server/sources/ldapfeed.py
author Julien Cristau <julien.cristau@logilab.fr>
Thu, 23 Jan 2014 12:32:16 +0100
changeset 9468 39b7a91a3f4c
parent 9462 375fc1868b11
child 9512 88dc96fc9fc1
permissions -rw-r--r--
[repo] pylint cleanup, mainly of imports, with a bit of style
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""cubicweb ldap feed source"""
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from __future__ import division # XXX why?
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from datetime import datetime
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import ldap
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from ldap.ldapobject import ReconnectLDAPObject
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from ldap.filter import filter_format
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from ldapurl import LDAPUrl
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from logilab.common.configuration import merge_options
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from cubicweb import ValidationError, AuthenticationError, Binary
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from cubicweb.server import utils
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from cubicweb.server.sources import datafeed
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_ = unicode
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# search scopes
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BASE = ldap.SCOPE_BASE
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ONELEVEL = ldap.SCOPE_ONELEVEL
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SUBTREE = ldap.SCOPE_SUBTREE
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LDAP_SCOPES = {'BASE': ldap.SCOPE_BASE,
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               'ONELEVEL': ldap.SCOPE_ONELEVEL,
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               'SUBTREE': ldap.SCOPE_SUBTREE}
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# map ldap protocol to their standard port
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PROTO_PORT = {'ldap': 389,
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              'ldaps': 636,
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              'ldapi': None,
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              }
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class LDAPFeedSource(datafeed.DataFeedSource):
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    """LDAP feed source: unlike ldapuser source, this source is copy based and
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    will import ldap content (beside passwords for authentication) into the
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    system source.
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    """
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    support_entities = {'CWUser': False}
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    use_cwuri_as_url = False
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    options = (
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        ('auth-mode',
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         {'type' : 'choice',
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          'default': 'simple',
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          'choices': ('simple', 'cram_md5', 'digest_md5', 'gssapi'),
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          'help': 'authentication mode used to authenticate user to the ldap.',
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          'group': 'ldap-source', 'level': 3,
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          }),
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        ('auth-realm',
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         {'type' : 'string',
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          'default': None,
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          'help': 'realm to use when using gssapi/kerberos authentication.',
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          'group': 'ldap-source', 'level': 3,
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          }),
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        ('data-cnx-dn',
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         {'type' : 'string',
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          'default': '',
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          'help': 'user dn to use to open data connection to the ldap (eg used \
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to respond to rql queries). Leave empty for anonymous bind',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('data-cnx-password',
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         {'type' : 'string',
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          'default': '',
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          'help': 'password to use to open data connection to the ldap (eg used to respond to rql queries). Leave empty for anonymous bind.',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('user-base-dn',
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         {'type' : 'string',
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          'default': '',
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          'help': 'base DN to lookup for users; disable user importation mechanism if unset',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('user-scope',
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         {'type' : 'choice',
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          'default': 'ONELEVEL',
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          'choices': ('BASE', 'ONELEVEL', 'SUBTREE'),
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          'help': 'user search scope (valid values: "BASE", "ONELEVEL", "SUBTREE")',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('user-classes',
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         {'type' : 'csv',
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          'default': ('top', 'posixAccount'),
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          'help': 'classes of user (with Active Directory, you want to say "user" here)',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('user-filter',
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         {'type': 'string',
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          'default': '',
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          'help': 'additional filters to be set in the ldap query to find valid users',
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          'group': 'ldap-source', 'level': 2,
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          }),
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        ('user-login-attr',
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         {'type' : 'string',
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          'default': 'uid',
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          'help': 'attribute used as login on authentication (with Active Directory, you want to use "sAMAccountName" here)',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('user-default-group',
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         {'type' : 'csv',
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          'default': ('users',),
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          'help': 'name of a group in which ldap users will be by default. \
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You can set multiple groups by separating them by a comma.',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('user-attrs-map',
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         {'type' : 'named',
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          'default': {'uid': 'login', 'gecos': 'email', 'userPassword': 'upassword'},
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          'help': 'map from ldap user attributes to cubicweb attributes (with Active Directory, you want to use sAMAccountName:login,mail:email,givenName:firstname,sn:surname)',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('group-base-dn',
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         {'type' : 'string',
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          'default': '',
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          'help': 'base DN to lookup for groups; disable group importation mechanism if unset',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('group-scope',
