forked from Github-Mirrors/canaille
386 lines
13 KiB
Python
386 lines
13 KiB
Python
import ldap.dn
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import ldap.filter
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from flask import g
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from .utils import ldap_to_python
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from .utils import python_to_ldap
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class LDAPObjectMetaclass(type):
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ldap_to_python_class = {}
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def __new__(cls, name, bases, attrs):
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klass = super().__new__(cls, name, bases, attrs)
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if attrs.get("object_class"):
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for oc in attrs["object_class"]:
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cls.ldap_to_python_class[oc] = klass
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return klass
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def __setattr__(cls, name, value):
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super().__setattr__(name, value)
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if name == "object_class":
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for oc in value:
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cls.ldap_to_python_class[oc] = cls
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class LDAPObject(metaclass=LDAPObjectMetaclass):
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_object_class_by_name = None
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_attribute_type_by_name = None
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_may = None
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_must = None
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base = None
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root_dn = None
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rdn_attribute = None
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attribute_table = None
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object_class = None
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def __init__(self, dn=None, **kwargs):
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self.attrs = {}
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self.changes = {}
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kwargs.setdefault("objectClass", self.object_class)
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for name, value in kwargs.items():
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setattr(self, name, value)
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def __repr__(self):
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return (
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f"<{self.__class__.__name__} {self.rdn_attribute}={self.rdn_value}>"
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if self.rdn_attribute
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else "<LDAPOBject>"
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)
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def __eq__(self, other):
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if not (
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isinstance(other, self.__class__)
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and self.may() == other.may()
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and self.must() == other.must()
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and all(
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hasattr(self, attr) == hasattr(other, attr)
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for attr in self.may() + self.must()
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)
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):
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return False
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self_attributes = self.python_attrs_to_ldap(
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{
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attr: getattr(self, attr)
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for attr in self.may() + self.must()
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if hasattr(self, attr)
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}
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)
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other_attributes = other.python_attrs_to_ldap(
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{
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attr: getattr(other, attr)
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for attr in self.may() + self.must()
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if hasattr(self, attr)
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}
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)
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return self_attributes == other_attributes
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def __hash__(self):
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return hash(self.dn)
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def __getattr__(self, name):
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if self.attribute_table:
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name = self.attribute_table.get(name, name)
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if name not in self.ldap_object_attributes():
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return super().__getattribute__(name)
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single_value = self.ldap_object_attributes()[name].single_value
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if name in self.changes:
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return self.changes[name][0] if single_value else self.changes[name]
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if not self.attrs.get(name):
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return None if single_value else []
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# Lazy conversion from ldap format to python format
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if any(isinstance(value, bytes) for value in self.attrs[name]):
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syntax = self.attribute_ldap_syntax(name)
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self.attrs[name] = [
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ldap_to_python(value, syntax) for value in self.attrs[name]
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]
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if single_value:
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return self.attrs.get(name)[0]
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else:
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return self.attrs.get(name)
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def __setattr__(self, name, value):
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if self.attribute_table:
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name = self.attribute_table.get(name, name)
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if name in self.ldap_object_attributes():
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value = [value] if not isinstance(value, list) else value
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self.changes[name] = value
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else:
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super().__setattr__(name, value)
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def __getitem__(self, item):
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return getattr(self, item)
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def __setitem__(self, item, value):
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return setattr(self, item, value)
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@property
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def rdn_value(self):
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value = getattr(self, self.rdn_attribute)
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return (value[0] if isinstance(value, list) else value).strip()
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@property
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def dn(self):
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return f"{self.rdn_attribute}={ldap.dn.escape_dn_chars(self.rdn_value)},{self.base},{self.root_dn}"
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def may(self):
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if not self._may:
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self.update_ldap_attributes()
