auth-plugins: define unsafe settings

rhodecode/authentication/plugins/auth_crowd.py

@@ -1,283 +1,284 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2012-2017 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 Atlassian CROWD
 """
 
 
 import colander
 import base64
 import logging
 import urllib2
 
 from rhodecode.translation import _
 from rhodecode.authentication.base import (
     RhodeCodeExternalAuthPlugin, 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.ext_json import json, formatted_json
 from rhodecode.model.db import User
 
 log = logging.getLogger(__name__)
 
 
 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 CrowdAuthnResource(AuthnPluginResourceBase):
     pass
 
 
 class CrowdSettingsSchema(AuthnPluginSettingsSchemaBase):
     host = colander.SchemaNode(
         colander.String(),
         default='127.0.0.1',
         description=_('The FQDN or IP of the Atlassian CROWD Server'),
         preparer=strip_whitespace,
         title=_('Host'),
         widget='string')
     port = colander.SchemaNode(
         colander.Int(),
         default=8095,
         description=_('The Port in use by the Atlassian CROWD Server'),
         preparer=strip_whitespace,
         title=_('Port'),
         validator=colander.Range(min=0, max=65536),
         widget='int')
     app_name = colander.SchemaNode(
         colander.String(),
         default='',
         description=_('The Application Name to authenticate to CROWD'),
         preparer=strip_whitespace,
         title=_('Application Name'),
         widget='string')
     app_password = colander.SchemaNode(
         colander.String(),
         default='',
         description=_('The password to authenticate to CROWD'),
         preparer=strip_whitespace,
         title=_('Application Password'),
         widget='password')
     admin_groups = colander.SchemaNode(
         colander.String(),
         default='',
         description=_('A comma separated list of group names that identify '
                       'users as RhodeCode Administrators'),
         missing='',
         preparer=strip_whitespace,
         title=_('Admin Groups'),
         widget='string')
 
 
 class CrowdServer(object):
     def __init__(self, *args, **kwargs):
         """
         Create a new CrowdServer object that points to IP/Address 'host',
         on the given port, and using the given method (https/http). user and
         passwd can be set here or with set_credentials. If unspecified,
         "version" defaults to "latest".
 
         example::
 
             cserver = CrowdServer(host="127.0.0.1",
                                   port="8095",
                                   user="some_app",
                                   passwd="some_passwd",
                                   version="1")
         """
         if not "port" in kwargs:
             kwargs["port"] = "8095"
         self._logger = kwargs.get("logger", logging.getLogger(__name__))
         self._uri = "%s://%s:%s/crowd" % (kwargs.get("method", "http"),
                                     kwargs.get("host", "127.0.0.1"),
                                     kwargs.get("port", "8095"))
         self.set_credentials(kwargs.get("user", ""),
                              kwargs.get("passwd", ""))
         self._version = kwargs.get("version", "latest")
         self._url_list = None
         self._appname = "crowd"
 
     def set_credentials(self, user, passwd):
         self.user = user
         self.passwd = passwd
         self._make_opener()
 
     def _make_opener(self):
         mgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
         mgr.add_password(None, self._uri, self.user, self.passwd)
         handler = urllib2.HTTPBasicAuthHandler(mgr)
         self.opener = urllib2.build_opener(handler)
 
     def _request(self, url, body=None, headers=None,
                  method=None, noformat=False,
                  empty_response_ok=False):
         _headers = {"Content-type": "application/json",
                     "Accept": "application/json"}
         if self.user and self.passwd:
             authstring = base64.b64encode("%s:%s" % (self.user, self.passwd))
             _headers["Authorization"] = "Basic %s" % authstring
         if headers:
             _headers.update(headers)
         log.debug("Sent crowd: \n%s"
                   % (formatted_json({"url": url, "body": body,
                                            "headers": _headers})))
         request = urllib2.Request(url, body, _headers)
         if method:
             request.get_method = lambda: method
 
         global msg
         msg = ""
         try:
             rdoc = self.opener.open(request)
             msg = "".join(rdoc.readlines())
             if not msg and empty_response_ok:
                 rval = {}
                 rval["status"] = True
                 rval["error"] = "Response body was empty"
             elif not noformat:
                 rval = json.loads(msg)
                 rval["status"] = True
             else:
                 rval = "".join(rdoc.readlines())
         except Exception as e:
             if not noformat:
                 rval = {"status": False,
                         "body": body,
                         "error": str(e) + "\n" + msg}
             else:
                 rval = None
         return rval
 
