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# -*- coding: utf-8 -*-
import ldap
from utils import Service
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 = [
Service('foren', 'Foren', 'http://foren.spline.de/'),
Service('jabber', 'Jabber', 'http://jabber.spline.de/'),
Service('gitlab', 'Gitlab', 'https://gitlab.spline.inf.fu-berlin.de/'),
Service('osqa', 'OS Q&A', 'http://osqa.spline.de/'),
]
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-account: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('newpw','oldpw') # changes root password
>> foo.change_password('newpw','oldpw', 'gitlab') # changes password for gitlab
>> service.update(foo) # save changes in ldap backend
# save changes in ldap backend as admin user (no need for old password)
>> 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() # find all accounts
>> print([x.uid for x in all_accounts])
>> service.find_by_uid('test') # find users by uid
>> service.get_by_uid('test') # same, raise NoSuchUserError if no match
>> service.find_by_mail('test@test.de') # find users by mail
>> service.find_by_uid('test*', wildcard=True) # find with wildcards
"""
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
self.admin = 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.
"""
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 get_by_uid(self, uid):
"""
Find a single user by uid. Unlike find_by_uid, don't return a list but
raise ValueError if there is no such user.
"""
users = self.find_by_uid(uid)
if len(users) != 1:
raise NoSuchUserError('No such user')
return users[0]
def find_by_uid(self, uid, wildcard=False):
return self.find({'uid':uid}, wildcard)
def find_by_mail(self, mail, wildcard=False):
return self.find({'mail':mail}, wildcard)
def find(self, filters = {}, wildcard=False):
"""
Find accounts by a given filter with key:value semantic)
"""
self._bind_anonymous()
dn = 'ou=users,%s' % self.base_dn
filters['objectClass'] = 'inetOrgPerson'
chars_to_escape = ['\\','(',')','\0']
if not wildcard:
chars_to_escape.append('*')
escape = lambda x,y: x.replace(y,'\%s' % y)
filter_as_list = ['(%s=%s)' % (k,reduce(escape, chars_to_escape, v)) for k,v in filters.items()]
filterstr = ''.join(filter_as_list)
if len(filter_as_list) > 1:
filterstr = '(&%s)' % filterstr
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 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)
]
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:
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, password=None, as_admin=False):
"""
Deletes an account permanently.
"""
if isinstance(account, basestring):
raise NotImplementedError()
else:
user = account.dn
password = account.password
if as_admin:
self._bind_as_admin()
else:
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.id 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):
self.admin = True
self._bind('cn=%s,%s' % (self.admin_user, self.base_dn), self.admin_pass)
def _bind_anonymous(self):
self._bind('','')
def _unbind(self):
self.connection.unbind_s()
self.admin = False
def _alter_passwords(self, account):
if account.new_password_root:
dn = 'uid=%s,ou=users,%s' % (account.uid, self.base_dn)
old, new = account.new_password_root
if self.admin:
self.connection.passwd_s(dn, None, new)
else:
self.connection.passwd_s(dn, old, new)
account.password = new
account.new_password_root = None
for service, passwords in account.new_password_services.items():
dn = 'uid=%s,cn=%s,ou=services,%s' % (account.uid, service, self.base_dn)
old, new = passwords
if self.admin:
self.connection.passwd_s(dn, None, new)
else:
self.connection.passwd_s(dn, old, new)
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.encode('utf8') if isinstance(uid, unicode) else uid
self.mail = mail.encode('utf8') if isinstance(mail, unicode) else mail
self.services = services
self.dn = dn
self.password = password.encode('utf8') if isinstance(password, unicode) else 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, old_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 isinstance(old_password, unicode):
old_password = old_password.encode('utf8')
if not service:
self.new_password_root = (old_password, new_password)
else:
self.new_password_services[service] = (old_password, 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
class NoSuchUserError(ValueError):
pass
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