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auth_ldap.py
506 lines | 18.3 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
# Copyright (C) 2010-2018 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/
"""
RhodeCode authentication plugin for LDAP
"""
import logging
import traceback
import colander
from rhodecode.translation import _
from rhodecode.authentication.base import (
RhodeCodeExternalAuthPlugin, AuthLdapBase, hybrid_property)
from rhodecode.authentication.schema import AuthnPluginSettingsSchemaBase
from rhodecode.authentication.routes import AuthnPluginResourceBase
from rhodecode.lib.colander_utils import strip_whitespace
from rhodecode.lib.exceptions import (
LdapConnectionError, LdapUsernameError, LdapPasswordError, LdapImportError
)
from rhodecode.lib.utils2 import safe_unicode, safe_str
from rhodecode.model.db import User
from rhodecode.model.validators import Missing
log = logging.getLogger(__name__)
try:
import ldap
except ImportError:
# means that python-ldap is not installed, we use Missing object to mark
# ldap lib is Missing
ldap = Missing
class LdapError(Exception):
pass
def plugin_factory(plugin_id, *args, **kwds):
"""
Factory function that is called during plugin discovery.
It returns the plugin instance.
"""
plugin = RhodeCodeAuthPlugin(plugin_id)
return plugin
class LdapAuthnResource(AuthnPluginResourceBase):
pass
class LdapSettingsSchema(AuthnPluginSettingsSchemaBase):
tls_kind_choices = ['PLAIN', 'LDAPS', 'START_TLS']
tls_reqcert_choices = ['NEVER', 'ALLOW', 'TRY', 'DEMAND', 'HARD']
search_scope_choices = ['BASE', 'ONELEVEL', 'SUBTREE']
host = colander.SchemaNode(
colander.String(),
default='',
description=_('Host[s] of the LDAP Server \n'
'(e.g., 192.168.2.154, or ldap-server.domain.com.\n '
'Multiple servers can be specified using commas'),
preparer=strip_whitespace,
title=_('LDAP Host'),
widget='string')
port = colander.SchemaNode(
colander.Int(),
default=389,
description=_('Custom port that the LDAP server is listening on. '
'Default value is: 389'),
preparer=strip_whitespace,
title=_('Port'),
validator=colander.Range(min=0, max=65536),
widget='int')
timeout = colander.SchemaNode(
colander.Int(),
default=60 * 5,
description=_('Timeout for LDAP connection'),
preparer=strip_whitespace,
title=_('Connection timeout'),
validator=colander.Range(min=1),
widget='int')
dn_user = colander.SchemaNode(
colander.String(),
default='',
description=_('Optional user DN/account to connect to LDAP if authentication is required. \n'
'e.g., cn=admin,dc=mydomain,dc=com, or '
'uid=root,cn=users,dc=mydomain,dc=com, or admin@mydomain.com'),
missing='',
preparer=strip_whitespace,
title=_('Account'),
widget='string')
dn_pass = colander.SchemaNode(
colander.String(),
default='',
description=_('Password to authenticate for given user DN.'),
missing='',
preparer=strip_whitespace,
title=_('Password'),
widget='password')
tls_kind = colander.SchemaNode(
colander.String(),
default=tls_kind_choices[0],
description=_('TLS Type'),
title=_('Connection Security'),
validator=colander.OneOf(tls_kind_choices),
widget='select')
tls_reqcert = colander.SchemaNode(
colander.String(),
default=tls_reqcert_choices[0],
description=_('Require Cert over TLS?. Self-signed and custom '
'certificates can be used when\n `RhodeCode Certificate` '
'found in admin > settings > system info page is extended.'),
title=_('Certificate Checks'),
validator=colander.OneOf(tls_reqcert_choices),
widget='select')
