diff --git a/.gitlab/ci/test.gitlab-ci.yml b/.gitlab/ci/test.gitlab-ci.yml
index f146442e4..a9e14b6e4 100644
--- a/.gitlab/ci/test.gitlab-ci.yml
+++ b/.gitlab/ci/test.gitlab-ci.yml
@@ -181,3 +181,12 @@ test-service:
   only:
     changes:
       - src/yunohost/service.py
+
+test-ldapauth:
+  extends: .test-stage
+  script:
+    - cd src/yunohost
+    - python3 -m pytest tests/test_ldapauth.py
+  only:
+    changes:
+      - src/yunohost/authenticators/*.py
diff --git a/data/actionsmap/yunohost.yml b/data/actionsmap/yunohost.yml
index 00685b361..39a5f6758 100644
--- a/data/actionsmap/yunohost.yml
+++ b/data/actionsmap/yunohost.yml
@@ -33,18 +33,10 @@
 #     Global parameters     #
 #############################
 _global:
-    configuration:
-        authenticate:
-            - api
-        authenticator:
-            default:
-                vendor: ldap
-                help: admin_password
-                parameters:
-                    uri: ldap://localhost:389
-                    base_dn: dc=yunohost,dc=org
-                    user_rdn: cn=admin,dc=yunohost,dc=org
-        argument_auth: false
+    name: yunohost.admin
+    authentication:
+        api: ldap_admin
+        cli: null
     arguments:
         -v:
             full: --version
@@ -1402,9 +1394,9 @@ tools:
         postinstall:
             action_help: YunoHost post-install
             api: POST /postinstall
-            configuration:
+            authentication:
                 # We need to be able to run the postinstall without being authenticated, otherwise we can't run the postinstall
-                authenticate: false
+                api: null
             arguments:
                 -d:
                     full: --domain
diff --git a/debian/control b/debian/control
index 37eccb5dd..2e101dca3 100644
--- a/debian/control
+++ b/debian/control
@@ -14,7 +14,7 @@ Depends: ${python3:Depends}, ${misc:Depends}
  , python3-psutil, python3-requests, python3-dnspython, python3-openssl
  , python3-miniupnpc, python3-dbus, python3-jinja2
  , python3-toml, python3-packaging, python3-publicsuffix,
- , python3-zeroconf,
+ , python3-ldap, python3-zeroconf,
  , apt, apt-transport-https, apt-utils, dirmngr
  , php7.3-common, php7.3-fpm, php7.3-ldap, php7.3-intl
  , mariadb-server, php7.3-mysql
diff --git a/locales/en.json b/locales/en.json
index 3a5c8f054..8e3e8d839 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -372,6 +372,8 @@
     "invalid_regex": "Invalid regex:'{regex}'",
     "ip6tables_unavailable": "You cannot play with ip6tables here. You are either in a container or your kernel does not support it",
     "iptables_unavailable": "You cannot play with iptables here. You are either in a container or your kernel does not support it",
+    "ldap_server_down": "Unable to reach LDAP server",
+    "ldap_server_is_down_restart_it": "The LDAP service is down, attempt to restart it...",
     "log_corrupted_md_file": "The YAML metadata file associated with logs is damaged: '{md_file}\nError: {error}'",
     "log_link_to_log": "Full log of this operation: '<a href=\"#/tools/logs/{name}\" style=\"text-decoration:underline\">{desc}</a>'",
     "log_help_to_get_log": "To view the log of the operation '{desc}', use the command 'yunohost log show {name}{name}'",
@@ -479,6 +481,7 @@
     "migrations_to_be_ran_manually":  "Migration {id} has to be run manually. Please go to Tools → Migrations on the webadmin page, or run `yunohost tools migrations run`.",
     "not_enough_disk_space": "Not enough free space on '{path}'",
     "invalid_number": "Must be a number",
+    "invalid_password": "Invalid password",
     "operation_interrupted": "The operation was manually interrupted?",
     "packages_upgrade_failed": "Could not upgrade all the packages",
     "password_listed": "This password is among the most used passwords in the world. Please choose something more unique.",
diff --git a/src/yunohost/app.py b/src/yunohost/app.py
index 490368a15..877ee9cdc 100644
--- a/src/yunohost/app.py
+++ b/src/yunohost/app.py
@@ -36,7 +36,7 @@ import urllib.parse
 import tempfile
 from collections import OrderedDict
 
-from moulinette import msignals, m18n, msettings
+from moulinette import Moulinette, m18n
 from moulinette.core import MoulinetteError
 from moulinette.utils.log import getActionLogger
 from moulinette.utils.network import download_json
@@ -649,7 +649,7 @@ def app_upgrade(app=[], url=None, file=None, force=False, no_safety_backup=False
                     m18n.n("app_upgrade_failed", app=app_instance_name, error=error)
                 )
                 failure_message_with_debug_instructions = operation_logger.error(error)
-                if msettings.get("interface") != "api":
+                if Moulinette.interface.type != "api":
                     dump_app_log_extract_for_debugging(operation_logger)
         # Script got manually interrupted ... N.B. : KeyboardInterrupt does not inherit from Exception
         except (KeyboardInterrupt, EOFError):
@@ -827,11 +827,11 @@ def app_install(
     def confirm_install(confirm):
         # Ignore if there's nothing for confirm (good quality app), if --force is used
         # or if request on the API (confirm already implemented on the API side)
-        if confirm is None or force or msettings.get("interface") == "api":
+        if confirm is None or force or Moulinette.interface.type == "api":
             return
 
         if confirm in ["danger", "thirdparty"]:
-            answer = msignals.prompt(
+            answer = Moulinette.prompt(
                 m18n.n("confirm_app_install_" + confirm, answers="Yes, I understand"),
                 color="red",
             )
@@ -839,7 +839,7 @@ def app_install(
                 raise YunohostError("aborting")
 
