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#!/usr/bin/env python
# encoding: utf-8
# ldap authentication lib
# Copyright (C) 2009-2011 Marcin Kuzminski <marcin@python-works.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2
# of the License or (at your opinion) any later version of the license.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA.
"""
Created on Nov 17, 2010
@author: marcink
"""
from rhodecode.lib.exceptions import *
import logging
log = logging.getLogger(__name__)
try:
import ldap
except ImportError:
pass
class AuthLdap(object):
def __init__(self, server, base_dn, port=389, bind_dn='', bind_pass='',
use_ldaps=False, tls_reqcert='DEMAND', ldap_version=3,
ldap_filter='(&(objectClass=user)(!(objectClass=computer)))',
search_scope='SUBTREE',
attr_login='uid'):
self.ldap_version = ldap_version
if use_ldaps:
port = port or 689
self.LDAP_USE_LDAPS = use_ldaps
self.TLS_REQCERT = ldap.__dict__['OPT_X_TLS_' + tls_reqcert]
self.LDAP_SERVER_ADDRESS = server
self.LDAP_SERVER_PORT = port
#USE FOR READ ONLY BIND TO LDAP SERVER
self.LDAP_BIND_DN = bind_dn
self.LDAP_BIND_PASS = bind_pass
ldap_server_type = 'ldap'
if self.LDAP_USE_LDAPS:ldap_server_type = ldap_server_type + 's'
self.LDAP_SERVER = "%s://%s:%s" % (ldap_server_type,
self.LDAP_SERVER_ADDRESS,
self.LDAP_SERVER_PORT)
self.BASE_DN = base_dn
self.LDAP_FILTER = ldap_filter
self.SEARCH_SCOPE = ldap.__dict__['SCOPE_' + search_scope]
self.attr_login = attr_login
def authenticate_ldap(self, username, password):
"""Authenticate a user via LDAP and return his/her LDAP properties.
Raises AuthenticationError if the credentials are rejected, or
EnvironmentError if the LDAP server can't be reached.
:param username: username
:param password: password
"""
from rhodecode.lib.helpers import chop_at
uid = chop_at(username, "@%s" % self.LDAP_SERVER_ADDRESS)
if "," in username:
raise LdapUsernameError("invalid character in username: ,")
try:
ldap.set_option(ldap.OPT_X_TLS_CACERTDIR, '/etc/openldap/cacerts')
ldap.set_option(ldap.OPT_REFERRALS, ldap.OPT_OFF)
ldap.set_option(ldap.OPT_RESTART, ldap.OPT_ON)
ldap.set_option(ldap.OPT_TIMEOUT, 20)
ldap.set_option(ldap.OPT_NETWORK_TIMEOUT, 10)
ldap.set_option(ldap.OPT_TIMELIMIT, 15)
if self.LDAP_USE_LDAPS:
ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, self.TLS_REQCERT)
server = ldap.initialize(self.LDAP_SERVER)
if self.ldap_version == 2:
server.protocol = ldap.VERSION2
else:
server.protocol = ldap.VERSION3
if self.LDAP_BIND_DN and self.LDAP_BIND_PASS:
server.simple_bind_s(self.LDAP_BIND_DN, self.LDAP_BIND_PASS)
filt = '(&%s(%s=%s))' % (self.LDAP_FILTER, self.attr_login, username)
log.debug("Authenticating %r filt %s at %s", self.BASE_DN,
filt, self.LDAP_SERVER)
lobjects = server.search_ext_s(self.BASE_DN, self.SEARCH_SCOPE,
filt)
if not lobjects:
raise ldap.NO_SUCH_OBJECT()
for (dn, attrs) in lobjects:
try:
server.simple_bind_s(dn, password)
break
except ldap.INVALID_CREDENTIALS, e:
log.debug("LDAP rejected password for user '%s' (%s): %s",
uid, username, dn)
else:
log.debug("No matching LDAP objects for authentication "
"of '%s' (%s)", uid, username)
raise LdapPasswordError()
except ldap.NO_SUCH_OBJECT, e:
log.debug("LDAP says no such user '%s' (%s)", uid, username)
raise LdapUsernameError()
except ldap.SERVER_DOWN, e:
raise LdapConnectionError("LDAP can't access authentication server")
return (dn, attrs)
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