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return self._may
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def must(self):
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return self._must
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@classmethod
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def ldap_connection(cls):
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return g.ldap_connection
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@classmethod
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def initialize(cls, conn=None):
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conn = conn or cls.ldap_connection()
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cls.ldap_object_classes(conn)
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cls.ldap_object_attributes(conn)
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acc = ""
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for organizationalUnit in cls.base.split(",")[::-1]:
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v = organizationalUnit.split("=")[1]
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dn = f"{organizationalUnit}{acc},{cls.root_dn}"
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acc = f",{organizationalUnit}"
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try:
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conn.add_s(
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dn,
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[
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("objectClass", [b"organizationalUnit"]),
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("ou", [v.encode("utf-8")]),
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],
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)
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except ldap.ALREADY_EXISTS:
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pass
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@classmethod
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def ldap_object_classes(cls, conn=None, force=False):
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if cls._object_class_by_name and not force:
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return cls._object_class_by_name
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conn = conn or cls.ldap_connection()
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res = conn.search_s(
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"cn=subschema", ldap.SCOPE_BASE, "(objectclass=*)", ["*", "+"]
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)
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subschema_entry = res[0]
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subschema_subentry = ldap.cidict.cidict(subschema_entry[1])
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subschema = ldap.schema.SubSchema(subschema_subentry)
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object_class_oids = subschema.listall(ldap.schema.models.ObjectClass)
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cls._object_class_by_name = {}
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for oid in object_class_oids:
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object_class = subschema.get_obj(ldap.schema.models.ObjectClass, oid)
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for name in object_class.names:
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cls._object_class_by_name[name] = object_class
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return cls._object_class_by_name
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@classmethod
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def ldap_object_attributes(cls, conn=None, force=False):
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if cls._attribute_type_by_name and not force:
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return cls._attribute_type_by_name
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conn = conn or cls.ldap_connection()
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res = conn.search_s(
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"cn=subschema", ldap.SCOPE_BASE, "(objectclass=*)", ["*", "+"]
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)
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subschema_entry = res[0]
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subschema_subentry = ldap.cidict.cidict(subschema_entry[1])
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subschema = ldap.schema.SubSchema(subschema_subentry)
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attribute_type_oids = subschema.listall(ldap.schema.models.AttributeType)
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cls._attribute_type_by_name = {}
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for oid in attribute_type_oids:
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object_class = subschema.get_obj(ldap.schema.models.AttributeType, oid)
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for name in object_class.names:
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cls._attribute_type_by_name[name] = object_class
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return cls._attribute_type_by_name
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@classmethod
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def python_attrs_to_ldap(cls, attrs, encode=True):
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if cls.attribute_table:
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attrs = {
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cls.attribute_table.get(name, name): values
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for name, values in attrs.items()
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}
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return {
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name: [
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python_to_ldap(value, cls.attribute_ldap_syntax(name), encode=encode)
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for value in (values if isinstance(values, list) else [values])
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]
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for name, values in attrs.items()
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}
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@classmethod
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def attribute_ldap_syntax(cls, attribute_name):
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ldap_attrs = LDAPObject.ldap_object_attributes()
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if attribute_name not in ldap_attrs:
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return None
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if ldap_attrs[attribute_name].syntax:
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return ldap_attrs[attribute_name].syntax
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return cls.attribute_ldap_syntax(ldap_attrs[attribute_name].sup[0])
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@classmethod
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def get(cls, dn=None, filter=None, conn=None, **kwargs):
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try:
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return cls.query(dn, filter, conn, **kwargs)[0]
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except (IndexError, ldap.NO_SUCH_OBJECT):
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return None
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@classmethod
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def query(cls, base=None, filter=None, conn=None, **kwargs):
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conn = conn or cls.ldap_connection()
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if base is None:
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base = f"{cls.base},{cls.root_dn}"
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elif "=" not in base:
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base = f"{cls.rdn_attribute}={base},{cls.base},{cls.root_dn}"
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class_filter = (
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"".join([f"(objectClass={oc})" for oc in cls.object_class])
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if getattr(cls, "object_class")
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else ""
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)
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arg_filter = ""
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escaped_args = cls.python_attrs_to_ldap(kwargs, encode=False)
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for key, value in escaped_args.items():