         else:
-            answer = msignals.prompt(
+            answer = Moulinette.prompt(
                 m18n.n("confirm_app_install_" + confirm, answers="Y/N"), color="yellow"
             )
             if answer.upper() != "Y":
@@ -1015,7 +1015,7 @@ def app_install(
             error = m18n.n("app_install_script_failed")
             logger.error(m18n.n("app_install_failed", app=app_id, error=error))
             failure_message_with_debug_instructions = operation_logger.error(error)
-            if msettings.get("interface") != "api":
+            if Moulinette.interface.type != "api":
                 dump_app_log_extract_for_debugging(operation_logger)
     # Script got manually interrupted ... N.B. : KeyboardInterrupt does not inherit from Exception
     except (KeyboardInterrupt, EOFError):
@@ -2741,7 +2741,7 @@ class YunoHostArgumentFormatParser(object):
             )
 
             try:
-                question.value = msignals.prompt(
+                question.value = Moulinette.prompt(
                     text_for_user_input_in_cli, self.hide_user_input_in_prompt
                 )
             except NotImplementedError:
diff --git a/src/yunohost/authenticators/ldap_admin.py b/src/yunohost/authenticators/ldap_admin.py
new file mode 100644
index 000000000..dd6eec03e
--- /dev/null
+++ b/src/yunohost/authenticators/ldap_admin.py
@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+
+import os
+import logging
+import ldap
+import ldap.sasl
+import time
+
+from moulinette import m18n
+from moulinette.authentication import BaseAuthenticator
+from yunohost.utils.error import YunohostError
+
+logger = logging.getLogger("yunohost.authenticators.ldap_admin")
+
+class Authenticator(BaseAuthenticator):
+
+    name = "ldap_admin"
+
+    def __init__(self, *args, **kwargs):
+        self.uri = "ldap://localhost:389"
+        self.basedn = "dc=yunohost,dc=org"
+        self.admindn = "cn=admin,dc=yunohost,dc=org"
+
+    def _authenticate_credentials(self, credentials=None):
+
+        # TODO : change authentication format
+        # to support another dn to support multi-admins
+
+        def _reconnect():
+            con = ldap.ldapobject.ReconnectLDAPObject(
+                self.uri, retry_max=10, retry_delay=0.5
+            )
+            con.simple_bind_s(self.admindn, credentials)
+            return con
+
+        try:
+            con = _reconnect()
+        except ldap.INVALID_CREDENTIALS:
+            raise YunohostError("invalid_password")
+        except ldap.SERVER_DOWN:
+            # ldap is down, attempt to restart it before really failing
+            logger.warning(m18n.n("ldap_server_is_down_restart_it"))
+            os.system("systemctl restart slapd")
+            time.sleep(10)  # waits 10 secondes so we are sure that slapd has restarted
+
+            try:
+                con = _reconnect()
+            except ldap.SERVER_DOWN:
+                raise YunohostError("ldap_server_down")
+
+        # Check that we are indeed logged in with the expected identity
+        try:
+            # whoami_s return dn:..., then delete these 3 characters
+            who = con.whoami_s()[3:]
+        except Exception as e:
+            logger.warning("Error during ldap authentication process: %s", e)
+            raise
+        else:
+            if who != self.admindn:
+                raise YunohostError(f"Not logged with the appropriate identity ? Found {who}, expected {self.admindn} !?", raw_msg=True)
+        finally:
+            # Free the connection, we don't really need it to keep it open as the point is only to check authentication...
+            if con:
+                con.unbind_s()
diff --git a/src/yunohost/backup.py b/src/yunohost/backup.py
index ecc5ae033..09b35cb67 100644
--- a/src/yunohost/backup.py
+++ b/src/yunohost/backup.py
@@ -38,7 +38,7 @@ from collections import OrderedDict
 from functools import reduce
 from packaging import version
 
-from moulinette import msignals, m18n, msettings
+from moulinette import Moulinette, m18n
 from moulinette.utils import filesystem
 from moulinette.utils.log import getActionLogger
 from moulinette.utils.filesystem import read_file, mkdir, write_to_yaml, read_yaml
@@ -1509,7 +1509,7 @@ class RestoreManager:
                     m18n.n("app_restore_failed", app=app_instance_name, error=error)
                 )
                 failure_message_with_debug_instructions = operation_logger.error(error)
-                if msettings.get("interface") != "api":
+                if Moulinette.interface.type != "api":
                     dump_app_log_extract_for_debugging(operation_logger)
         # Script got manually interrupted ... N.B. : KeyboardInterrupt does not inherit from Exception
         except (KeyboardInterrupt, EOFError):
@@ -1840,7 +1840,7 @@ class BackupMethod(object):
         # Ask confirmation for copying
         if size > MB_ALLOWED_TO_ORGANIZE:
             try:
-                i = msignals.prompt(
+                i = Moulinette.prompt(
                     m18n.n(
                         "backup_ask_for_copying_if_needed",
                         answers="y/N",
@@ -2344,7 +2344,7 @@ def backup_restore(name, system=[], apps=[], force=False):
         if not force:
             try:
                 # Ask confirmation for restoring
-                i = msignals.prompt(
+                i = Moulinette.prompt(
                     m18n.n("restore_confirm_yunohost_installed", answers="y/N")
                 )
             except NotImplemented:
@@ -2418,7 +2418,7 @@ def backup_list(with_info=False, human_readable=False):
 
 def backup_download(name):
 
-    if msettings.get("interface") != "api":
+    if Moulinette.interface.type != "api":
         logger.error(
             "This option is only meant for the API/webadmin and doesn't make sense for the command line."
         )
diff --git a/src/yunohost/diagnosis.py b/src/yunohost/diagnosis.py
index ff1a14c4e..4ac5e2731 100644
--- a/src/yunohost/diagnosis.py
+++ b/src/yunohost/diagnosis.py
@@ -28,7 +28,7 @@ import re
 import os
 import time
 
