diff options
Diffstat (limited to 'synapse/util')
| -rw-r--r-- | synapse/util/ldap_auth_provider.py | 369 |
1 files changed, 0 insertions, 369 deletions
diff --git a/synapse/util/ldap_auth_provider.py b/synapse/util/ldap_auth_provider.py deleted file mode 100644 index 1b989248fb..0000000000 --- a/synapse/util/ldap_auth_provider.py +++ /dev/null @@ -1,369 +0,0 @@ - -from twisted.internet import defer - -from synapse.config._base import ConfigError -from synapse.types import UserID - -import ldap3 -import ldap3.core.exceptions - -import logging - -try: - import ldap3 - import ldap3.core.exceptions -except ImportError: - ldap3 = None - pass - - -logger = logging.getLogger(__name__) - - -class LDAPMode(object): - SIMPLE = "simple", - SEARCH = "search", - - LIST = (SIMPLE, SEARCH) - - -class LdapAuthProvider(object): - __version__ = "0.1" - - def __init__(self, config, account_handler): - self.account_handler = account_handler - - if not ldap3: - raise RuntimeError( - 'Missing ldap3 library. This is required for LDAP Authentication.' - ) - - self.ldap_mode = config.mode - self.ldap_uri = config.uri - self.ldap_start_tls = config.start_tls - self.ldap_base = config.base - self.ldap_attributes = config.attributes - if self.ldap_mode == LDAPMode.SEARCH: - self.ldap_bind_dn = config.bind_dn - self.ldap_bind_password = config.bind_password - self.ldap_filter = config.filter - - @defer.inlineCallbacks - def check_password(self, user_id, password): - """ Attempt to authenticate a user against an LDAP Server - and register an account if none exists. - - Returns: - True if authentication against LDAP was successful - """ - localpart = UserID.from_string(user_id).localpart - - try: - server = ldap3.Server(self.ldap_uri) - logger.debug( - "Attempting LDAP connection with %s", - self.ldap_uri - ) - - if self.ldap_mode == LDAPMode.SIMPLE: - result, conn = self._ldap_simple_bind( - server=server, localpart=localpart, password=password - ) - logger.debug( - 'LDAP authentication method simple bind returned: %s (conn: %s)', - result, - conn - ) - if not result: - defer.returnValue(False) - elif self.ldap_mode == LDAPMode.SEARCH: - result, conn = self._ldap_authenticated_search( - server=server, localpart=localpart, password=password - ) - logger.debug( - 'LDAP auth method authenticated search returned: %s (conn: %s)', - result, - conn - ) - if not result: - defer.returnValue(False) - else: - raise RuntimeError( - 'Invalid LDAP mode specified: {mode}'.format( - mode=self.ldap_mode - ) - ) - - try: - logger.info( - "User authenticated against LDAP server: %s", - conn - ) - except NameError: - logger.warn( - "Authentication method yielded no LDAP connection, aborting!" - ) - defer.returnValue(False) - - # check if user with user_id exists - if (yield self.account_handler.check_user_exists(user_id)): - # exists, authentication complete - conn.unbind() - defer.returnValue(True) - - else: - # does not exist, fetch metadata for account creation from - # existing ldap connection - query = "({prop}={value})".format( - prop=self.ldap_attributes['uid'], - value=localpart - ) - - if self.ldap_mode == LDAPMode.SEARCH and self.ldap_filter: - query = "(&{filter}{user_filter})".format( - filter=query, - user_filter=self.ldap_filter - ) - logger.debug( - "ldap registration filter: %s", - query - ) - - conn.search( - search_base=self.ldap_base, - search_filter=query, - attributes=[ - self.ldap_attributes['name'], - self.ldap_attributes['mail'] - ] - ) - - if len(conn.response) == 1: - attrs = conn.response[0]['attributes'] - mail = attrs[self.ldap_attributes['mail']][0] - name = attrs[self.ldap_attributes['name']][0] - - # create account - user_id, access_token = ( - yield self.account_handler.register(localpart=localpart) - ) - - # TODO: bind email, set displayname with data from ldap directory - - logger.info( - "Registration based on LDAP data was successful: %d: %s (%s, %)", - user_id, - localpart, - name, - mail - ) - - defer.returnValue(True) - else: - if len(conn.response) == 0: - logger.warn("LDAP registration failed, no result.") - else: - logger.warn( - "LDAP registration failed, too many results (%s)", - len(conn.response) - ) - - defer.returnValue(False) - - defer.returnValue(False) - - except ldap3.core.exceptions.LDAPException as e: - logger.warn("Error during ldap authentication: %s", e) - defer.returnValue(False) - - @staticmethod - def parse_config(config): - class _LdapConfig(object): - pass - - ldap_config = _LdapConfig() - - ldap_config.enabled = config.get("enabled", False) - - ldap_config.mode = LDAPMode.SIMPLE - - # verify config sanity - _require_keys(config, [ - "uri", - "base", - "attributes", - ]) - - ldap_config.uri = config["uri"] - ldap_config.start_tls = config.get("start_tls", False) - ldap_config.base = config["base"] - ldap_config.attributes = config["attributes"] - - if "bind_dn" in config: - ldap_config.mode = LDAPMode.SEARCH - _require_keys(config, [ - "bind_dn", - "bind_password", - ]) - - ldap_config.bind_dn = config["bind_dn"] - ldap_config.bind_password = config["bind_password"] - ldap_config.filter = config.get("filter", None) - - # verify attribute lookup - _require_keys(config['attributes'], [ - "uid", - "name", - "mail", - ]) - - return ldap_config - - def _ldap_simple_bind(self, server, localpart, password): - """ Attempt a simple bind with the credentials - given by the user against the LDAP server. - - Returns True, LDAP3Connection - if the bind was successful - Returns False, None - if an error occured - """ - - try: - # bind with the the local users ldap credentials - bind_dn = "{prop}={value},{base}".format( - prop=self.ldap_attributes['uid'], - value=localpart, - base=self.ldap_base - ) - conn = ldap3.Connection(server, bind_dn, password, - authentication=ldap3.AUTH_SIMPLE) - logger.debug( - "Established LDAP connection in simple bind mode: %s", - conn - ) - - if self.ldap_start_tls: - conn.start_tls() - logger.debug( - "Upgraded LDAP connection in simple bind mode through StartTLS: %s", - conn - ) - - if conn.bind(): - # GOOD: bind okay - logger.debug("LDAP Bind successful in simple bind mode.") - return True, conn - - # BAD: bind failed - logger.info( - "Binding against LDAP failed for '%s' failed: %s", - localpart, conn.result['description'] - ) - conn.unbind() - return False, None - - except ldap3.core.exceptions.LDAPException as e: - logger.warn("Error during LDAP authentication: %s", e) - return False, None - - def _ldap_authenticated_search(self, server, localpart, password): - """ Attempt to login with the preconfigured bind_dn - and then continue searching and filtering within - the base_dn - - Returns (True, LDAP3Connection) - if a single matching DN within the base was found - that matched the filter expression, and with which - a successful bind was achieved - - The LDAP3Connection returned is the instance that was used to - verify the password not the one using the configured bind_dn. - Returns (False, None) - if an error occured - """ - - try: - conn = ldap3.Connection( - server, - self.ldap_bind_dn, - self.ldap_bind_password - ) - logger.debug( - "Established LDAP connection in search mode: %s", - conn - ) - - if self.ldap_start_tls: - conn.start_tls() - logger.debug( - "Upgraded LDAP connection in search mode through StartTLS: %s", - conn - ) - - if not conn.bind(): - logger.warn( - "Binding against LDAP with `bind_dn` failed: %s", - conn.result['description'] - ) - conn.unbind() - return False, None - - # construct search_filter like (uid=localpart) - query = "({prop}={value})".format( - prop=self.ldap_attributes['uid'], - value=localpart - ) - if self.ldap_filter: - # combine with the AND expression - query = "(&{query}{filter})".format( - query=query, - filter=self.ldap_filter - ) - logger.debug( - "LDAP search filter: %s", - query - ) - conn.search( - search_base=self.ldap_base, - search_filter=query - ) - - if len(conn.response) == 1: - # GOOD: found exactly one result - user_dn = conn.response[0]['dn'] - logger.debug('LDAP search found dn: %s', user_dn) - - # unbind and simple bind with user_dn to verify the password - # Note: do not use rebind(), for some reason it did not verify - # the password for me! - conn.unbind() - return self._ldap_simple_bind(server, localpart, password) - else: - # BAD: found 0 or > 1 results, abort! - if len(conn.response) == 0: - logger.info( - "LDAP search returned no results for '%s'", - localpart - ) - else: - logger.info( - "LDAP search returned too many (%s) results for '%s'", - len(conn.response), localpart - ) - conn.unbind() - return False, None - - except ldap3.core.exceptions.LDAPException as e: - logger.warn("Error during LDAP authentication: %s", e) - return False, None - - -def _require_keys(config, required): - missing = [key for key in required if key not in config] - if missing: - raise ConfigError( - "LDAP enabled but missing required config values: {}".format( - ", ".join(missing) - ) - ) |