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if len(value) == 1:
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escaped_value = ldap.filter.escape_filter_chars(value[0])
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arg_filter += f"({key}={escaped_value})"
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else:
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values = [ldap.filter.escape_filter_chars(v) for v in value]
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arg_filter += (
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"(|" + "".join([f"({key}={value})" for value in values]) + ")"
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)
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if not filter:
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filter = ""
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elif not filter.startswith("(") and not filter.endswith(")"):
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filter = f"({filter})"
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ldapfilter = f"(&{class_filter}{arg_filter}{filter})"
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base = base or f"{cls.base},{cls.root_dn}"
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result = conn.search_s(base, ldap.SCOPE_SUBTREE, ldapfilter or None, ["+", "*"])
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objects = []
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for _, args in result:
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cls = cls.guess_class(args["objectClass"])
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obj = cls()
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obj.attrs = args
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objects.append(obj)
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return objects
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@classmethod
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def guess_class(cls, object_classes):
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if cls == LDAPObject:
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for oc in object_classes:
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if oc.decode() in LDAPObjectMetaclass.ldap_to_python_class:
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return LDAPObjectMetaclass.ldap_to_python_class[oc.decode()]
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return cls
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@classmethod
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def update_ldap_attributes(cls):
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all_object_classes = cls.ldap_object_classes()
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this_object_classes = {all_object_classes[name] for name in cls.object_class}
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done = set()
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cls._may = []
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cls._must = []
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while len(this_object_classes) > 0:
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object_class = this_object_classes.pop()
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done.add(object_class)
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this_object_classes |= {
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all_object_classes[ocsup]
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for ocsup in object_class.sup
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if ocsup not in done
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}
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cls._may.extend(object_class.may)
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cls._must.extend(object_class.must)
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cls._may = list(set(cls._may))
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cls._must = list(set(cls._must))
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def reload(self, conn=None):
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conn = conn or self.ldap_connection()
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result = conn.search_s(self.dn, ldap.SCOPE_SUBTREE, None, ["+", "*"])
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self.changes = {}
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self.attrs = result[0][1]
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def save(self, conn=None):
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conn = conn or self.ldap_connection()
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try:
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match = bool(conn.search_s(self.dn, ldap.SCOPE_SUBTREE))
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except ldap.NO_SUCH_OBJECT:
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match = False
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# Object already exists in the LDAP database
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if match:
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deletions = [
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name
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for name, value in self.changes.items()
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if (value is None or value == [None]) and name in self.attrs
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]
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changes = {
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name: value
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for name, value in self.changes.items()
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if name not in deletions and self.attrs.get(name) != value
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}
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formatted_changes = {
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name: value
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for name, value in self.python_attrs_to_ldap(changes).items()
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if value is not None and value != [None]
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}
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modlist = [(ldap.MOD_DELETE, name, None) for name in deletions] + [
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(ldap.MOD_REPLACE, name, values)
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for name, values in formatted_changes.items()
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]
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conn.modify_s(self.dn, modlist)
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# Object does not exist yet in the LDAP database
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else:
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changes = {
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name: value
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for name, value in {**self.attrs, **self.changes}.items()
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if value and value[0]
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}
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formatted_changes = {
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name: value
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for name, value in self.python_attrs_to_ldap(changes).items()
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if value is not None and value != None
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}
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attributes = [(name, values) for name, values in formatted_changes.items()]
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conn.add_s(self.dn, attributes)
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self.attrs = {**self.attrs, **self.changes}
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self.changes = {}
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def update(self, **kwargs):
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for k, v in kwargs.items():
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self.__setattr__(k, v)
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def delete(self, conn=None):
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conn = conn or self.ldap_connection()
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conn.delete_s(self.dn)
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def keys(self):
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ldap_keys = self.must() + self.may()
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inverted_table = {value: key for key, value in self.attribute_table.items()}
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return [inverted_table.get(key, key) for key in ldap_keys]
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