-from moulinette import m18n, msettings
+from moulinette import m18n, Moulinette
 from moulinette.utils import log
 from moulinette.utils.filesystem import (
     read_json,
@@ -138,7 +138,7 @@ def diagnosis_show(
         url = yunopaste(content)
 
         logger.info(m18n.n("log_available_on_yunopaste", url=url))
-        if msettings.get("interface") == "api":
+        if Moulinette.interface.type == "api":
             return {"url": url}
         else:
             return
@@ -219,7 +219,7 @@ def diagnosis_run(
 
     if email:
         _email_diagnosis_issues()
-    if issues and msettings.get("interface") == "cli":
+    if issues and Moulinette.interface.type == "cli":
         logger.warning(m18n.n("diagnosis_display_tip"))
 
 
@@ -595,7 +595,7 @@ class Diagnoser:
                 info[1].update(meta_data)
                 s = m18n.n(info[0], **(info[1]))
                 # In cli, we remove the html tags
-                if msettings.get("interface") != "api" or force_remove_html_tags:
+                if Moulinette.interface.type != "api" or force_remove_html_tags:
                     s = s.replace("<cmd>", "'").replace("</cmd>", "'")
                     s = html_tags.sub("", s.replace("<br>", "\n"))
                 else:
diff --git a/src/yunohost/domain.py b/src/yunohost/domain.py
index 09d419c71..3bc70c424 100644
--- a/src/yunohost/domain.py
+++ b/src/yunohost/domain.py
@@ -26,7 +26,7 @@
 import os
 import re
 
-from moulinette import m18n, msettings, msignals
+from moulinette import m18n, Moulinette
 from moulinette.core import MoulinetteError
 from yunohost.utils.error import YunohostError, YunohostValidationError
 from moulinette.utils.log import getActionLogger
@@ -241,8 +241,8 @@ def domain_remove(operation_logger, domain, remove_apps=False, force=False):
 
     if apps_on_that_domain:
         if remove_apps:
-            if msettings.get("interface") == "cli" and not force:
-                answer = msignals.prompt(
+            if Moulinette.interface.type == "cli" and not force:
+                answer = Moulinette.prompt(
                     m18n.n(
                         "domain_remove_confirm_apps_removal",
                         apps="\n".join([x[1] for x in apps_on_that_domain]),
@@ -348,7 +348,7 @@ def domain_dns_conf(domain, ttl=None):
             for record in record_list:
                 result += "\n{name} {ttl} IN {type} {value}".format(**record)
 
-    if msettings.get("interface") == "cli":
+    if Moulinette.interface.type == "cli":
         logger.info(m18n.n("domain_dns_conf_is_just_a_recommendation"))
 
     return result
diff --git a/src/yunohost/hook.py b/src/yunohost/hook.py
index 33f5885e2..0594a27ae 100644
--- a/src/yunohost/hook.py
+++ b/src/yunohost/hook.py
@@ -31,7 +31,7 @@ import mimetypes
 from glob import iglob
 from importlib import import_module
 
-from moulinette import m18n, msettings
+from moulinette import m18n, Moulinette
 from yunohost.utils.error import YunohostError, YunohostValidationError
 from moulinette.utils import log
 from moulinette.utils.filesystem import read_json
@@ -416,7 +416,7 @@ def _hook_exec_bash(path, args, chdir, env, user, return_format, loggers):
         env = {}
     env["YNH_CWD"] = chdir
 
-    env["YNH_INTERFACE"] = msettings.get("interface")
+    env["YNH_INTERFACE"] = Moulinette.interface.type
 
     stdreturn = os.path.join(tempfile.mkdtemp(), "stdreturn")
     with open(stdreturn, "w") as f:
diff --git a/src/yunohost/log.py b/src/yunohost/log.py
index f10ade23d..9f61b1eed 100644
--- a/src/yunohost/log.py
+++ b/src/yunohost/log.py
@@ -33,7 +33,7 @@ import psutil
 from datetime import datetime, timedelta
 from logging import FileHandler, getLogger, Formatter
 
-from moulinette import m18n, msettings
+from moulinette import m18n, Moulinette
 from moulinette.core import MoulinetteError
 from yunohost.utils.error import YunohostError, YunohostValidationError
 from yunohost.utils.packages import get_ynh_package_version
@@ -44,7 +44,6 @@ CATEGORIES_PATH = "/var/log/yunohost/categories/"
 OPERATIONS_PATH = "/var/log/yunohost/categories/operation/"
 METADATA_FILE_EXT = ".yml"
 LOG_FILE_EXT = ".log"
-RELATED_CATEGORIES = ["app", "domain", "group", "service", "user"]
 
 logger = getActionLogger("yunohost.log")
 
@@ -125,7 +124,7 @@ def log_list(limit=None, with_details=False, with_suboperations=False):
     operations = list(reversed(sorted(operations, key=lambda o: o["name"])))
     # Reverse the order of log when in cli, more comfortable to read (avoid
     # unecessary scrolling)
-    is_api = msettings.get("interface") == "api"
+    is_api = Moulinette.interface.type == "api"
     if not is_api:
         operations = list(reversed(operations))
 
@@ -214,7 +213,7 @@ def log_show(
         url = yunopaste(content)
 
         logger.info(m18n.n("log_available_on_yunopaste", url=url))
-        if msettings.get("interface") == "api":
+        if Moulinette.interface.type == "api":
             return {"url": url}
         else:
             return
@@ -609,7 +608,7 @@ class OperationLogger(object):
             "operation": self.operation,
             "parent": self.parent,
             "yunohost_version": get_ynh_package_version("yunohost")["version"],
-            "interface": msettings.get("interface"),
+            "interface": Moulinette.interface.type,
         }
         if self.related_to is not None:
             data["related_to"] = self.related_to
@@ -663,7 +662,7 @@ class OperationLogger(object):
             self.logger.removeHandler(self.file_handler)
             self.file_handler.close()
 
-        is_api = msettings.get("interface") == "api"
+        is_api = Moulinette.interface.type == "api"
         desc = _get_description_from_name(self.name)
         if error is None:
             if is_api:
diff --git a/src/yunohost/tests/conftest.py b/src/yunohost/tests/conftest.py
index 49f87decf..9dfe2b39c 100644
--- a/src/yunohost/tests/conftest.py
+++ b/src/yunohost/tests/conftest.py
@@ -3,7 +3,7 @@ import pytest
 import sys
 
 import moulinette
-from moulinette import m18n, msettings
+from moulinette import m18n, Moulinette
 from yunohost.utils.error import YunohostError
 from contextlib import contextmanager
 
