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# -*- coding: utf-8 -*-
import ldap
LDAP_HOST = 'ldap://localhost:5678'
LDAP_BASE_DN = 'dc=account,dc=spline,dc=inf,dc=fu-berlin,dc=de'
LDAP_ADMIN_USER = 'admin'
LDAP_ADMIN_PASS = 'admin'
SERVICES = ['foren','jabber', 'gitlab']
class AccountService:
"""
To simplify account management through ldap this class can be used.
The AccountService class is stateless. It means that every request needs
its own authentication request (bind).
To test you stuff against our test setup use Port-Forwarding
ssh spline -L 5678:vm-splinux:389 -N
* register a new user
>> service = AccountService(LDAP_HOST, LDAP_BASE_DN, ADMIN_USER, ADMIN_PW, SERVICES)
>> foo = Account('foo','foo@bar.de', password='bar')
>> service.register(foo)
* authenticate a new user
>> service = AccountService(LDAP_HOST, LDAP_BASE_DN, ADMIN_USER, ADMIN_PW,, SERVICES)
>> foo = service.auth('foo', 'bar')
* updates an account
>> foo.change_mail('a@b.de')
>> foo.change_password('bar2') # changes root password
>> foo.change_password('bar2', 'gitlab') # changes password for gitlab
>> service.update(foo) # save changes in ldap backend
# save changes in ldap backend as admin user
>> service.update(foo, as_admin=True)
* delete an account
>> service = AccountService(LDAP_HOST, LDAP_BASE_DN, LDAP_ADMIN_USER, LDAP_ADMIN_PASS, SERVICES)
>> service.delete(Account)
>> service.delete('foo')
* find accounts
>> service = AccountService(LDAP_HOST, LDAP_BASE_DN, LDAP_ADMIN_USER, LDAP_ADMIN_PASS, SERVICES)
>> all_accounts = service.find()
>> print([x.uid for x in all_accounts])
"""
def __init__(self, ldap_host, base_dn, admin_user, admin_pass, services):
self.ldap_host = ldap_host
self.base_dn = base_dn
self.admin_user = admin_user
self.admin_pass = admin_pass
self.services = services
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.
"""
dn = 'uid=%s,ou=users,%s' % (username, self.base_dn)
self._bind(dn, password)
dn_user, data_user = self.connection.search_s(dn, ldap.SCOPE_SUBTREE)[0]
uid = data_user['uid'][0]
mail = data_user['mail'][0]
dn = 'ou=services,%s' % self.base_dn
filterstr = '(uid=%s)' % 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, filterstr = '(objectClass=*)'):
"""
Find accounts with raw ldap filter syntax
"""
self._bind_as_admin()
dn = 'ou=users,%s' % self.base_dn
data = self.connection.search_s(dn,ldap.SCOPE_SUBTREE,filterstr)
accounts = []
for a in data[1:]:
accounts.append(Account(a[1]['uid'],a[1]['mail']))
self._unbind()
return accounts
def register(self, account):
"""
Persists an account in the ldap backend
"""
self._bind_as_admin()
dn = 'uid=%s,ou=users,%s' % (account.uid, self.base_dn)
attr = [
('objectClass', ['top','inetOrgPerson']), ('uid',account.uid),
('sn', ' '), ('cn', ' '), ('mail', account.mail),
('userPassword', account.password)
]
self.connection.add_s(dn, attr)
account.dn = dn
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:
user = 'uid=%s,ou=users' % account.uid
password = account.password
self._bind('%s,%s' % (user, self.base_dn), password)
attr = [(ldap.MOD_REPLACE, 'mail', account.mail)]
dn = 'uid=%s,ou=users,%s' % (account.uid, self.base_dn)
self.connection.modify_s(dn, attr)
self._alter_passwords(account)
self._unbind()
def delete(self, account, admin_user = None, admin_pass = None):
"""
Deletes an account permanently.
"""
if as_admin:
self._bind_as_admin()
else:
if isinstance(account, basestring):
user = 'uid=%s,ou=users,%s' % (account, self.base_dn)
else:
user = account.dn
password = account.password
self._bind('%s,%s' % (user, self.base_dn), password)
dn = ['uid=%s,cn=%s,ou=services,%s' % (account.uid,s,self.base_dn) for s in account.services]
dn.append(user)
for x in dn:
self.connection.delete_s(x)
self._unbind()
def _bind(self, dn, password):
self.connection = ldap.initialize(self.ldap_host)
self.connection.version = ldap.VERSION3
self.connection.simple_bind_s(dn, password)
def _bind_as_admin():
self._bind('cn=%s,%s' % (self.admin_user, self.base_dn), self.admin_pass)
def _unbind(self):
self.connection.unbind_s()
def _alter_passwords(self, account):
if account.new_password_root:
attr = [
(ldap.MOD_REPLACE,'userPassword',account.new_password_root)
]
dn = 'uid=%s,ou=users,%s' % (account.uid, self.base_dn)
self.connection.modify_s(dn, attr)
account.new_password_root = None
for service, password in account.new_password_services.items():
attr = [
(ldap.MOD_REPLACE, 'userPassword', password)
]
dn = 'uid=%s,cn=%s,ou=services,%s' % (account.uid, service, self.base_dn)
self.connection.modify_s(dn, attr)
account.new_password_services = {}
class Account:
"""
An Account represents a complex ldap tree entry for spline users.
For each service a spline user can have a different password.
"""
def __init__(self, uid, mail, services = [], dn = None, password = None):
self.uid = uid
self.mail = mail
self.services = services
self.dn = dn
self.password = password
self.new_password_root = None
self.new_password_services = {}
def __repr__(self):
return "<Account uid=%s>" % self.uid
def change_password(self, new_password, service=None):
"""
Changes a password for a given service. You have to use the
AccountService class to make the changes permanent. If no service is
given, the root password will be changed.
"""
if isinstance(new_password, unicode):
new_password = new_password.encode('utf8')
if not service:
self.new_password_root = new_password
else:
self.new_password_services[service] = new_password
def change_email(self, new_mail):
"""
Changes the mail address of an account. You have to use the
AccountService class to make changes permanent.
"""
if isinstance(new_mail, unicode):
new_mail = new_mail.encode('utf8')
self.mail = new_mail
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