ldap(major): start rewrite
This commit is contained in:
Jens Langhammer
201
passbook/sources/ldap/connector.py
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201
passbook/sources/ldap/connector.py
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"""Wrapper for ldap3 to easily manage user"""
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from time import time
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import ldap3
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import ldap3.core.exceptions
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from structlog import get_logger
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from passbook.core.models import User
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from passbook.lib.config import CONFIG
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from passbook.sources.ldap.models import LDAPSource
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LOGGER = get_logger()
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# USERNAME_FIELD = CONFIG.y('ldap.username_field', 'sAMAccountName')
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# LOGIN_FIELD = CONFIG.y('ldap.login_field', 'userPrincipalName')
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class Connector:
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"""Wrapper for ldap3 to easily manage user authentication and creation"""
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_server: ldap3.Server
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_connection = ldap3.Connection
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_source: LDAPSource
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def __init__(self, source: LDAPSource):
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self._source = source
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if not self._source.enabled:
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LOGGER.debug("LDAP not Enabled")
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self._server = ldap3.Server(source.server_uri) # Implement URI parsing
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self._connection = ldap3.Connection(self._server, raise_exceptions=True,
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user=source.bind_cn,
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password=source.bind_password)
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self._connection.bind()
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if source.start_tls:
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self._connection.start_tls()
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@staticmethod
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def encode_pass(password: str) -> str:
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"""Encodes a plain-text password so it can be used by AD"""
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return '"{}"'.format(password).encode('utf-16-le')
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def generate_filter(self, **fields):
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"""Generate LDAP filter from **fields."""
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filters = []
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for item, value in fields.items():
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filters.append("(%s=%s)" % (item, value))
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ldap_filter = "(&%s)" % "".join(filters)
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LOGGER.debug("Constructed filter: '%s'", ldap_filter)
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return ldap_filter
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def lookup(self, ldap_filter: str):
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"""Search email in LDAP and return the DN.
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Returns False if nothing was found."""
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try:
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self._connection.search(self._source.search_base, ldap_filter)
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results = self._connection.response
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if len(results) >= 1:
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if 'dn' in results[0]:
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return str(results[0]['dn'])
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except ldap3.core.exceptions.LDAPNoSuchObjectResult as exc:
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LOGGER.warning(exc)
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return False
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except ldap3.core.exceptions.LDAPInvalidDnError as exc:
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LOGGER.warning(exc)
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return False
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return False
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def _get_or_create_user(self, user_data):
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"""Returns a Django user for the given LDAP user data.
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If the user does not exist, then it will be created."""
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attributes = user_data.get("attributes")
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if attributes is None:
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LOGGER.warning("LDAP user attributes empty")
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return None
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# Create the user data.
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field_map = {
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'username': '%(' + ')s',
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'name': '%(givenName)s %(sn)s',
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'email': '%(mail)s',
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}
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user_fields = {}
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for dj_field, ldap_field in field_map.items():
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user_fields[dj_field] = ldap_field % attributes
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# Update or create the user.
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user, created = User.objects.update_or_create(
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defaults=user_fields,
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username=user_fields.pop('username', "")
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)
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# Update groups
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# if 'memberOf' in attributes:
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# applicable_groups = LDAPGroupMapping.objects.f
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# ilter(ldap_dn__in=attributes['memberOf'])
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# for group in applicable_groups:
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# if group.group not in user.groups.all():
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# user.groups.add(group.group)
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# user.save()
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# If the user was created, set them an unusable password.
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if created:
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user.set_unusable_password()
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user.save()
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# All done!
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LOGGER.debug("LDAP user lookup succeeded")
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return user
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def auth_user(self, password, **filters):
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"""Try to bind as either user_dn or mail with password.
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Returns True on success, otherwise False"""
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filters.pop('request')
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if not self._source.enabled:
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return None
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# FIXME: Adapt user_uid
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# email = filters.pop(CONFIG.y('passport').get('ldap').get, '')
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email = filters.pop('email')
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user_dn = self.lookup(self.generate_filter(**{'email': email}))
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if not user_dn:
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return None
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# Try to bind as new user
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LOGGER.debug("Binding as '%s'", user_dn)
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try:
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temp_connection = ldap3.Connection(self._server, user=user_dn,
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password=password, raise_exceptions=True)
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temp_connection.bind()
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if self._connection.search(
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search_base=self._source.search_base,
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search_filter=self.generate_filter(**{'email': email}),
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search_scope=ldap3.SUBTREE,
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attributes=[ldap3.ALL_ATTRIBUTES, ldap3.ALL_OPERATIONAL_ATTRIBUTES],
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get_operational_attributes=True,
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size_limit=1,
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):
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response = self._connection.response[0]
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# If user has no email set in AD, use UPN
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if 'mail' not in response.get('attributes'):
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response['attributes']['mail'] = response['attributes']['userPrincipalName']
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return self._get_or_create_user(response)
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LOGGER.warning("LDAP user lookup failed")
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return None
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except ldap3.core.exceptions.LDAPInvalidCredentialsResult as exception:
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LOGGER.debug("User '%s' failed to login (Wrong credentials)", user_dn)
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except ldap3.core.exceptions.LDAPException as exception:
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LOGGER.warning(exception)
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return None
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def _do_modify(self, diff, **fields):
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"""Do the LDAP modification itself"""
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user_dn = self.lookup(self.generate_filter(**fields))
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try:
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self._connection.modify(user_dn, diff)
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except ldap3.core.exceptions.LDAPException as exception:
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LOGGER.warning("Failed to modify %s ('%s'), saved to DB", user_dn, exception)
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# Connector.handle_ldap_error(user_dn, LDAPModification.ACTION_MODIFY, diff)
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LOGGER.debug("modified account '%s' [%s]", user_dn, ','.join(diff.keys()))
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return 'result' in self._connection.result and self._connection.result['result'] == 0
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def disable_user(self, **fields):
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"""Disables LDAP user based on mail or user_dn.
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Returns True on success, otherwise False"""
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diff = {
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'userAccountControl': [(ldap3.MODIFY_REPLACE, [str(66050)])],
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}
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return self._do_modify(diff, **fields)
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def enable_user(self, **fields):
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"""Enables LDAP user based on mail or user_dn.
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Returns True on success, otherwise False"""
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diff = {
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'userAccountControl': [(ldap3.MODIFY_REPLACE, [str(66048)])],
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}
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return self._do_modify(diff, **fields)
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def change_password(self, new_password, **fields):
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"""Changes LDAP user's password based on mail or user_dn.
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Returns True on success, otherwise False"""
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diff = {
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'unicodePwd': [(ldap3.MODIFY_REPLACE, [Connector.encode_pass(new_password)])],
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}
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return self._do_modify(diff, **fields)
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def add_to_group(self, group_dn, **fields):
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"""Adds mail or user_dn to group_dn
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Returns True on success, otherwise False"""
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user_dn = self.lookup(**fields)
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diff = {
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'member': [(ldap3.MODIFY_ADD), [user_dn]]
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}
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return self._do_modify(diff, user_dn=group_dn)
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def remove_from_group(self, group_dn, **fields):
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"""Removes mail or user_dn from group_dn
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Returns True on success, otherwise False"""
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user_dn = self.lookup(**fields)
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diff = {
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'member': [(ldap3.MODIFY_DELETE), [user_dn]]
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}
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return self._do_modify(diff, user_dn=group_dn)
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