mirror of
https://github.com/jwinterm/modoboa.git
synced 2026-10-23 06:38:40 +02:00
130 lines
4.5 KiB
Python
130 lines
4.5 KiB
Python
# coding: utf-8
|
|
|
|
"""
|
|
A collection of LDAP based classes/functions.
|
|
|
|
For a first version, the LDAP support offered by Modoboa only supports
|
|
one global server definition : the one the django-auth-ldap uses.
|
|
|
|
Extra information about Active Directory
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Extracted from `this blog
|
|
<http://www.dirmgr.com/blog/2010/8/26/ldap-password-changes-in-active-directory.html>`_:
|
|
|
|
- Active Directory doesn't appear to support the password modify
|
|
extended operation, so you must change passwords using a normal LDAP
|
|
modify operation.
|
|
|
|
- Active Directory stores passwords in the unicodePwd attribute,
|
|
rather than userPassword.
|
|
|
|
- Active Directory will only accept password changes over secure
|
|
connections. I have only ever used SSL. It may be that you can also
|
|
use StartTLS, or perhaps SASL with confidentiality, but I'm not sure
|
|
about that.
|
|
|
|
- The new password must be enclosed in quotation marks, and it must
|
|
use a UTF-16 little-endian encoding.
|
|
|
|
- Active Directory may impose some strength requirements on the
|
|
password, although exactly what those requirements are may vary from
|
|
one instance to another.
|
|
|
|
"""
|
|
|
|
from __future__ import unicode_literals
|
|
|
|
import ldap
|
|
|
|
from django.conf import settings
|
|
from django.utils.translation import ugettext as _
|
|
from django.utils.encoding import force_bytes
|
|
|
|
from modoboa.core.password_hashers import get_password_hasher
|
|
from modoboa.lib.exceptions import InternalError
|
|
from modoboa.parameters import tools as param_tools
|
|
|
|
|
|
class LDAPAuthBackend(object):
|
|
"""LDAP authentication backend."""
|
|
|
|
def __init__(self):
|
|
param_tools.apply_to_django_settings()
|
|
self.global_params = dict(param_tools.get_global_parameters("core"))
|
|
self.server_uri = self._setting(
|
|
"AUTH_LDAP_SERVER_URI", "ldap://localhost"
|
|
)
|
|
self.pwd_attr = self._setting("LDAP_PASSWORD_ATTR", "userPassword")
|
|
self.ldap_ad = self._setting("LDAP_ACTIVE_DIRECTORY", False)
|
|
self.conn = None
|
|
self.user_filter = self._setting("LDAP_USER_FILTER", "")
|
|
|
|
def _setting(self, name, default):
|
|
try:
|
|
value = getattr(settings, name)
|
|
except AttributeError:
|
|
value = default
|
|
return value
|
|
|
|
def _get_conn(self, dn, password):
|
|
"""Get a connection from the server."""
|
|
conn = ldap.initialize(self.server_uri, bytes_mode=False)
|
|
conn.set_option(ldap.OPT_X_TLS_DEMAND, True)
|
|
conn.set_option(ldap.OPT_DEBUG_LEVEL, 255)
|
|
conn.simple_bind_s(dn, password)
|
|
return conn
|
|
|
|
def connect_to_server(self, user, password):
|
|
"""Connect to the server according to configuration."""
|
|
if self.conn is not None:
|
|
return
|
|
mode = self.global_params["ldap_auth_method"]
|
|
if mode == "searchbind":
|
|
bind_dn = self._setting("AUTH_LDAP_BIND_DN", "")
|
|
bind_pwd = self._setting("AUTH_LDAP_BIND_PASSWORD", "")
|
|
self.conn = self._get_conn(bind_dn, bind_pwd)
|
|
else:
|
|
tpl = self._setting("AUTH_LDAP_USER_DN_TEMPLATE", "")
|
|
self.user_dn = tpl % {"user": user}
|
|
self.conn = self._get_conn(self.user_dn, password)
|
|
|
|
def _find_user_dn(self, user):
|
|
"""Find the DN of the given user."""
|
|
sbase = self.global_params["ldap_search_base"]
|
|
sfilter = self.global_params["ldap_search_filter"]
|
|
sfilter = sfilter % {"user": user}
|
|
res = self.conn.search_s(sbase, ldap.SCOPE_SUBTREE, sfilter)
|
|
try:
|
|
dn = res[0][0]
|
|
except IndexError:
|
|
return None
|
|
return dn
|
|
|
|
def _crypt_password(self, clearpassword):
|
|
"""Overidding of the crypt_password function (LDAP compliant)
|
|
|
|
:param clearpassword: the clear password
|
|
:return: the encrypted password
|
|
"""
|
|
scheme = self.global_params["password_scheme"]
|
|
hasher = get_password_hasher(scheme.upper())("ldap")
|
|
return hasher.encrypt(clearpassword)
|
|
|
|
def update_user_password(self, user, password, newpassword):
|
|
"""Update user password."""
|
|
self.connect_to_server(user, password)
|
|
user_dn = self._find_user_dn(user)
|
|
if self.ldap_ad:
|
|
newpassword = (
|
|
('"%s"' % newpassword).encode('utf-16').lstrip('\377\376')
|
|
)
|
|
ldif = [(ldap.MOD_REPLACE,
|
|
self.pwd_attr,
|
|
force_bytes(self._crypt_password(newpassword)))]
|
|
try:
|
|
self.conn.modify_s(user_dn, ldif)
|
|
except ldap.LDAPError as e:
|
|
raise InternalError(
|
|
_("Failed to update password: {}").format(e))
|