414 lines
16 KiB
Python
414 lines
16 KiB
Python
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import ldap
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import logging
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import os
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from ldap.controls import SimplePagedResultsControl
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from ldap.filter import filter_format, escape_filter_chars
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from collections import namedtuple
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from data.users.federated import FederatedUsers, UserInformation
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from util.itertoolrecipes import take
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logger = logging.getLogger(__name__)
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_DEFAULT_NETWORK_TIMEOUT = 10.0 # seconds
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_DEFAULT_TIMEOUT = 10.0 # seconds
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_DEFAULT_PAGE_SIZE = 1000
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class LDAPConnectionBuilder(object):
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def __init__(self, ldap_uri, user_dn, user_pw, allow_tls_fallback=False,
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timeout=None, network_timeout=None):
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self._ldap_uri = ldap_uri
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self._user_dn = user_dn
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self._user_pw = user_pw
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self._allow_tls_fallback = allow_tls_fallback
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self._timeout = timeout
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self._network_timeout = network_timeout
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def get_connection(self):
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return LDAPConnection(self._ldap_uri, self._user_dn, self._user_pw, self._allow_tls_fallback,
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self._timeout, self._network_timeout)
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class LDAPConnection(object):
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def __init__(self, ldap_uri, user_dn, user_pw, allow_tls_fallback=False,
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timeout=None, network_timeout=None):
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self._ldap_uri = ldap_uri
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self._user_dn = user_dn
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self._user_pw = user_pw
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self._allow_tls_fallback = allow_tls_fallback
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self._timeout = timeout
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self._network_timeout = network_timeout
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self._conn = None
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def __enter__(self):
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trace_level = 2 if os.environ.get('USERS_DEBUG') == '1' else 0
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self._conn = ldap.initialize(self._ldap_uri, trace_level=trace_level)
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self._conn.set_option(ldap.OPT_REFERRALS, 1)
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self._conn.set_option(ldap.OPT_NETWORK_TIMEOUT,
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self._network_timeout or _DEFAULT_NETWORK_TIMEOUT)
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self._conn.set_option(ldap.OPT_TIMEOUT, self._timeout or _DEFAULT_TIMEOUT)
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if self._allow_tls_fallback:
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logger.debug('TLS Fallback enabled in LDAP')
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self._conn.set_option(ldap.OPT_X_TLS_TRY, 1)
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self._conn.simple_bind_s(self._user_dn, self._user_pw)
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return self._conn
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def __exit__(self, exc_type, value, tb):
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self._conn.unbind_s()
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class LDAPUsers(FederatedUsers):
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_LDAPResult = namedtuple('LDAPResult', ['dn', 'attrs'])
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def __init__(self, ldap_uri, base_dn, admin_dn, admin_passwd, user_rdn, uid_attr, email_attr,
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allow_tls_fallback=False, secondary_user_rdns=None, requires_email=True,
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timeout=None, network_timeout=None, force_no_pagination=False):
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super(LDAPUsers, self).__init__('ldap', requires_email)
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self._ldap = LDAPConnectionBuilder(ldap_uri, admin_dn, admin_passwd, allow_tls_fallback,
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timeout, network_timeout)
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self._ldap_uri = ldap_uri
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self._uid_attr = uid_attr
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self._email_attr = email_attr
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self._allow_tls_fallback = allow_tls_fallback
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self._requires_email = requires_email
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self._force_no_pagination = force_no_pagination
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# Note: user_rdn is a list of RDN pieces (for historical reasons), and secondary_user_rds
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# is a list of RDN strings.
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relative_user_dns = [','.join(user_rdn)] + (secondary_user_rdns or [])
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def get_full_rdn(relative_dn):
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prefix = relative_dn.split(',') if relative_dn else []
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return ','.join(prefix + base_dn)
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# Create the set of full DN paths.
