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# -*- coding: utf-8 -*-
import ldap3
from ldap3.utils.conv import escape_filter_chars
from ldap3.utils.dn import escape_rdn
from ldap3.core.exceptions import LDAPInvalidCredentialsResult, LDAPException
from . import Backend, InvalidPasswordError, NoSuchUserError, ShouldNotHappen
from accounts.models import Account
def _escape(value, wildcard=False):
if not isinstance(value, str):
value = str(value)
if not wildcard:
value = escape_filter_chars(value)
return escape_rdn(value)
def _change_password(conn, dn, passwords, as_admin=False):
old_password, new_password = passwords
if as_admin:
conn.extend.standard.modify_password(dn, None, new_password)
else:
try:
conn.extend.standard.modify_password(dn, old_password,
new_password)
except LDAPException:
raise InvalidPasswordError('Invalid password')
class LdapBackend(Backend):
def __init__(self, app):
super(LdapBackend, self).__init__(app)
self.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.
"""
user_dn = self._format_dn([('uid', username), ('ou', 'users')])
conn = self._connect(user_dn, password)
uid = None
mail = None
uidNumber = None
services = []
conn.search(user_dn, '(objectClass=*)',
attributes=['objectClass', 'uid', 'mail', 'cn', 'uidNumber'])
for entry in conn.entries:
if 'splineAccount' in entry.objectClass.values:
uid = entry.uid.value
mail = entry.mail.value
uidNumber = entry.uidNumber.value
elif 'servicePassword' in entry.objectClass.value:
services.append(entry.cn.value)
if uid is None or mail is None or uidNumber is None:
raise NoSuchUserError("User not found")
return Account(uid, mail, services, password,
uidNumber=uidNumber)
def find(self, filters=None, wildcard=False):
"""
Find accounts by a given filter.
"""
if filters is None:
filters = dict()
filters['objectClass'] = 'splineAccount'
filter_as_list = ['(%s=%s)' % (attr, _escape(value, wildcard))
for attr, value in list(filters.items())]
filterstr = '(&%s)' % ''.join(filter_as_list)
conn = self._connect()
base_dn = self._format_dn([('ou', 'users')])
accounts = []
try:
conn.search(base_dn, filterstr, search_scope=ldap3.LEVEL,
attributes=['uid', 'mail', 'uidNumber'])
for entry in conn.entries:
accounts.append(Account(entry.uid.value, entry.mail.value,
uidNumber=entry.uidNumber.value))
except LDAPException:
pass
return accounts
def _store(self, account):
conn = self._connect_as_admin()
user_dn = self._format_dn([('uid', account.uid), ('ou', 'users')])
attrs = {
'objectClass': ['top', 'inetOrgPerson', 'splineAccount'],
'uid': _escape(account.uid),
'sn': 'n/a',
'cn': _escape(account.uid),
'mail': _escape(account.mail),
'uidNumber': _escape(account.uidNumber),
}
conn.add(user_dn, attributes=attrs)
account.new_password_root = (None, account.password)
self._alter_passwords(conn, account)
def update(self, account, as_admin=False):
"""
Updates account informations like passwords or email.
"""
conn = None
user_dn = self._format_dn([('uid', account.uid), ('ou', 'users')])
if as_admin:
conn = self._connect_as_admin()
else:
conn = self._connect(user_dn, account.password)
attrs = {key: [(ldap3.MODIFY_REPLACE, [value])]
for key, value in list(account.attributes.items())}
conn.modify(user_dn, attrs)
self._alter_passwords(conn, account, as_admin=as_admin)
def delete(self, account, as_admin=False):
"""
Deletes an account permanently.
"""
conn = None
if as_admin:
conn = self._connect_as_admin()
else:
conn = self._connect(account.uid, account.password)
dns = [[('cn', service.id), ('uid', account.uid), ('ou', 'users')]
for service in account.services] + \
[[('uid', account.uid), ('ou', 'users')]]
for dn in dns:
conn.delete(self._format_dn(dn))
def _format_dn(self, attr, with_base_dn=True):
if with_base_dn:
attr.extend(self.base_dn)
dn = ['%s=%s' % (item[0], _escape(item[1]))
for item in attr]
return ','.join(dn)
def _connect(self, user=None, password=None):
server = ldap3.Server(self.host)
conn = ldap3.Connection(server, user, password, raise_exceptions=True)
try:
conn.bind()
except LDAPInvalidCredentialsResult:
raise InvalidPasswordError('Invalid password')
return conn
def _connect_as_admin(self):
admin_dn = self._format_dn([('cn', self.admin_user)])
return self._connect(admin_dn, self.admin_pass)
def _alter_passwords(self, conn, account, as_admin=False):
if account.new_password_root:
user_dn = self._format_dn([('uid', account.uid), ('ou', 'users')])
_change_password(conn, user_dn, account.new_password_root, as_admin)
_, account.password = account.new_password_root
account.new_password_root = None
for service, passwords in list(account.new_password_services.items()):
service_id = service.lower()
service_dn = self._format_dn([('cn', service_id), ('uid', account.uid),
('ou', 'users')])
_, new = passwords
if new != None:
if service_id not in account.services:
attrs = {
'objectClass': ['top', 'servicePassword'],
'cn': _escape(service_id),
}
conn.add(service_dn, attributes=attrs)
account.services.append(service_id)
_change_password(conn, service_dn, passwords, as_admin)
else:
if service_id in account.services:
conn.delete(service_dn)
account.services.remove(service_id)
del account.new_password_services[service]
def _get_last_uidNumber(self, conn):
uidNumber_dn = self._format_dn([('cn', 'uidMax'), ('ou', 'other')])
conn.search(uidNumber_dn, '(objectClass=uidNumberMaximum)',
attributes=['uidNumber'])
for entry in conn.entries:
return int(entry.uidNumber.value)
raise ShouldNotHappen('Last uidNumber not found.')
def _get_next_uidNumber(self):
conn = self._connect_as_admin()
uidNumber_dn = self._format_dn([('cn', 'uidMax'), ('ou', 'other')])
uidNumber = self._get_last_uidNumber(conn)
# Try to acquire next uidNumber
for i in [0, 1, 2, 3, 4, 5]:
try:
conn.modify(uidNumber_dn, {'uidNumber': [
(ldap3.MODIFY_DELETE, ['%d' % (uidNumber + i)]),
(ldap3.MODIFY_ADD, ['%d' % (uidNumber + i + 1)]),
]})
if conn.result['result'] == ldap3.RESULT_SUCCESS:
return uidNumber + i + 1
except ldap3.LDAPOperationResult:
pass
raise ShouldNotHappen('Unable to get next uidNumber, try again.')
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