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# -*- coding: utf-8 -*-
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"""
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rhodecode.controllers.changelog
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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RhodeCode authentication library for LDAP
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:created_on: Created on Nov 17, 2010
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:author: marcink
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:copyright: (C) 2010-2012 Marcin Kuzminski <marcin@python-works.com>
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:license: GPLv3, see COPYING for more details.
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"""
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import logging
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from rhodecode.lib.exceptions import LdapConnectionError, LdapUsernameError, \
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LdapPasswordError, LdapImportError
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from rhodecode.lib.utils2 import safe_str
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log = logging.getLogger(__name__)
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try:
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import ldap
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except ImportError:
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# means that python-ldap is not installed
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ldap = None
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class AuthLdap(object):
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def __init__(self, server, base_dn, port=389, bind_dn='', bind_pass='',
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tls_kind='PLAIN', tls_reqcert='DEMAND', ldap_version=3,
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ldap_filter='(&(objectClass=user)(!(objectClass=computer)))',
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search_scope='SUBTREE', attr_login='uid'):
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if ldap is None:
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raise LdapImportError
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self.ldap_version = ldap_version
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ldap_server_type = 'ldap'
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self.TLS_KIND = tls_kind
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if self.TLS_KIND == 'LDAPS':
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port = port or 689
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ldap_server_type = ldap_server_type + 's'
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OPT_X_TLS_DEMAND = 2
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self.TLS_REQCERT = getattr(ldap, 'OPT_X_TLS_%s' % tls_reqcert,
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OPT_X_TLS_DEMAND)
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# split server into list
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self.LDAP_SERVER_ADDRESS = server.split(',')
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self.LDAP_SERVER_PORT = port
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# USE FOR READ ONLY BIND TO LDAP SERVER
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self.LDAP_BIND_DN = safe_str(bind_dn)
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self.LDAP_BIND_PASS = safe_str(bind_pass)
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_LDAP_SERVERS = []
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for host in self.LDAP_SERVER_ADDRESS:
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_LDAP_SERVERS.append("%s://%s:%s" % (ldap_server_type,
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host.replace(' ', ''),
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self.LDAP_SERVER_PORT))
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self.LDAP_SERVER = str(', '.join(s for s in _LDAP_SERVERS))
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self.BASE_DN = safe_str(base_dn)
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self.LDAP_FILTER = safe_str(ldap_filter)
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self.SEARCH_SCOPE = getattr(ldap, 'SCOPE_%s' % search_scope)
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self.attr_login = attr_login
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def authenticate_ldap(self, username, password):
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"""
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Authenticate a user via LDAP and return his/her LDAP properties.
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Raises AuthenticationError if the credentials are rejected, or
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EnvironmentError if the LDAP server can't be reached.
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:param username: username
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:param password: password
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"""
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from rhodecode.lib.helpers import chop_at
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uid = chop_at(username, "@%s" % self.LDAP_SERVER_ADDRESS)
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if not password:
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log.debug("Attempt to authenticate LDAP user "
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"with blank password rejected.")
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raise LdapPasswordError()
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if "," in username:
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raise LdapUsernameError("invalid character in username: ,")
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try:
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if hasattr(ldap, 'OPT_X_TLS_CACERTDIR'):
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ldap.set_option(ldap.OPT_X_TLS_CACERTDIR,
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'/etc/openldap/cacerts')
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ldap.set_option(ldap.OPT_REFERRALS, ldap.OPT_OFF)
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ldap.set_option(ldap.OPT_RESTART, ldap.OPT_ON)
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ldap.set_option(ldap.OPT_TIMEOUT, 20)
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ldap.set_option(ldap.OPT_NETWORK_TIMEOUT, 10)
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ldap.set_option(ldap.OPT_TIMELIMIT, 15)
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if self.TLS_KIND != 'PLAIN':
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ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, self.TLS_REQCERT)
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server = ldap.initialize(self.LDAP_SERVER)
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if self.ldap_version == 2:
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server.protocol = ldap.VERSION2
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else:
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server.protocol = ldap.VERSION3
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if self.TLS_KIND == 'START_TLS':
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server.start_tls_s()
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if self.LDAP_BIND_DN and self.LDAP_BIND_PASS:
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log.debug('Trying simple_bind with password and given DN: %s'
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% self.LDAP_BIND_DN)
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server.simple_bind_s(self.LDAP_BIND_DN, self.LDAP_BIND_PASS)
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filter_ = '(&%s(%s=%s))' % (self.LDAP_FILTER, self.attr_login,
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username)
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log.debug("Authenticating %r filter %s at %s", self.BASE_DN,
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filter_, self.LDAP_SERVER)
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lobjects = server.search_ext_s(self.BASE_DN, self.SEARCH_SCOPE,
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filter_)
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if not lobjects:
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raise ldap.NO_SUCH_OBJECT()
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for (dn, _attrs) in lobjects:
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if dn is None:
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continue
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try:
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log.debug('Trying simple bind with %s' % dn)
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server.simple_bind_s(dn, password)
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attrs = server.search_ext_s(dn, ldap.SCOPE_BASE,
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'(objectClass=*)')[0][1]
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break
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except ldap.INVALID_CREDENTIALS:
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log.debug(
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"LDAP rejected password for user '%s' (%s): %s" % (
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uid, username, dn
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)
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)
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else:
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log.debug("No matching LDAP objects for authentication "
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"of '%s' (%s)", uid, username)
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raise LdapPasswordError()
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except ldap.NO_SUCH_OBJECT:
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log.debug("LDAP says no such user '%s' (%s)" % (uid, username))
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raise LdapUsernameError()
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except ldap.SERVER_DOWN:
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raise LdapConnectionError("LDAP can't access "
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"authentication server")
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return (dn, attrs)
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