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self._user_dns = [get_full_rdn(relative_dn) for relative_dn in relative_user_dns]
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self._base_dn = ','.join(base_dn)
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def _get_ldap_referral_dn(self, referral_exception):
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logger.debug('Got referral: %s', referral_exception.args[0])
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if not referral_exception.args[0] or not referral_exception.args[0].get('info'):
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logger.debug('LDAP referral missing info block')
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return None
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referral_info = referral_exception.args[0]['info']
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if not referral_info.startswith('Referral:\n'):
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logger.debug('LDAP referral missing Referral header')
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return None
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referral_uri = referral_info[len('Referral:\n'):]
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if not referral_uri.startswith('ldap:///'):
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logger.debug('LDAP referral URI does not start with ldap:///')
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return None
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referral_dn = referral_uri[len('ldap:///'):]
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return referral_dn
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def _ldap_user_search_with_rdn(self, conn, username_or_email, user_search_dn, suffix=''):
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query = u'(|({0}={2}{3})({1}={2}{3}))'.format(self._uid_attr, self._email_attr,
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escape_filter_chars(username_or_email),
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suffix)
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logger.debug('Conducting user search: %s under %s', query, user_search_dn)
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try:
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return (conn.search_s(user_search_dn, ldap.SCOPE_SUBTREE, query.encode('utf-8')), None)
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except ldap.REFERRAL as re:
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referral_dn = self._get_ldap_referral_dn(re)
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if not referral_dn:
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return (None, 'Failed to follow referral when looking up username')
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try:
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subquery = u'(%s=%s)' % (self._uid_attr, username_or_email)
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return (conn.search_s(referral_dn, ldap.SCOPE_BASE, subquery), None)
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except ldap.LDAPError:
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logger.debug('LDAP referral search exception')
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return (None, 'Username not found')
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except ldap.LDAPError:
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logger.debug('LDAP search exception')
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return (None, 'Username not found')
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def _ldap_user_search(self, username_or_email, limit=20, suffix=''):
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if not username_or_email:
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return (None, 'Empty username/email')
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# Verify the admin connection works first. We do this here to avoid wrapping
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# the entire block in the INVALID CREDENTIALS check.
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try:
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with self._ldap.get_connection():
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pass
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except ldap.INVALID_CREDENTIALS:
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return (None, 'LDAP Admin dn or password is invalid')
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with self._ldap.get_connection() as conn:
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logger.debug('Incoming username or email param: %s', username_or_email.__repr__())
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for user_search_dn in self._user_dns:
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(pairs, err_msg) = self._ldap_user_search_with_rdn(conn, username_or_email, user_search_dn,
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suffix=suffix)
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if pairs is not None and len(pairs) > 0:
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break
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if err_msg is not None:
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return (None, err_msg)
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logger.debug('Found matching pairs: %s', pairs)
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results = [LDAPUsers._LDAPResult(*pair) for pair in take(limit, pairs)]
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# Filter out pairs without DNs. Some LDAP impls will return such pairs.
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with_dns = [result for result in results if result.dn]
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return (with_dns, None)
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def _ldap_single_user_search(self, username_or_email):
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with_dns, err_msg = self._ldap_user_search(username_or_email)
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if err_msg is not None:
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return (None, err_msg)
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# Make sure we have at least one result.
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if len(with_dns) < 1:
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return (None, 'Username not found')
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# If we have found a single pair, then return it.
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if len(with_dns) == 1:
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return (with_dns[0], None)
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# Otherwise, there are multiple pairs with DNs, so find the one with the mail
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# attribute (if any).
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with_mail = [result for result in with_dns if result.attrs.get(self._email_attr)]
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return (with_mail[0] if with_mail else with_dns[0], None)
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def _build_user_information(self, response):
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if not response.get(self._uid_attr):
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return (None, 'Missing uid field "%s" in user record' % self._uid_attr)
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if self._requires_email and not response.get(self._email_attr):
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return (None, 'Missing mail field "%s" in user record' % self._email_attr)
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username = response[self._uid_attr][0].decode('utf-8')
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email = response.get(self._email_attr, [None])[0]
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return (UserInformation(username=username, email=email, id=username), None)
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def ping(self):
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try:
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with self._ldap.get_connection():
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pass
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except ldap.INVALID_CREDENTIALS:
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return (False, 'LDAP Admin dn or password is invalid')
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except ldap.LDAPError as lde:
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logger.exception('Exception when trying to health check LDAP')
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return (False, lde.message)
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return (True, None)
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def at_least_one_user_exists(self):
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logger.debug('Checking if any users exist in LDAP')
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try:
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with self._ldap.get_connection():
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pass
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except ldap.INVALID_CREDENTIALS:
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return (None, 'LDAP Admin dn or password is invalid')
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has_pagination = not self._force_no_pagination
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with self._ldap.get_connection() as conn:
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for user_search_dn in self._user_dns:
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lc = ldap.controls.libldap.SimplePagedResultsControl(criticality=True, size=1, cookie='')
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try:
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if has_pagination:
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msgid = conn.search_ext(user_search_dn, ldap.SCOPE_SUBTREE, serverctrls=[lc])
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_, rdata, _, serverctrls = conn.result3(msgid)
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else:
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msgid = conn.search(user_search_dn, ldap.SCOPE_SUBTREE)
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_, rdata = conn.result(msgid)
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for entry in rdata: # Handles both lists and iterators.
