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