@@ -81,4 +81,11 @@ def pytest_cmdline_main(config):
     import yunohost
 
     yunohost.init(debug=config.option.yunodebug)
-    msettings["interface"] = "test"
+    class DummyInterface():
+
+        type = "test"
+
+        def prompt(*args, **kwargs):
+            raise NotImplementedError
+
+    Moulinette._interface = DummyInterface()
diff --git a/src/yunohost/tests/test_apps_arguments_parsing.py b/src/yunohost/tests/test_apps_arguments_parsing.py
index 95d1548ae..573c18cb2 100644
--- a/src/yunohost/tests/test_apps_arguments_parsing.py
+++ b/src/yunohost/tests/test_apps_arguments_parsing.py
@@ -5,7 +5,7 @@ from mock import patch
 from io import StringIO
 from collections import OrderedDict
 
-from moulinette import msignals
+from moulinette import Moulinette
 
 from yunohost import domain, user
 from yunohost.app import _parse_args_in_yunohost_format, PasswordArgumentParser
@@ -84,7 +84,7 @@ def test_parse_args_in_yunohost_format_string_input():
     answers = {}
     expected_result = OrderedDict({"some_string": ("some_value", "string")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -97,7 +97,7 @@ def test_parse_args_in_yunohost_format_string_input_no_ask():
     answers = {}
     expected_result = OrderedDict({"some_string": ("some_value", "string")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -124,7 +124,7 @@ def test_parse_args_in_yunohost_format_string_optional_with_input():
     answers = {}
     expected_result = OrderedDict({"some_string": ("some_value", "string")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -139,7 +139,7 @@ def test_parse_args_in_yunohost_format_string_optional_with_empty_input():
     answers = {}
     expected_result = OrderedDict({"some_string": ("", "string")})
 
-    with patch.object(msignals, "prompt", return_value=""):
+    with patch.object(Moulinette.interface, "prompt", return_value=""):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -153,7 +153,7 @@ def test_parse_args_in_yunohost_format_string_optional_with_input_without_ask():
     answers = {}
     expected_result = OrderedDict({"some_string": ("some_value", "string")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -180,7 +180,7 @@ def test_parse_args_in_yunohost_format_string_input_test_ask():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with(ask_text, False)
 
@@ -197,7 +197,7 @@ def test_parse_args_in_yunohost_format_string_input_test_ask_with_default():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with("%s (default: %s)" % (ask_text, default_text), False)
 
@@ -215,7 +215,7 @@ def test_parse_args_in_yunohost_format_string_input_test_ask_with_example():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
         assert example_text in prompt.call_args[0][0]
@@ -234,7 +234,7 @@ def test_parse_args_in_yunohost_format_string_input_test_ask_with_help():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
         assert help_text in prompt.call_args[0][0]
@@ -251,7 +251,7 @@ def test_parse_args_in_yunohost_format_string_with_choice_prompt():
     questions = [{"name": "some_string", "type": "string", "choices": ["fr", "en"]}]
     answers = {"some_string": "fr"}
     expected_result = OrderedDict({"some_string": ("fr", "string")})
-    with patch.object(msignals, "prompt", return_value="fr"):
+    with patch.object(Moulinette.interface, "prompt", return_value="fr"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -275,7 +275,7 @@ def test_parse_args_in_yunohost_format_string_with_choice_ask():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="ru") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="ru") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
 
@@ -333,7 +333,7 @@ def test_parse_args_in_yunohost_format_password_input():
     answers = {}
     expected_result = OrderedDict({"some_password": ("some_value", "password")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -347,7 +347,7 @@ def test_parse_args_in_yunohost_format_password_input_no_ask():
     answers = {}
     expected_result = OrderedDict({"some_password": ("some_value", "password")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -383,7 +383,7 @@ def test_parse_args_in_yunohost_format_password_optional_with_input():
     answers = {}
     expected_result = OrderedDict({"some_password": ("some_value", "password")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -399,7 +399,7 @@ def test_parse_args_in_yunohost_format_password_optional_with_empty_input():
     answers = {}
     expected_result = OrderedDict({"some_password": ("", "password")})
 
-    with patch.object(msignals, "prompt", return_value=""):
+    with patch.object(Moulinette.interface, "prompt", return_value=""):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -414,7 +414,7 @@ def test_parse_args_in_yunohost_format_password_optional_with_input_without_ask(
     answers = {}
     expected_result = OrderedDict({"some_password": ("some_value", "password")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -462,7 +462,7 @@ def test_parse_args_in_yunohost_format_password_input_test_ask():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with(ask_text, True)
 
@@ -481,7 +481,7 @@ def test_parse_args_in_yunohost_format_password_input_test_ask_with_example():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
         assert example_text in prompt.call_args[0][0]
@@ -501,7 +501,7 @@ def test_parse_args_in_yunohost_format_password_input_test_ask_with_help():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
         assert help_text in prompt.call_args[0][0]
@@ -594,7 +594,7 @@ def test_parse_args_in_yunohost_format_path_input():
     answers = {}
     expected_result = OrderedDict({"some_path": ("some_value", "path")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -608,7 +608,7 @@ def test_parse_args_in_yunohost_format_path_input_no_ask():
     answers = {}
     expected_result = OrderedDict({"some_path": ("some_value", "path")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -637,7 +637,7 @@ def test_parse_args_in_yunohost_format_path_optional_with_input():
     answers = {}
     expected_result = OrderedDict({"some_path": ("some_value", "path")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -653,7 +653,7 @@ def test_parse_args_in_yunohost_format_path_optional_with_empty_input():
     answers = {}
     expected_result = OrderedDict({"some_path": ("", "path")})
 