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return (True, None)
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except ldap.LDAPError as lde:
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return (False, str(lde) or 'Could not find DN %s' % user_search_dn)
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return (False, None)
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def get_user(self, username_or_email):
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""" Looks up a username or email in LDAP. """
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logger.debug('Looking up LDAP username or email %s', username_or_email)
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(found_user, err_msg) = self._ldap_single_user_search(username_or_email)
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if err_msg is not None:
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return (None, err_msg)
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logger.debug('Found user for LDAP username or email %s', username_or_email)
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_, found_response = found_user
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return self._build_user_information(found_response)
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def query_users(self, query, limit=20):
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""" Queries LDAP for matching users. """
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if not query:
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return (None, self.federated_service, 'Empty query')
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logger.debug('Got query %s with limit %s', query, limit)
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(results, err_msg) = self._ldap_user_search(query, limit=limit, suffix='*')
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if err_msg is not None:
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return (None, self.federated_service, err_msg)
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final_results = []
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for result in results[0:limit]:
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credentials, err_msg = self._build_user_information(result.attrs)
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if err_msg is not None:
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continue
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final_results.append(credentials)
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logger.debug('For query %s found results %s', query, final_results)
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return (final_results, self.federated_service, None)
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def verify_credentials(self, username_or_email, password):
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""" Verify the credentials with LDAP. """
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# Make sure that even if the server supports anonymous binds, we don't allow it
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if not password:
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return (None, 'Anonymous binding not allowed')
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(found_user, err_msg) = self._ldap_single_user_search(username_or_email)
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if found_user is None:
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return (None, err_msg)
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found_dn, found_response = found_user
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logger.debug('Found user for LDAP username %s; validating password', username_or_email)
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logger.debug('DN %s found: %s', found_dn, found_response)
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# First validate the password by binding as the user
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try:
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with LDAPConnection(self._ldap_uri, found_dn, password.encode('utf-8'),
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self._allow_tls_fallback):
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pass
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except ldap.REFERRAL as re:
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referral_dn = self._get_ldap_referral_dn(re)
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if not referral_dn:
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return (None, 'Invalid username')
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try:
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with LDAPConnection(self._ldap_uri, referral_dn, password.encode('utf-8'),
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self._allow_tls_fallback):
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pass
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except ldap.INVALID_CREDENTIALS:
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logger.debug('Invalid LDAP credentials')
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return (None, 'Invalid password')
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except ldap.INVALID_CREDENTIALS:
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logger.debug('Invalid LDAP credentials')
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return (None, 'Invalid password')
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return self._build_user_information(found_response)
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def service_metadata(self):
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return {
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'base_dn': self._base_dn,
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}
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def check_group_lookup_args(self, group_lookup_args, disable_pagination=False):
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if not group_lookup_args.get('group_dn'):
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return (False, 'Missing group_dn')
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(it, err) = self.iterate_group_members(group_lookup_args, page_size=1,
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disable_pagination=disable_pagination)
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if err is not None:
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return (False, err)
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if not next(it, False):
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return (False, 'Group does not exist or is empty')
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return (True, None)
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def iterate_group_members(self, group_lookup_args, page_size=None, disable_pagination=False):
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try:
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with self._ldap.get_connection():
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pass
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except ldap.INVALID_CREDENTIALS:
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return (None, 'LDAP Admin dn or password is invalid')
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group_dn = group_lookup_args['group_dn']
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page_size = page_size or _DEFAULT_PAGE_SIZE
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return (self._iterate_members(group_dn, page_size, disable_pagination), None)
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def _iterate_members(self, group_dn, page_size, disable_pagination):
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has_pagination = not(self._force_no_pagination or disable_pagination)
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with self._ldap.get_connection() as conn:
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search_flt = filter_format('(memberOf=%s,%s)', (group_dn, self._base_dn))
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attributes = [self._uid_attr, self._email_attr]
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for user_search_dn in self._user_dns:
|
||
|
|
lc = ldap.controls.libldap.SimplePagedResultsControl(criticality=True, size=page_size,
|
||
|
|
cookie='')