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         {'type' : 'choice',
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          'default': 'ONELEVEL',
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          'choices': ('BASE', 'ONELEVEL', 'SUBTREE'),
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          'help': 'group search scope (valid values: "BASE", "ONELEVEL", "SUBTREE")',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('group-classes',
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         {'type' : 'csv',
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          'default': ('top', 'posixGroup'),
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          'help': 'classes of group',
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          'group': 'ldap-source', 'level': 1,
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          }),
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        ('group-filter',
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         {'type': 'string',
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          'default': '',
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          'help': 'additional filters to be set in the ldap query to find valid groups',
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          'group': 'ldap-source', 'level': 2,
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          }),
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        ('group-attrs-map',
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         {'type' : 'named',
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          'default': {'cn': 'name', 'memberUid': 'member'},
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          'help': 'map from ldap group attributes to cubicweb attributes',
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          'group': 'ldap-source', 'level': 1,
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          }),
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    )
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    options = merge_options(datafeed.DataFeedSource.options + options,
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                            optgroup='ldap-source',)
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    _conn = None
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    def update_config(self, source_entity, typedconfig):
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        """update configuration from source entity. `typedconfig` is config
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        properly typed with defaults set
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        """
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        super(LDAPFeedSource, self).update_config(source_entity, typedconfig)
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        self.authmode = typedconfig['auth-mode']
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        self._authenticate = getattr(self, '_auth_%s' % self.authmode)
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        self.cnx_dn = typedconfig['data-cnx-dn']
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        self.cnx_pwd = typedconfig['data-cnx-password']
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        self.user_base_dn = str(typedconfig['user-base-dn'])
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        self.user_base_scope = globals()[typedconfig['user-scope']]
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        self.user_login_attr = typedconfig['user-login-attr']
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        self.user_default_groups = typedconfig['user-default-group']
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        self.user_attrs = {'dn': 'eid', 'modifyTimestamp': 'modification_date'}
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        self.user_attrs.update(typedconfig['user-attrs-map'])
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        self.user_rev_attrs = dict((v, k) for k, v in self.user_attrs.iteritems())
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        self.base_filters = [filter_format('(%s=%s)', ('objectClass', o))
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                             for o in typedconfig['user-classes']]
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        if typedconfig['user-filter']:
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            self.base_filters.append(typedconfig['user-filter'])
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        self.group_base_dn = str(typedconfig['group-base-dn'])
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        self.group_base_scope = LDAP_SCOPES[typedconfig['group-scope']]
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        self.group_attrs = typedconfig['group-attrs-map']
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        self.group_attrs = {'dn': 'eid', 'modifyTimestamp': 'modification_date'}
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        self.group_attrs.update(typedconfig['group-attrs-map'])
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        self.group_rev_attrs = dict((v, k) for k, v in self.group_attrs.iteritems())
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        self.group_base_filters = [filter_format('(%s=%s)', ('objectClass', o))
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                                   for o in typedconfig['group-classes']]
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        if typedconfig['group-filter']:
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            self.group_base_filters.append(typedconfig['group-filter'])
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        self._conn = None
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    def _entity_update(self, source_entity):
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        super(LDAPFeedSource, self)._entity_update(source_entity)
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        if self.urls:
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            if len(self.urls) > 1:
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                raise ValidationError(source_entity.eid, {'url': _('can only have one url')})
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   208
            try:
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   209
                protocol, hostport = self.urls[0].split('://')
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   210
            except ValueError:
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   211
                raise ValidationError(source_entity.eid, {'url': _('badly formatted url')})
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   212
            if protocol not in PROTO_PORT:
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   213
                raise ValidationError(source_entity.eid, {'url': _('unsupported protocol')})
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   214
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   215
    def connection_info(self):
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   216
        assert len(self.urls) == 1, self.urls
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   217
        protocol, hostport = self.urls[0].split('://')
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   218
        if protocol != 'ldapi' and not ':' in hostport:
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   219
            hostport = '%s:%s' % (hostport, PROTO_PORT[protocol])
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   220
        return protocol, hostport
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   221
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   222
    def authenticate(self, session, login, password=None, **kwargs):
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   223
        """return CWUser eid for the given login/password if this account is
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   224
        defined in this source, else raise `AuthenticationError`
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   225
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   226
        two queries are needed since passwords are stored crypted, so we have
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   227
        to fetch the salt first
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   228
        """
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   229
        self.info('ldap authenticate %s', login)
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   230
        if not password:
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   231
            # On Windows + ADAM this would have succeeded (!!!)
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   232
            # You get Authenticated as: 'NT AUTHORITY\ANONYMOUS LOGON'.
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   233
            # we really really don't want that
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   234
            raise AuthenticationError()
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   235
        searchfilter = [filter_format('(%s=%s)', (self.user_login_attr, login))]
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   236
        searchfilter.extend(self.base_filters)
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   237
        searchstr = '(&%s)' % ''.join(searchfilter)
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   238
        # first search the user
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   239
        try:
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   240
            user = self._search(session, self.user_base_dn,
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diff changeset
   241
                                self.user_base_scope, searchstr)[0]
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diff changeset
   242
        except (IndexError, ldap.SERVER_DOWN):
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   243
            # no such user
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   244
            raise AuthenticationError()
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   245
        # check password by establishing a (unused) connection
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diff changeset
   246
        try:
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   247
            self._connect(user, password)
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   248
        except ldap.LDAPError as ex:
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   249
            # Something went wrong, most likely bad credentials
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   250
            self.info('while trying to authenticate %s: %s', user, ex)
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   251
            raise AuthenticationError()
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   252
        except Exception:
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   253
            self.error('while trying to authenticate %s', user, exc_info=True)
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   254
            raise AuthenticationError()
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diff changeset
   255
        eid = self.repo.extid2eid(self, user['dn'], 'CWUser', session, {})
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   256
        if eid < 0:
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   257
            # user has been moved away from this source
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   258
            raise AuthenticationError()
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   259
        return eid
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diff changeset
   260
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diff changeset
   261
    def _connect(self, user=None, userpwd=None):
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diff changeset
   262
        protocol, hostport = self.connection_info()
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diff changeset
   263
        self.info('connecting %s://%s as %s', protocol, hostport,
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diff changeset
   264
                  user and user['dn'] or 'anonymous')
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diff changeset
   265
        # don't require server certificate when using ldaps (will
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diff changeset
   266
        # enable self signed certs)
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   267
        ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, ldap.OPT_X_TLS_NEVER)
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diff changeset
   268
        url = LDAPUrl(urlscheme=protocol, hostport=hostport)
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diff changeset
   269
        conn = ReconnectLDAPObject(url.initializeUrl())
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diff changeset
   270
        # Set the protocol version - version 3 is preferred
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diff changeset
   271
        try:
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   272
            conn.set_option(ldap.OPT_PROTOCOL_VERSION, ldap.VERSION3)
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diff changeset
   273
        except ldap.LDAPError: # Invalid protocol version, fall back safely
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diff changeset
   274
            conn.set_option(ldap.OPT_PROTOCOL_VERSION, ldap.VERSION2)
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   275
        # Deny auto-chasing of referrals to be safe, we handle them instead
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diff changeset
   276
        # Required for AD
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   277
        try:
9468
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diff changeset
   278
            conn.set_option(ldap.OPT_REFERRALS, 0)
9461
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diff changeset
   279
        except ldap.LDAPError: # Cannot set referrals, so do nothing
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   280
            pass
9461
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diff changeset
   281
        #conn.set_option(ldap.OPT_NETWORK_TIMEOUT, conn_timeout)