-    with patch.object(msignals, "prompt", return_value=""):
+    with patch.object(Moulinette.interface, "prompt", return_value=""):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -668,7 +668,7 @@ def test_parse_args_in_yunohost_format_path_optional_with_input_without_ask():
     answers = {}
     expected_result = OrderedDict({"some_path": ("some_value", "path")})
 
-    with patch.object(msignals, "prompt", return_value="some_value"):
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -697,7 +697,7 @@ def test_parse_args_in_yunohost_format_path_input_test_ask():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with(ask_text, False)
 
@@ -715,7 +715,7 @@ def test_parse_args_in_yunohost_format_path_input_test_ask_with_default():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with("%s (default: %s)" % (ask_text, default_text), False)
 
@@ -734,7 +734,7 @@ def test_parse_args_in_yunohost_format_path_input_test_ask_with_example():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
         assert example_text in prompt.call_args[0][0]
@@ -754,7 +754,7 @@ def test_parse_args_in_yunohost_format_path_input_test_ask_with_help():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="some_value") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="some_value") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
         assert help_text in prompt.call_args[0][0]
@@ -918,11 +918,11 @@ def test_parse_args_in_yunohost_format_boolean_input():
     answers = {}
 
     expected_result = OrderedDict({"some_boolean": (1, "boolean")})
-    with patch.object(msignals, "prompt", return_value="y"):
+    with patch.object(Moulinette.interface, "prompt", return_value="y"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
     expected_result = OrderedDict({"some_boolean": (0, "boolean")})
-    with patch.object(msignals, "prompt", return_value="n"):
+    with patch.object(Moulinette.interface, "prompt", return_value="n"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -936,7 +936,7 @@ def test_parse_args_in_yunohost_format_boolean_input_no_ask():
     answers = {}
     expected_result = OrderedDict({"some_boolean": (1, "boolean")})
 
-    with patch.object(msignals, "prompt", return_value="y"):
+    with patch.object(Moulinette.interface, "prompt", return_value="y"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -965,7 +965,7 @@ def test_parse_args_in_yunohost_format_boolean_optional_with_input():
     answers = {}
     expected_result = OrderedDict({"some_boolean": (1, "boolean")})
 
-    with patch.object(msignals, "prompt", return_value="y"):
+    with patch.object(Moulinette.interface, "prompt", return_value="y"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -981,7 +981,7 @@ def test_parse_args_in_yunohost_format_boolean_optional_with_empty_input():
     answers = {}
     expected_result = OrderedDict({"some_boolean": (0, "boolean")})  # default to false
 
-    with patch.object(msignals, "prompt", return_value=""):
+    with patch.object(Moulinette.interface, "prompt", return_value=""):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -996,7 +996,7 @@ def test_parse_args_in_yunohost_format_boolean_optional_with_input_without_ask()
     answers = {}
     expected_result = OrderedDict({"some_boolean": (0, "boolean")})
 
-    with patch.object(msignals, "prompt", return_value="n"):
+    with patch.object(Moulinette.interface, "prompt", return_value="n"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -1039,7 +1039,7 @@ def test_parse_args_in_yunohost_format_boolean_input_test_ask():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value=0) as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value=0) as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with(ask_text + " [yes | no] (default: no)", False)
 
@@ -1057,7 +1057,7 @@ def test_parse_args_in_yunohost_format_boolean_input_test_ask_with_default():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value=1) as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value=1) as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with("%s [yes | no] (default: yes)" % ask_text, False)
 
@@ -1193,11 +1193,11 @@ def test_parse_args_in_yunohost_format_domain_two_domains_default_input():
         domain, "_get_maindomain", return_value=main_domain
     ), patch.object(domain, "domain_list", return_value={"domains": domains}):
         expected_result = OrderedDict({"some_domain": (main_domain, "domain")})
-        with patch.object(msignals, "prompt", return_value=main_domain):
+        with patch.object(Moulinette.interface, "prompt", return_value=main_domain):
             assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
         expected_result = OrderedDict({"some_domain": (other_domain, "domain")})
-        with patch.object(msignals, "prompt", return_value=other_domain):
+        with patch.object(Moulinette.interface, "prompt", return_value=other_domain):
             assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -1380,14 +1380,14 @@ def test_parse_args_in_yunohost_format_user_two_users_default_input():
     with patch.object(user, "user_list", return_value={"users": users}):
         with patch.object(user, "user_info", return_value={}):
             expected_result = OrderedDict({"some_user": (username, "user")})
-            with patch.object(msignals, "prompt", return_value=username):
+            with patch.object(Moulinette.interface, "prompt", return_value=username):
                 assert (
                     _parse_args_in_yunohost_format(answers, questions)
                     == expected_result
                 )
 
             expected_result = OrderedDict({"some_user": (other_user, "user")})
-            with patch.object(msignals, "prompt", return_value=other_user):
+            with patch.object(Moulinette.interface, "prompt", return_value=other_user):
                 assert (
                     _parse_args_in_yunohost_format(answers, questions)
                     == expected_result
@@ -1447,14 +1447,14 @@ def test_parse_args_in_yunohost_format_number_input():
     answers = {}
 
     expected_result = OrderedDict({"some_number": (1337, "number")})
-    with patch.object(msignals, "prompt", return_value="1337"):
+    with patch.object(Moulinette.interface, "prompt", return_value="1337"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
-    with patch.object(msignals, "prompt", return_value=1337):
+    with patch.object(Moulinette.interface, "prompt", return_value=1337):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
     expected_result = OrderedDict({"some_number": (0, "number")})
-    with patch.object(msignals, "prompt", return_value=""):
+    with patch.object(Moulinette.interface, "prompt", return_value=""):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -1468,7 +1468,7 @@ def test_parse_args_in_yunohost_format_number_input_no_ask():
     answers = {}
     expected_result = OrderedDict({"some_number": (1337, "number")})
 
-    with patch.object(msignals, "prompt", return_value="1337"):
+    with patch.object(Moulinette.interface, "prompt", return_value="1337"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -1497,7 +1497,7 @@ def test_parse_args_in_yunohost_format_number_optional_with_input():
     answers = {}
     expected_result = OrderedDict({"some_number": (1337, "number")})
 