base_dn = colander.SchemaNode(
colander.String(),
default='',
description=_('Base DN to search. Dynamic bind is supported. Add `$login` marker '
'in it to be replaced with current user credentials \n'
'(e.g., dc=mydomain,dc=com, or ou=Users,dc=mydomain,dc=com)'),
missing='',
preparer=strip_whitespace,
title=_('Base DN'),
widget='string')
filter = colander.SchemaNode(
colander.String(),
default='',
description=_('Filter to narrow results \n'
'(e.g., (&(objectCategory=Person)(objectClass=user)), or \n'
'(memberof=cn=rc-login,ou=groups,ou=company,dc=mydomain,dc=com)))'),
missing='',
preparer=strip_whitespace,
title=_('LDAP Search Filter'),
widget='string')
search_scope = colander.SchemaNode(
colander.String(),
default=search_scope_choices[2],
description=_('How deep to search LDAP. If unsure set to SUBTREE'),
title=_('LDAP Search Scope'),
validator=colander.OneOf(search_scope_choices),
widget='select')
attr_login = colander.SchemaNode(
colander.String(),
default='uid',
description=_('LDAP Attribute to map to user name (e.g., uid, or sAMAccountName)'),
preparer=strip_whitespace,
title=_('Login Attribute'),
missing_msg=_('The LDAP Login attribute of the CN must be specified'),
widget='string')
attr_firstname = colander.SchemaNode(
colander.String(),
default='',
description=_('LDAP Attribute to map to first name (e.g., givenName)'),
missing='',
preparer=strip_whitespace,
title=_('First Name Attribute'),
widget='string')
attr_lastname = colander.SchemaNode(
colander.String(),
default='',
description=_('LDAP Attribute to map to last name (e.g., sn)'),
missing='',
preparer=strip_whitespace,
title=_('Last Name Attribute'),
widget='string')
attr_email = colander.SchemaNode(
colander.String(),
default='',
description=_('LDAP Attribute to map to email address (e.g., mail).\n'
'Emails are a crucial part of RhodeCode. \n'
'If possible add a valid email attribute to ldap users.'),
missing='',
preparer=strip_whitespace,
title=_('Email Attribute'),
widget='string')
class AuthLdap(AuthLdapBase):
def __init__(self, server, base_dn, port=389, bind_dn='', bind_pass='',
tls_kind='PLAIN', tls_reqcert='DEMAND', ldap_version=3,
search_scope='SUBTREE', attr_login='uid',
ldap_filter='', timeout=None):
if ldap == Missing:
raise LdapImportError("Missing or incompatible ldap library")
self.debug = False
self.timeout = timeout or 60 * 5
self.ldap_version = ldap_version
self.ldap_server_type = 'ldap'
self.TLS_KIND = tls_kind
if self.TLS_KIND == 'LDAPS':
port = port or 689
self.ldap_server_type += 's'
OPT_X_TLS_DEMAND = 2
self.TLS_REQCERT = getattr(ldap, 'OPT_X_TLS_%s' % tls_reqcert,
OPT_X_TLS_DEMAND)
self.LDAP_SERVER = server
# split server into list
self.SERVER_ADDRESSES = self._get_server_list(server)
self.LDAP_SERVER_PORT = port
# USE FOR READ ONLY BIND TO LDAP SERVER
self.attr_login = attr_login
self.LDAP_BIND_DN = safe_str(bind_dn)
self.LDAP_BIND_PASS = safe_str(bind_pass)
self.SEARCH_SCOPE = getattr(ldap, 'SCOPE_%s' % search_scope)
self.BASE_DN = safe_str(base_dn)
self.LDAP_FILTER = safe_str(ldap_filter)
def _get_ldap_conn(self):
if self.debug:
ldap.set_option(ldap.OPT_DEBUG_LEVEL, 255)
if hasattr(ldap, 'OPT_X_TLS_CACERTDIR'):
ldap.set_option(ldap.OPT_X_TLS_CACERTDIR, '/etc/openldap/cacerts')
if self.TLS_KIND != 'PLAIN':
ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, self.TLS_REQCERT)
ldap.set_option(ldap.OPT_REFERRALS, ldap.OPT_OFF)
ldap.set_option(ldap.OPT_RESTART, ldap.OPT_ON)
# init connection now
ldap_servers = self._build_servers(
