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# -*- coding: utf-8 -*-
from __future__ import absolute_import
import ldap
from . import Backend
from accounts.models import Account
class LdapBackend(Backend):
def __init__(self, app):
super(LdapBackend, self).__init__(app)
self.ldap_host = self.app.config['LDAP_HOST']
self.base_dn = self.app.config['LDAP_BASE_DN']
self.admin_user = self.app.config['LDAP_ADMIN_USER']
self.admin_pass = self.app.config['LDAP_ADMIN_PASS']
self.services = self.app.all_services
self.admin = False
self.binded = False
def auth(self, username, password):
"""
Tries to authenticate a user with a given password. If the
authentication is successful an Account object will be returned.
"""
self._bind_anonymous()
dn = self._format_dn([('uid', username), ('ou','users')])
try:
dn_user, data_user = self.connection.search_s(dn, ldap.SCOPE_SUBTREE)[0]
except ldap.NO_SUCH_OBJECT:
raise self.NoSuchUserError('No such user')
self._bind_as_user(username, password)
uid = data_user['uid'][0]
mail = data_user['mail'][0]
dn = self._format_dn([('ou', 'services')])
filterstr = '(uid=%s)' % self._escape(uid)
data_service = self.connection.search_s(dn, ldap.SCOPE_SUBTREE, filterstr)
services = []
for entry in data_service:
cn = filter(lambda x: x.startswith('cn='), entry[0].split(','))[0]
services.append(cn.split('=')[-1])
acc = Account(uid, mail, services, dn_user, password)
self._unbind()
return acc
def find(self, filters={}, wildcard=False):
"""
Find accounts by a given filter.
"""
self._bind_anonymous()
filters['objectClass'] = 'inetOrgPerson'
filter_as_list = ['(%s=%s)' % (k,self._escape(v, wildcard)) for k,v in filters.items()]
filterstr = ''.join(filter_as_list)
if len(filter_as_list) > 1:
filterstr = '(&%s)' % filterstr
dn = self._format_dn([('ou','users')])
data = self.connection.search_s(dn, ldap.SCOPE_SUBTREE, filterstr)
accounts = []
for a in data:
accounts.append(Account(a[1]['uid'][0], a[1]['mail'][0]))
self._unbind()
return accounts
def register(self, account):
"""
Persists an account in the backend.
"""
self._bind_as_admin()
dn = self._format_dn([('uid', account.uid),('ou','users')])
uid = self._escape(account.uid)
attr = [
('objectClass', ['top','inetOrgPerson']),
('uid', uid), ('sn', 'n/a'), ('cn', uid),
('mail', account.attributes['mail'])
]
self.connection.add_s(dn, attr)
account.dn = dn
account.new_password_root = (None, account.password)
self._alter_passwords(account)
self._unbind()
def update(self, account, as_admin=False):
"""
Updates account informations like passwords or email.
"""
if as_admin:
self._bind_as_admin()
else:
self._bind_as_user(account.uid, account.password)
attr = [(ldap.MOD_REPLACE, k, v) for k, v in account.attributes.items()]
dn = self._format_dn([('uid',account.uid),('ou','users')])
self.connection.modify_s(dn, attr)
self._alter_passwords(account, as_admin=as_admin)
self._unbind()
def delete(self, account, as_admin=False):
"""
Deletes an account permanently.
"""
if isinstance(account, basestring):
raise NotImplementedError()
else:
user = account.uid
password = account.password
if as_admin:
self._bind_as_admin()
else:
self._bind_as_user(user, password)
dn = [self._format_dn([('uid',user),('cn',s),('ou','services')]) for s.id in account.services]
dn.append(self._format_dn([('uid', user), ('ou','users')]))
for x in dn:
self.connection.delete_s(x)
self._unbind()
def _format_dn(self, attr, with_base_dn = True):
if with_base_dn:
attr.extend(self.base_dn)
dn = ['%s=%s' % (item[0], self._escape(item[1])) for item in attr]
return ','.join(dn)
def _bind(self, dn, password):
self.connection = ldap.initialize(self.ldap_host)
self.connection.version = ldap.VERSION3
try:
self.connection.simple_bind_s(dn, password)
except ldap.INVALID_CREDENTIALS:
raise self.InvalidPasswordError("Invalid Password")
def _bind_as_admin(self):
if self.binded:
self._unbind()
dn = self._format_dn([('cn', self.admin_user)])
self._bind(dn, self.admin_pass)
self.admin = True
self.binded = True
def _bind_as_user(self, username, password):
if self.binded:
self._unbind()
dn = self._format_dn([('uid', username),('ou', 'users')])
self._bind(dn, password)
self.binded = True
self.admin = True
def _bind_anonymous(self):
if self.binded:
self._unbind()
self._bind('','')
self.binded = True
def _unbind(self):
self.connection.unbind_s()
self.admin = False
self.binded = False
def _alter_passwords(self, account, as_admin=False):
if account.new_password_root:
dn = self._format_dn([('uid',account.uid),('ou','users')])
old, new = account.new_password_root
if as_admin:
self.connection.passwd_s(dn, None, new)
else:
try:
self.connection.passwd_s(dn, old, new)
except ldap.UNWILLING_TO_PERFORM:
raise InvalidPasswordError()
account.password = new
account.new_password_root = None
for service, passwords in account.new_password_services.items():
dn = self._format_dn([('uid',account.uid),('cn',service),('ou','services')])
old, new = passwords
if new != None:
if service not in account.services:
attr = [('objectClass', ['top', 'servicePassword']), ('uid', account.uid)]
self.connection.add_s(dn, attr)
if as_admin:
self.connection.passwd_s(dn, None, new)
else:
self.connection.passwd_s(dn, old, new)
else:
s = service.lower()
if s in account.services:
self.connection.delete_s(dn)
account.services.remove(s)
account.new_password_services = {}
def _escape(self, s, wildcard=False):
chars_to_escape = ['\\',',','=','+','<','>',';','"','\'','#','(',')','\0']
if not wildcard:
chars_to_escape.append('*')
escape = lambda x,y: x.replace(y,'\%02X' % ord(y))
return reduce(escape, chars_to_escape, s)
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