-    with patch.object(msignals, "prompt", return_value="1337"):
+    with patch.object(Moulinette.interface, "prompt", return_value="1337"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -1512,7 +1512,7 @@ def test_parse_args_in_yunohost_format_number_optional_with_input_without_ask():
     answers = {}
     expected_result = OrderedDict({"some_number": (0, "number")})
 
-    with patch.object(msignals, "prompt", return_value="0"):
+    with patch.object(Moulinette.interface, "prompt", return_value="0"):
         assert _parse_args_in_yunohost_format(answers, questions) == expected_result
 
 
@@ -1555,7 +1555,7 @@ def test_parse_args_in_yunohost_format_number_input_test_ask():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="1111") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="1111") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with("%s (default: 0)" % (ask_text), False)
 
@@ -1573,7 +1573,7 @@ def test_parse_args_in_yunohost_format_number_input_test_ask_with_default():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="1111") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="1111") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         prompt.assert_called_with("%s (default: %s)" % (ask_text, default_value), False)
 
@@ -1592,7 +1592,7 @@ def test_parse_args_in_yunohost_format_number_input_test_ask_with_example():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="1111") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="1111") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
         assert example_value in prompt.call_args[0][0]
@@ -1612,7 +1612,7 @@ def test_parse_args_in_yunohost_format_number_input_test_ask_with_help():
     ]
     answers = {}
 
-    with patch.object(msignals, "prompt", return_value="1111") as prompt:
+    with patch.object(Moulinette.interface, "prompt", return_value="1111") as prompt:
         _parse_args_in_yunohost_format(answers, questions)
         assert ask_text in prompt.call_args[0][0]
         assert help_value in prompt.call_args[0][0]
diff --git a/src/yunohost/tests/test_ldapauth.py b/src/yunohost/tests/test_ldapauth.py
new file mode 100644
index 000000000..7560608f5
--- /dev/null
+++ b/src/yunohost/tests/test_ldapauth.py
@@ -0,0 +1,58 @@
+import pytest
+import os
+
+from yunohost.authenticators.ldap_admin import Authenticator as LDAPAuth
+from yunohost.tools import tools_adminpw
+
+from moulinette import m18n
+from moulinette.core import MoulinetteError
+
+def setup_function(function):
+
+    if os.system("systemctl is-active slapd") != 0:
+        os.system("systemctl start slapd && sleep 3")
+
+    tools_adminpw("yunohost", check_strength=False)
+
+
+def test_authenticate():
+    LDAPAuth().authenticate_credentials(credentials="yunohost")
+
+
+def test_authenticate_with_wrong_password():
+    with pytest.raises(MoulinetteError) as exception:
+        LDAPAuth().authenticate_credentials(credentials="bad_password_lul")
+
+    translation = m18n.g("invalid_password")
+    expected_msg = translation.format()
+    assert expected_msg in str(exception)
+
+
+def test_authenticate_server_down(mocker):
+    os.system("systemctl stop slapd && sleep 3")
+
+    # Now if slapd is down, moulinette tries to restart it
+    mocker.patch("os.system")
+    mocker.patch("time.sleep")
+    with pytest.raises(MoulinetteError) as exception:
+        LDAPAuth().authenticate_credentials(credentials="yunohost")
+
+    translation = m18n.n("ldap_server_down")
+    expected_msg = translation.format()
+    assert expected_msg in str(exception)
+
+
+def test_authenticate_change_password():
+
+    LDAPAuth().authenticate_credentials(credentials="yunohost")
+
+    tools_adminpw("plopette", check_strength=False)
+
+    with pytest.raises(MoulinetteError) as exception:
+        LDAPAuth().authenticate_credentials(credentials="yunohost")
+
+    translation = m18n.g("invalid_password")
+    expected_msg = translation.format()
+    assert expected_msg in str(exception)
+
+    LDAPAuth().authenticate_credentials(credentials="plopette")
diff --git a/src/yunohost/tools.py b/src/yunohost/tools.py
index 1cd197d70..4190e7614 100644
--- a/src/yunohost/tools.py
+++ b/src/yunohost/tools.py
@@ -30,7 +30,7 @@ import time
 from importlib import import_module
 from packaging import version
 
-from moulinette import msignals, m18n
+from moulinette import Moulinette, m18n
 from moulinette.utils.log import getActionLogger
 from moulinette.utils.process import check_output, call_async_output
 from moulinette.utils.filesystem import read_yaml, write_to_yaml
@@ -692,7 +692,7 @@ def tools_shutdown(operation_logger, force=False):
     if not shutdown:
         try:
             # Ask confirmation for server shutdown
-            i = msignals.prompt(m18n.n("server_shutdown_confirm", answers="y/N"))
+            i = Moulinette.prompt(m18n.n("server_shutdown_confirm", answers="y/N"))
         except NotImplemented:
             pass
         else:
@@ -711,7 +711,7 @@ def tools_reboot(operation_logger, force=False):
     if not reboot:
         try:
             # Ask confirmation for restoring
-            i = msignals.prompt(m18n.n("server_reboot_confirm", answers="y/N"))
+            i = Moulinette.prompt(m18n.n("server_reboot_confirm", answers="y/N"))
         except NotImplemented:
             pass
         else:
diff --git a/src/yunohost/user.py b/src/yunohost/user.py
index 266c2774c..01513f3bd 100644
--- a/src/yunohost/user.py
+++ b/src/yunohost/user.py
@@ -33,7 +33,7 @@ import string
 import subprocess
 import copy
 
-from moulinette import msignals, msettings, m18n
+from moulinette import Moulinette, m18n
 from moulinette.utils.log import getActionLogger
 from moulinette.utils.process import check_output
 