self.ldap_server_type, self.SERVER_ADDRESSES, self.LDAP_SERVER_PORT)
log.debug('initializing LDAP connection to:%s', ldap_servers)
ldap_conn = ldap.initialize(ldap_servers)
ldap_conn.set_option(ldap.OPT_NETWORK_TIMEOUT, self.timeout)
ldap_conn.set_option(ldap.OPT_TIMEOUT, self.timeout)
ldap_conn.timeout = self.timeout
if self.ldap_version == 2:
ldap_conn.protocol = ldap.VERSION2
else:
ldap_conn.protocol = ldap.VERSION3
if self.TLS_KIND == 'START_TLS':
ldap_conn.start_tls_s()
if self.LDAP_BIND_DN and self.LDAP_BIND_PASS:
log.debug('Trying simple_bind with password and given login DN: %s',
self.LDAP_BIND_DN)
ldap_conn.simple_bind_s(self.LDAP_BIND_DN, self.LDAP_BIND_PASS)
return ldap_conn
def fetch_attrs_from_simple_bind(self, server, dn, username, password):
try:
log.debug('Trying simple bind with %s', dn)
server.simple_bind_s(dn, safe_str(password))
user = server.search_ext_s(
dn, ldap.SCOPE_BASE, '(objectClass=*)', )[0]
_, attrs = user
return attrs
except ldap.INVALID_CREDENTIALS:
log.debug(
"LDAP rejected password for user '%s': %s, org_exc:",
username, dn, exc_info=True)
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
"""
uid = self.get_uid(username, self.SERVER_ADDRESSES)
user_attrs = {}
dn = ''
if not password:
msg = "Authenticating user %s with blank password not allowed"
log.warning(msg, username)
raise LdapPasswordError(msg)
if "," in username:
raise LdapUsernameError(
"invalid character `,` in username: `{}`".format(username))
ldap_conn = None
try:
ldap_conn = self._get_ldap_conn()
filter_ = '(&%s(%s=%s))' % (
self.LDAP_FILTER, self.attr_login, username)
log.debug(
"Authenticating %r filter %s", self.BASE_DN, filter_)
lobjects = ldap_conn.search_ext_s(
self.BASE_DN, self.SEARCH_SCOPE, filter_)
if not lobjects:
log.debug("No matching LDAP objects for authentication "
"of UID:'%s' username:(%s)", uid, username)
raise ldap.NO_SUCH_OBJECT()
log.debug('Found matching ldap object, trying to authenticate')
for (dn, _attrs) in lobjects:
if dn is None:
continue
user_attrs = self.fetch_attrs_from_simple_bind(
ldap_conn, dn, username, password)
if user_attrs:
break
else:
raise LdapPasswordError(
'Failed to authenticate user `{}`'
'with given password'.format(username))
except ldap.NO_SUCH_OBJECT:
log.debug("LDAP says no such user '%s' (%s), org_exc:",
uid, username, exc_info=True)
raise LdapUsernameError('Unable to find user')
except ldap.SERVER_DOWN:
org_exc = traceback.format_exc()
raise LdapConnectionError(
"LDAP can't access authentication "
"server, org_exc:%s" % org_exc)
finally:
if ldap_conn:
log.debug('ldap: connection release')
try:
ldap_conn.unbind_s()
except Exception:
# for any reason this can raise exception we must catch it
# to not crush the server
pass
return dn, user_attrs
class RhodeCodeAuthPlugin(RhodeCodeExternalAuthPlugin):
# used to define dynamic binding in the
DYNAMIC_BIND_VAR = '$login'
_settings_unsafe_keys = ['dn_pass']
def includeme(self, config):
config.add_authn_plugin(self)
config.add_authn_resource(self.get_id(), LdapAuthnResource(self))
config.add_view(
'rhodecode.authentication.views.AuthnPluginViewBase',
attr='settings_get',
renderer='rhodecode:templates/admin/auth/plugin_settings.mako',
request_method='GET',
route_name='auth_home',
context=LdapAuthnResource)
config.add_view(
'rhodecode.authentication.views.AuthnPluginViewBase',
attr='settings_post',
renderer='rhodecode:templates/admin/auth/plugin_settings.mako',
request_method='POST',