|
||
|
|
|
||
|
|
# Conduct the initial search for users that are a member of the group.
|
||
|
|
logger.debug('Conducting LDAP search of DN: %s and filter %s', user_search_dn, search_flt)
|
||
|
|
try:
|
||
|
|
if has_pagination:
|
||
|
|
msgid = conn.search_ext(user_search_dn, ldap.SCOPE_SUBTREE, search_flt,
|
||
|
|
serverctrls=[lc], attrlist=attributes)
|
||
|
|
else:
|
||
|
|
msgid = conn.search(user_search_dn, ldap.SCOPE_SUBTREE, search_flt, attrlist=attributes)
|
||
|
|
except ldap.LDAPError as lde:
|
||
|
|
logger.exception('Got error when trying to search %s with filter %s: %s',
|
||
|
|
user_search_dn, search_flt, lde.message)
|
||
|
|
break
|
||
|
|
|
||
|
|
while True:
|
||
|
|
try:
|
||
|
|
if has_pagination:
|
||
|
|
_, rdata, _, serverctrls = conn.result3(msgid)
|
||
|
|
else:
|
||
|
|
_, rdata = conn.result(msgid)
|
||
|
|
|
||
|
|
# Yield any users found.
|
||
|
|
found_results = 0
|
||
|
|
for userdata in rdata:
|
||
|
|
found_results = found_results + 1
|
||
|
|
yield self._build_user_information(userdata[1])
|
||
|
|
|
||
|
|
logger.debug('Found %s users in group %s; %s', found_results, user_search_dn,
|
||
|
|
search_flt)
|
||
|
|
except ldap.NO_SUCH_OBJECT as nsoe:
|
||
|
|
logger.debug('NSO when trying to lookup results of search %s with filter %s: %s',
|
||
|
|
user_search_dn, search_flt, nsoe.message)
|
||
|
|
except ldap.LDAPError as lde:
|
||
|
|
logger.exception('Error when trying to lookup results of search %s with filter %s: %s',
|
||
|
|
user_search_dn, search_flt, lde.message)
|
||
|
|
break
|
||
|
|
|
||
|
|
# If no additional results, nothing more to do.
|
||
|
|
if not found_results:
|
||
|
|
break
|
||
|
|
|
||
|
|
# If pagination is disabled, nothing more to do.
|
||
|
|
if not has_pagination:
|
||
|
|
logger.debug('Pagination is disabled, no further queries')
|
||
|
|
break
|
||
|
|
|
||
|
|
# Filter down the controls with which the server responded, looking for the paging
|
||
|
|
# control type. If not found, then the server does not support pagination and we already
|
||
|
|
# got all of the results.
|
||
|
|
pctrls = [control for control in serverctrls
|
||
|
|
if control.controlType == ldap.controls.SimplePagedResultsControl.controlType]
|
||
|
|
|
||
|
|
if pctrls:
|
||
|
|
# Server supports pagination. Update the cookie so the next search finds the next page,
|
||
|
|
# then conduct the next search.
|
||
|
|
cookie = lc.cookie = pctrls[0].cookie
|
||
|
|
if cookie:
|
||
|
|
logger.debug('Pagination is supported for this LDAP server; trying next page')
|
||
|
|
msgid = conn.search_ext(user_search_dn, ldap.SCOPE_SUBTREE, search_flt,
|
||
|
|
serverctrls=[lc], attrlist=attributes)
|
||
|
|
continue
|
||
|
|
else:
|
||
|
|
# No additional results.
|
||
|
|
logger.debug('Pagination is supported for this LDAP server but on last page')
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
# Pagination is not supported.
|
||
|
|
logger.debug('Pagination is not supported for this LDAP server')
|
||
|
|
break
|