@@ -117,18 +117,18 @@ def user_create(
 
     # Validate domain used for email address/xmpp account
     if domain is None:
-        if msettings.get("interface") == "api":
+        if Moulinette.interface.type == "api":
             raise YunohostValidationError(
                 "Invalid usage, you should specify a domain argument"
             )
         else:
             # On affiche les differents domaines possibles
-            msignals.display(m18n.n("domains_available"))
+            Moulinette.display(m18n.n("domains_available"))
             for domain in domain_list()["domains"]:
-                msignals.display("- {}".format(domain))
+                Moulinette.display("- {}".format(domain))
 
             maindomain = _get_maindomain()
-            domain = msignals.prompt(
+            domain = Moulinette.prompt(
                 m18n.n("ask_user_domain") + " (default: %s)" % maindomain
             )
             if not domain:
@@ -379,8 +379,8 @@ def user_update(
         # when in the cli interface if the option to change the password is called
         # without a specified value, change_password will be set to the const 0.
         # In this case we prompt for the new password.
-        if msettings.get("interface") == "cli" and not change_password:
-            change_password = msignals.prompt(m18n.n("ask_password"), True, True)
+        if Moulinette.interface.type == "cli" and not change_password:
+            change_password = Moulinette.prompt(m18n.n("ask_password"), True, True)
         # Ensure sufficiently complex password
         assert_password_is_strong_enough("user", change_password)
 
diff --git a/src/yunohost/utils/ldap.py b/src/yunohost/utils/ldap.py
index 85bca34d7..1298eff69 100644
--- a/src/yunohost/utils/ldap.py
+++ b/src/yunohost/utils/ldap.py
@@ -1,5 +1,4 @@
 # -*- coding: utf-8 -*-
-
 """ License
 
     Copyright (C) 2019 YunoHost
@@ -21,10 +20,18 @@
 
 import os
 import atexit
-from moulinette.core import MoulinetteLdapIsDownError
-from moulinette.authenticators import ldap
+import logging
+import ldap
+import ldap.sasl
+import time
+import ldap.modlist as modlist
+
+from moulinette import m18n
+from moulinette.core import MoulinetteError
 from yunohost.utils.error import YunohostError
 
+logger = logging.getLogger("yunohost.utils.ldap")
+
 # We use a global variable to do some caching
 # to avoid re-authenticating in case we call _get_ldap_authenticator multiple times
 _ldap_interface = None
@@ -35,51 +42,21 @@ def _get_ldap_interface():
     global _ldap_interface
 
     if _ldap_interface is None:
-
-        conf = {
-            "vendor": "ldap",
-            "name": "as-root",
-            "parameters": {
-                "uri": "ldapi://%2Fvar%2Frun%2Fslapd%2Fldapi",
-                "base_dn": "dc=yunohost,dc=org",
-                "user_rdn": "gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth",
-            },
-            "extra": {},
-        }
-
-        try:
-            _ldap_interface = ldap.Authenticator(**conf)
-        except MoulinetteLdapIsDownError:
-            raise YunohostError(
-                "Service slapd is not running but is required to perform this action ... You can try to investigate what's happening with 'systemctl status slapd'"
-            )
-
-        assert_slapd_is_running()
+        _ldap_interface = LDAPInterface()
 
     return _ldap_interface
 
 
-def assert_slapd_is_running():
-
-    # Assert slapd is running...
-    if not os.system("pgrep slapd >/dev/null") == 0:
-        raise YunohostError(
-            "Service slapd is not running but is required to perform this action ... You can try to investigate what's happening with 'systemctl status slapd'"
-        )
-
-
 # We regularly want to extract stuff like 'bar' in ldap path like
 # foo=bar,dn=users.example.org,ou=example.org,dc=org so this small helper allow
 # to do this without relying of dozens of mysterious string.split()[0]
 #
 # e.g. using _ldap_path_extract(path, "foo") on the previous example will
 # return bar
-
-
 def _ldap_path_extract(path, info):
     for element in path.split(","):
         if element.startswith(info + "="):
-            return element[len(info + "=") :]
+            return element[len(info + "="):]
 
 
 # Add this to properly close / delete the ldap interface / authenticator
@@ -93,3 +70,247 @@ def _destroy_ldap_interface():
 
