = '(sAMAccountName=my_username)' attributes = 'sAMAccountName' [D ldapauthenticator:379] Attempting to bind My Full Name (6B4563DA) with CN=My Full Name \286B4563DA\29,OU=AADDC Users,DC=xxxxxx,DC=com [D ldapauthenticator:392] Status of user bind My Full Name (6B4563DA) with CN=My Full Name \286B4563DA\29,OU=AADDC Users,DC=xxxxxx,DC=com : True [D ldapauthenticator:431] username:My Full Name (6B4563DA) Using dn CN=My Full Name \286B4563DA\29,OU=AADDC Users,DC=xxxxxx,DC=com [E JupyterHub web:1798] Uncaught exception POST /hub/login?next=%2Fhub%2F (::ffff:xx.xx.xx.xx) HTTPServerRequest(protocol='http', host='xxx.xxx.xxx.xxx:3xxxx', method='POST', uri='/hub/login?next=%2Fhub%2F', version='HTTP/1.1', remote_ip='::ffff:xx.xx.xx.xx') Traceback (most recent call last): File "/usr/local/lib/python3.9/site-packages/tornado/web.py", line 1713, in _execute result = await result File "/usr/local/lib/python3.9/site-packages/jupyterhub/handlers/login.py", line 153, in post user = await self.login_user(data) File "/usr/local/lib/python3.9/site-packages/jupyterhub/handlers/base.py", line 801, in login_user authenticated = await self.authenticate(data) File "/usr/local/lib/python3.9/site-packages/jupyterhub/auth.py", line 491, in get_authenticated_user authenticated = await maybe_future(self.authenticate(handler, data)) File "/usr/local/lib/python3.9/site-packages/ldapauthenticator/ldapauthenticator.py", line 443, in authenticate found = conn.search( File "/usr/local/lib/python3.9/site-packages/ldap3/core/connection.py", line 838, in search request = search_operation(search_base, File "/usr/local/lib/python3.9/site-packages/ldap3/operation/search.py", line 371, in search_operation request['filter'] = compile_filter(parse_filter(search_filter, schema, auto_escape, auto_encode, validator, check_names).elements[0]) # parse the searchFilter string and compile it starting from the root node File "/usr/local/lib/python3.9/site-packages/ldap3/operation/search.py", line 214, in parse_filter raise LDAPInvalidFilterError('malformed filter') ldap3.core.exceptions.LDAPInvalidFilterError: malformed filter