route_name='auth_home',
context=LdapAuthnResource)
def get_settings_schema(self):
return LdapSettingsSchema()
def get_display_name(self):
return _('LDAP')
@hybrid_property
def name(self):
return "ldap"
def use_fake_password(self):
return True
def user_activation_state(self):
def_user_perms = User.get_default_user().AuthUser().permissions['global']
return 'hg.extern_activate.auto' in def_user_perms
def try_dynamic_binding(self, username, password, current_args):
"""
Detects marker inside our original bind, and uses dynamic auth if
present
"""
org_bind = current_args['bind_dn']
passwd = current_args['bind_pass']
def has_bind_marker(username):
if self.DYNAMIC_BIND_VAR in username:
return True
# we only passed in user with "special" variable
if org_bind and has_bind_marker(org_bind) and not passwd:
log.debug('Using dynamic user/password binding for ldap '
'authentication. Replacing `%s` with username',
self.DYNAMIC_BIND_VAR)
current_args['bind_dn'] = org_bind.replace(
self.DYNAMIC_BIND_VAR, username)
current_args['bind_pass'] = password
return current_args
def auth(self, userobj, username, password, settings, **kwargs):
"""
Given a user object (which may be null), username, a plaintext password,
and a settings object (containing all the keys needed as listed in
settings()), authenticate this user's login attempt.
Return None on failure. On success, return a dictionary of the form:
see: RhodeCodeAuthPluginBase.auth_func_attrs
This is later validated for correctness
"""
if not username or not password:
log.debug('Empty username or password skipping...')
return None
ldap_args = {
'server': settings.get('host', ''),
'base_dn': settings.get('base_dn', ''),
'port': settings.get('port'),
'bind_dn': settings.get('dn_user'),
'bind_pass': settings.get('dn_pass'),
'tls_kind': settings.get('tls_kind'),
'tls_reqcert': settings.get('tls_reqcert'),
'search_scope': settings.get('search_scope'),
'attr_login': settings.get('attr_login'),
'ldap_version': 3,
'ldap_filter': settings.get('filter'),
'timeout': settings.get('timeout')
}
ldap_attrs = self.try_dynamic_binding(username, password, ldap_args)
log.debug('Checking for ldap authentication.')
try:
aldap = AuthLdap(**ldap_args)
(user_dn, ldap_attrs) = aldap.authenticate_ldap(username, password)
log.debug('Got ldap DN response %s', user_dn)
def get_ldap_attr(k):
return ldap_attrs.get(settings.get(k), [''])[0]
# old attrs fetched from RhodeCode database
admin = getattr(userobj, 'admin', False)
active = getattr(userobj, 'active', True)
email = getattr(userobj, 'email', '')
username = getattr(userobj, 'username', username)
firstname = getattr(userobj, 'firstname', '')
lastname = getattr(userobj, 'lastname', '')
extern_type = getattr(userobj, 'extern_type', '')
groups = []
user_attrs = {
'username': username,
'firstname': safe_unicode(
get_ldap_attr('attr_firstname') or firstname),
'lastname': safe_unicode(
get_ldap_attr('attr_lastname') or lastname),
'groups': groups,
'user_group_sync': False,
'email': get_ldap_attr('attr_email') or email,
'admin': admin,
'active': active,
'active_from_extern': None,
'extern_name': user_dn,
'extern_type': extern_type,
}
log.debug('ldap user: %s', user_attrs)
log.info('user `%s` authenticated correctly', user_attrs['username'])
return user_attrs
except (LdapUsernameError, LdapPasswordError, LdapImportError):
log.exception("LDAP related exception")
return None
except (Exception,):
log.exception("Other exception")
return None