 
 atexit.register(_destroy_ldap_interface)
+
+
+class LDAPInterface():
+
+    def __init__(self):
+        logger.debug("initializing ldap interface")
+
+        self.uri = "ldapi://%2Fvar%2Frun%2Fslapd%2Fldapi"
+        self.basedn = "dc=yunohost,dc=org"
+        self.rootdn = "gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth"
+        self.connect()
+
+    def connect(self):
+        def _reconnect():
+            con = ldap.ldapobject.ReconnectLDAPObject(
+                self.uri, retry_max=10, retry_delay=0.5
+            )
+            con.sasl_non_interactive_bind_s("EXTERNAL")
+            return con
+
+        try:
+            con = _reconnect()
+        except ldap.SERVER_DOWN:
+            # ldap is down, attempt to restart it before really failing
+            logger.warning(m18n.n("ldap_server_is_down_restart_it"))
+            os.system("systemctl restart slapd")
+            time.sleep(10)  # waits 10 secondes so we are sure that slapd has restarted
+            try:
+                con = _reconnect()
+            except ldap.SERVER_DOWN:
+                raise YunohostError(
+                    "Service slapd is not running but is required to perform this action ... "
+                    "You can try to investigate what's happening with 'systemctl status slapd'"
+                )
+
+        # Check that we are indeed logged in with the right identity
+        try:
+            # whoami_s return dn:..., then delete these 3 characters
+            who = con.whoami_s()[3:]
+        except Exception as e:
+            logger.warning("Error during ldap authentication process: %s", e)
+            raise
+        else:
+            if who != self.rootdn:
+                raise MoulinetteError("Not logged in with the expected userdn ?!")
+            else:
+                self.con = con
+
+    def __del__(self):
+        """Disconnect and free ressources"""
+        if hasattr(self, "con") and self.con:
+            self.con.unbind_s()
+
+    def search(self, base=None, filter="(objectClass=*)", attrs=["dn"]):
+        """Search in LDAP base
+
+        Perform an LDAP search operation with given arguments and return
+        results as a list.
+
+        Keyword arguments:
+            - base -- The dn to search into
+            - filter -- A string representation of the filter to apply
+            - attrs -- A list of attributes to fetch
+
+        Returns:
+            A list of all results
+
+        """
+        if not base:
+            base = self.basedn
+
+        try:
+            result = self.con.search_s(base, ldap.SCOPE_SUBTREE, filter, attrs)
+        except Exception as e:
+            raise MoulinetteError(
+                "error during LDAP search operation with: base='%s', "
+                "filter='%s', attrs=%s and exception %s" % (base, filter, attrs, e),
+                raw_msg=True,
+            )
+
+        result_list = []
+        if not attrs or "dn" not in attrs:
+            result_list = [entry for dn, entry in result]
+        else:
+            for dn, entry in result:
+                entry["dn"] = [dn]
+                result_list.append(entry)
+
+        def decode(value):
+            if isinstance(value, bytes):
+                value = value.decode("utf-8")
+            return value
+
+        # result_list is for example :
+        # [{'virtualdomain': [b'test.com']}, {'virtualdomain': [b'yolo.test']},
+        for stuff in result_list:
+            if isinstance(stuff, dict):
+                for key, values in stuff.items():
+                    stuff[key] = [decode(v) for v in values]
+
+        return result_list
+
+    def add(self, rdn, attr_dict):
+        """
+        Add LDAP entry
+
+        Keyword arguments:
+            rdn         -- DN without domain
+            attr_dict   -- Dictionnary of attributes/values to add
+
+        Returns:
+            Boolean | MoulinetteError
+
+        """
+        dn = rdn + "," + self.basedn
+        ldif = modlist.addModlist(attr_dict)
+        for i, (k, v) in enumerate(ldif):
+            if isinstance(v, list):
+                v = [a.encode("utf-8") for a in v]
+            elif isinstance(v, str):
+                v = [v.encode("utf-8")]
+            ldif[i] = (k, v)
+
+        try:
+            self.con.add_s(dn, ldif)
+        except Exception as e:
+            raise MoulinetteError(
+                "error during LDAP add operation with: rdn='%s', "
+                "attr_dict=%s and exception %s" % (rdn, attr_dict, e),
+                raw_msg=True,
+            )
+        else:
+            return True
+
+    def remove(self, rdn):
+        """
+        Remove LDAP entry
+
+        Keyword arguments:
+            rdn         -- DN without domain
+
+        Returns:
+            Boolean | MoulinetteError
+
+        """
+        dn = rdn + "," + self.basedn
+        try:
+            self.con.delete_s(dn)
+        except Exception as e:
+            raise MoulinetteError(
+                "error during LDAP delete operation with: rdn='%s' and exception %s"
+                % (rdn, e),
+                raw_msg=True,
+            )
+        else:
+            return True
+
+    def update(self, rdn, attr_dict, new_rdn=False):
+        """
+        Modify LDAP entry
+
+        Keyword arguments:
+            rdn         -- DN without domain
+            attr_dict   -- Dictionnary of attributes/values to add
+            new_rdn     -- New RDN for modification
+
+        Returns:
+            Boolean | MoulinetteError
+
+        """
+        dn = rdn + "," + self.basedn
+        actual_entry = self.search(base=dn, attrs=None)
+        ldif = modlist.modifyModlist(actual_entry[0], attr_dict, ignore_oldexistent=1)
+
+        if ldif == []:
+            logger.debug("Nothing to update in LDAP")
+            return True
+
+        try:
+            if new_rdn:
+                self.con.rename_s(dn, new_rdn)
+                new_base = dn.split(",", 1)[1]
+                dn = new_rdn + "," + new_base
+
+            for i, (a, k, vs) in enumerate(ldif):
+                if isinstance(vs, list):
+                    vs = [v.encode("utf-8") for v in vs]
+                elif isinstance(vs, str):
+                    vs = [vs.encode("utf-8")]
+                ldif[i] = (a, k, vs)
+
+            self.con.modify_ext_s(dn, ldif)
+        except Exception as e:
+            raise MoulinetteError(
+                "error during LDAP update operation with: rdn='%s', "
+                "attr_dict=%s, new_rdn=%s and exception: %s"
+                % (rdn, attr_dict, new_rdn, e),
+                raw_msg=True,
+            )
+        else:
+            return True
+
+    def validate_uniqueness(self, value_dict):
+        """
+        Check uniqueness of values
+
+        Keyword arguments:
+            value_dict -- Dictionnary of attributes/values to check
+
+        Returns:
+            Boolean | MoulinetteError
+
+        """
+        attr_found = self.get_conflict(value_dict)
+        if attr_found:
+            logger.info(
+                "attribute '%s' with value '%s' is not unique",
+                attr_found[0],
+                attr_found[1],
+            )
+            raise MoulinetteError(
+                "ldap_attribute_already_exists",
+                attribute=attr_found[0],
+                value=attr_found[1],
+            )
+        return True
+
+    def get_conflict(self, value_dict, base_dn=None):
+        """
+        Check uniqueness of values
+
+        Keyword arguments:
+            value_dict -- Dictionnary of attributes/values to check
+
+        Returns:
+            None | tuple with Fist conflict attribute name and value
+
+        """
+        for attr, value in value_dict.items():
+            if not self.search(base=base_dn, filter=attr + "=" + value):
+                continue
+            else:
+                return (attr, value)
+        return None
diff --git a/tests/test_i18n_keys.py b/tests/test_i18n_keys.py
index 7b5ad1956..33c1f7b65 100644
--- a/tests/test_i18n_keys.py
+++ b/tests/test_i18n_keys.py
@@ -35,6 +35,7 @@ def find_expected_string_keys():
     python_files = glob.glob("src/yunohost/*.py")
     python_files.extend(glob.glob("src/yunohost/utils/*.py"))
     python_files.extend(glob.glob("src/yunohost/data_migrations/*.py"))
+    python_files.extend(glob.glob("src/yunohost/authenticators/*.py"))
     python_files.extend(glob.glob("data/hooks/diagnosis/*.py"))
     python_files.append("bin/yunohost")