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diff changeset
   282
        #conn.timeout = op_timeout
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diff changeset
   283
        # Now bind with the credentials given. Let exceptions propagate out.
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diff changeset
   284
        if user is None:
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diff changeset
   285
            # XXX always use simple bind for data connection
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diff changeset
   286
            if not self.cnx_dn:
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diff changeset
   287
                conn.simple_bind_s(self.cnx_dn, self.cnx_pwd)
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diff changeset
   288
            else:
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diff changeset
   289
                self._authenticate(conn, {'dn': self.cnx_dn}, self.cnx_pwd)
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diff changeset
   290
        else:
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diff changeset
   291
            # user specified, we want to check user/password, no need to return
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diff changeset
   292
            # the connection which will be thrown out
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diff changeset
   293
            self._authenticate(conn, user, userpwd)
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diff changeset
   294
        return conn
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diff changeset
   295
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diff changeset
   296
    def _auth_simple(self, conn, user, userpwd):
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diff changeset
   297
        conn.simple_bind_s(user['dn'], userpwd)
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diff changeset
   298
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diff changeset
   299
    def _auth_cram_md5(self, conn, user, userpwd):
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diff changeset
   300
        from ldap import sasl
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diff changeset
   301
        auth_token = sasl.cram_md5(user['dn'], userpwd)
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diff changeset
   302
        conn.sasl_interactive_bind_s('', auth_token)
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diff changeset
   303
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diff changeset
   304
    def _auth_digest_md5(self, conn, user, userpwd):
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diff changeset
   305
        from ldap import sasl
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diff changeset
   306
        auth_token = sasl.digest_md5(user['dn'], userpwd)
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diff changeset
   307
        conn.sasl_interactive_bind_s('', auth_token)
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diff changeset
   308
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   309
    def _auth_gssapi(self, conn, user, userpwd):
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   310
        # print XXX not proper sasl/gssapi
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diff changeset
   311
        import kerberos
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   312
        if not kerberos.checkPassword(user[self.user_login_attr], userpwd):
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   313
            raise Exception('BAD login / mdp')
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diff changeset
   314
        #from ldap import sasl
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diff changeset
   315
        #conn.sasl_interactive_bind_s('', sasl.gssapi())
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parents: 8989
diff changeset
   316
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   317
    def _search(self, session, base, scope,
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   318
                searchstr='(objectClass=*)', attrs=()):
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   319
        """make an ldap query"""
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   320
        self.debug('ldap search %s %s %s %s %s', self.uri, base, scope,
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diff changeset
   321
                   searchstr, list(attrs))
9462
375fc1868b11 [ldap] simplify connection handling
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diff changeset
   322
        if self._conn is None:
375fc1868b11 [ldap] simplify connection handling
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diff changeset
   323
            self._conn = self._connect()
375fc1868b11 [ldap] simplify connection handling
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diff changeset
   324
        cnx = self._conn
9461
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   325
        try:
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parents: 8989
diff changeset
   326
            res = cnx.search_s(base, scope, searchstr, attrs)
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   327
        except ldap.PARTIAL_RESULTS:
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parents: 8989
diff changeset
   328
            res = cnx.result(all=0)[1]
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parents: 8989
diff changeset
   329
        except ldap.NO_SUCH_OBJECT:
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diff changeset
   330
            self.info('ldap NO SUCH OBJECT %s %s %s', base, scope, searchstr)
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diff changeset
   331
            self._process_no_such_object(session, base)
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diff changeset
   332
            return []
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diff changeset
   333
        # except ldap.REFERRAL as e:
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diff changeset
   334
        #     cnx = self.handle_referral(e)
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diff changeset
   335
        #     try:
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diff changeset
   336
        #         res = cnx.search_s(base, scope, searchstr, attrs)
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diff changeset
   337
        #     except ldap.PARTIAL_RESULTS:
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parents: 8989
diff changeset
   338
        #         res_type, res = cnx.result(all=0)
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diff changeset
   339
        result = []
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diff changeset
   340
        for rec_dn, rec_dict in res:
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parents: 8989
diff changeset
   341
            # When used against Active Directory, "rec_dict" may not be
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   342
            # be a dictionary in some cases (instead, it can be a list)
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diff changeset
   343
            #
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   344
            # An example of a useless "res" entry that can be ignored
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diff changeset
   345
            # from AD is
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diff changeset
   346
            # (None, ['ldap://ForestDnsZones.PORTAL.LOCAL/DC=ForestDnsZones,DC=PORTAL,DC=LOCAL'])
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diff changeset
   347
            # This appears to be some sort of internal referral, but
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   348
            # we can't handle it, so we need to skip over it.
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   349
            try:
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   350
                items = rec_dict.iteritems()
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diff changeset
   351
            except AttributeError:
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   352
                continue
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diff changeset
   353
            else:
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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parents: 8989
diff changeset
   354
                itemdict = self._process_ldap_item(rec_dn, items)
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   355
                result.append(itemdict)
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diff changeset
   356
        self.debug('ldap built results %s', len(result))
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   357
        return result
8922
715b9eec6da9 [ldapfeed] Add support for LDAP groups (closes #2528116)
David Douard <david.douard@logilab.fr>
parents: 8708
diff changeset
   358
715b9eec6da9 [ldapfeed] Add support for LDAP groups (closes #2528116)
David Douard <david.douard@logilab.fr>
parents: 8708
diff changeset
   359
    def _process_ldap_item(self, dn, iterator):
9461
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   360
        """Turn an ldap received item into a proper dict."""
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diff changeset
   361
        itemdict = {'dn': dn}
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diff changeset
   362
        for key, value in iterator:
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diff changeset
   363
            if self.user_attrs.get(key) == 'upassword': # XXx better password detection
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diff changeset
   364
                value = value[0].encode('utf-8')
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   365
                # we only support ldap_salted_sha1 for ldap sources, see: server/utils.py
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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diff changeset
   366
                if not value.startswith('{SSHA}'):
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diff changeset
   367
                    value = utils.crypt_password(value)
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diff changeset
   368
                itemdict[key] = Binary(value)
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diff changeset
   369
            elif self.user_attrs.get(key) == 'modification_date':
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diff changeset
   370
                itemdict[key] = datetime.strptime(value[0], '%Y%m%d%H%M%SZ')
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diff changeset
   371
            else:
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parents: 8989
diff changeset
   372
                value = [unicode(val, 'utf-8', 'replace') for val in value]
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diff changeset
   373
                if len(value) == 1:
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diff changeset
   374
                    itemdict[key] = value = value[0]
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parents: 8989
diff changeset
   375
                else:
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parents: 8989
diff changeset
   376
                    itemdict[key] = value
8922
715b9eec6da9 [ldapfeed] Add support for LDAP groups (closes #2528116)
David Douard <david.douard@logilab.fr>
parents: 8708
diff changeset
   377
        # we expect memberUid to be a list of user ids, make sure of it
715b9eec6da9 [ldapfeed] Add support for LDAP groups (closes #2528116)
David Douard <david.douard@logilab.fr>
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diff changeset
   378
        member = self.group_rev_attrs['member']
715b9eec6da9 [ldapfeed] Add support for LDAP groups (closes #2528116)
David Douard <david.douard@logilab.fr>
parents: 8708
diff changeset
   379
        if isinstance(itemdict.get(member), basestring):
715b9eec6da9 [ldapfeed] Add support for LDAP groups (closes #2528116)
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parents: 8708
diff changeset
   380
            itemdict[member] = [itemdict[member]]
715b9eec6da9 [ldapfeed] Add support for LDAP groups (closes #2528116)
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diff changeset
   381
        return itemdict
9461
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diff changeset
   382
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diff changeset
   383
    def _process_no_such_object(self, session, dn):
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parents: 8989
diff changeset
   384
        """Some search return NO_SUCH_OBJECT error, handle this (usually because
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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parents: 8989
diff changeset
   385
        an object whose dn is no more existent in ldap as been encountered).
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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parents: 8989
diff changeset
   386
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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parents: 8989
diff changeset
   387
        Do nothing by default, let sub-classes handle that.
fc3b8798737c [ldap] merge cw.server.ldaputils back into ldapfeed source
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parents: 8989
diff changeset
   388
        """