     def user_auth(self, username, password):
         """Authenticate a user against crowd. Returns brief information about
         the user."""
         url = ("%s/rest/usermanagement/%s/authentication?username=%s"
                % (self._uri, self._version, username))
         body = json.dumps({"value": password})
         return self._request(url, body)
 
     def user_groups(self, username):
         """Retrieve a list of groups to which this user belongs."""
         url = ("%s/rest/usermanagement/%s/user/group/nested?username=%s"
                % (self._uri, self._version, username))
         return self._request(url)
 
 
 class RhodeCodeAuthPlugin(RhodeCodeExternalAuthPlugin):
+    _settings_unsafe_keys = ['app_password']
 
     def includeme(self, config):
         config.add_authn_plugin(self)
         config.add_authn_resource(self.get_id(), CrowdAuthnResource(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=CrowdAuthnResource)
         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=CrowdAuthnResource)
 
     def get_settings_schema(self):
         return CrowdSettingsSchema()
 
     def get_display_name(self):
         return _('CROWD')
 
     @hybrid_property
     def name(self):
         return "crowd"
 
     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 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
 
         log.debug("Crowd settings: \n%s" % (formatted_json(settings)))
         server = CrowdServer(**settings)
         server.set_credentials(settings["app_name"], settings["app_password"])
         crowd_user = server.user_auth(username, password)
         log.debug("Crowd returned: \n%s" % (formatted_json(crowd_user)))
         if not crowd_user["status"]:
             return None
 
         res = server.user_groups(crowd_user["name"])
         log.debug("Crowd groups: \n%s" % (formatted_json(res)))
         crowd_user["groups"] = [x["name"] for x in res["groups"]]
 
         # 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', '')
 
         user_attrs = {
             'username': username,
             'firstname': crowd_user["first-name"] or firstname,
             'lastname': crowd_user["last-name"] or lastname,
             'groups': crowd_user["groups"],
             'email': crowd_user["email"] or email,
             'admin': admin,
             'active': active,
             'active_from_extern': crowd_user.get('active'),
             'extern_name': crowd_user["name"],
             'extern_type': extern_type,
         }
 
         # set an admin if we're in admin_groups of crowd
         for group in settings["admin_groups"]:
             if group in user_attrs["groups"]:
                 user_attrs["admin"] = True
         log.debug("Final crowd user object: \n%s" % (formatted_json(user_attrs)))
         log.info('user %s authenticated correctly' % user_attrs['username'])
         return user_attrs

rhodecode/authentication/plugins/auth_ldap.py

@@ -1,473 +1,474 b''
 # -*- coding: utf-8 -*-
 
 # Copyright (C) 2010-2017 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 colander
 import logging
 import traceback
 
 from rhodecode.translation import _
 from rhodecode.authentication.base import (
     RhodeCodeExternalAuthPlugin, chop_at, 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
 
 
 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 of the LDAP Server \n'
                       '(e.g., 192.168.2.154, or ldap-server.domain.com'),
         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: 389'),
         preparer=strip_whitespace,
         title=_('Port'),
         validator=colander.Range(min=0, max=65536),
         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 [e-mail]'),
         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?'),
         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(object):
 
     def _build_servers(self):
         return ', '.join(
             ["{}://{}:{}".format(
                 self.ldap_server_type, host.strip(), self.LDAP_SERVER_PORT)
              for host in self.SERVER_ADDRESSES])
 
     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=None):
         if ldap == Missing:
             raise LdapImportError("Missing or incompatible ldap library")
 
         self.debug = False
         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)
         # split server into list
         self.SERVER_ADDRESSES = server.split(',')
         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.LDAP_SERVER = self._build_servers()
         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_server(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')
         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.TLS_KIND != 'PLAIN':
             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.TLS_KIND == 'START_TLS':
             server.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)
             server.simple_bind_s(self.LDAP_BIND_DN, self.LDAP_BIND_PASS)
 
         return server
 
     def get_uid(self, username):
         uid = username
         for server_addr in self.SERVER_ADDRESSES:
             uid = chop_at(username, "@%s" % server_addr)
         return uid
 
     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)
 
         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: ,")
         try:
             server = self._get_ldap_server()
             filter_ = '(&%s(%s=%s))' % (
                 self.LDAP_FILTER, self.attr_login, username)
             log.debug("Authenticating %r filter %s at %s", self.BASE_DN,
                       filter_, self.LDAP_SERVER)
             lobjects = server.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(
                     server, dn, username, password)
                 if user_attrs:
                     break
 
             else:
                 raise LdapPasswordError('Failed to authenticate user '
                                         'with given password')
 
         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)
 
         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'),
         }
 
         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,
                 '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