diff options
| -rw-r--r-- | synapse/handlers/auth.py | 279 |
1 files changed, 192 insertions, 87 deletions
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py index 6986930c0d..3933ce171a 100644 --- a/synapse/handlers/auth.py +++ b/synapse/handlers/auth.py @@ -31,6 +31,7 @@ import simplejson try: import ldap3 + import ldap3.core.exceptions except ImportError: ldap3 = None pass @@ -504,6 +505,144 @@ class AuthHandler(BaseHandler): raise LoginError(403, "", errcode=Codes.FORBIDDEN) defer.returnValue(user_id) + 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) + 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 + @defer.inlineCallbacks def _check_ldap_password(self, user_id, password): """ Attempt to authenticate a user against an LDAP Server @@ -516,106 +655,62 @@ class AuthHandler(BaseHandler): if not ldap3 or not self.ldap_enabled: defer.returnValue(False) - if self.ldap_mode not in LDAPMode.LIST: - raise RuntimeError( - 'Invalid ldap mode specified: {mode}'.format( - mode=self.ldap_mode - ) - ) + localpart = UserID.from_string(user_id).localpart try: server = ldap3.Server(self.ldap_uri) logger.debug( - "Attempting ldap connection with %s", + "Attempting LDAP connection with %s", self.ldap_uri ) - localpart = UserID.from_string(user_id).localpart if self.ldap_mode == LDAPMode.SIMPLE: - # 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 + result, conn = self._ldap_simple_bind( + server=server, localpart=localpart, password=password ) - conn = ldap3.Connection(server, bind_dn, password) logger.debug( - "Established ldap connection in simple mode: %s", + 'LDAP authentication method simple bind returned: %s (conn: %s)', + result, conn ) - - if self.ldap_start_tls: - conn.start_tls() - logger.debug( - "Upgraded ldap connection in simple mode through StartTLS: %s", - conn - ) - - conn.bind() - + if not result: + defer.returnValue(False) elif self.ldap_mode == LDAPMode.SEARCH: - # connect with preconfigured credentials and search for local user - conn = ldap3.Connection( - server, - self.ldap_bind_dn, - self.ldap_bind_password + result, conn = self._ldap_authenticated_search( + server=server, localpart=localpart, password=password ) logger.debug( - "Established ldap connection in search mode: %s", + 'LDAP auth method authenticated search returned: %s (conn: %s)', + result, conn ) - - if self.ldap_start_tls: - conn.start_tls() - logger.debug( - "Upgraded ldap connection in search mode through StartTLS: %s", - conn + if not result: + defer.returnValue(False) + else: + raise RuntimeError( + 'Invalid LDAP mode specified: {mode}'.format( + mode=self.ldap_mode ) - - conn.bind() - - # find matching dn - query = "({prop}={value})".format( - prop=self.ldap_attributes['uid'], - value=localpart ) - if self.ldap_filter: - query = "(&{query}{filter})".format( - query=query, - filter=self.ldap_filter - ) - logger.debug("ldap search filter: %s", query) - result = conn.search(self.ldap_base, query) - - if result and len(conn.response) == 1: - # found exactly one result - user_dn = conn.response[0]['dn'] - logger.debug('ldap search found dn: %s', user_dn) - - # unbind and reconnect, rebind with found dn - conn.unbind() - conn = ldap3.Connection( - server, - user_dn, - password, - auto_bind=True - ) - else: - # found 0 or > 1 results, abort! - logger.warn( - "ldap search returned unexpected (%d!=1) amount of results", - len(conn.response) - ) - defer.returnValue(False) - logger.info( - "User authenticated against ldap server: %s", - conn - ) + 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.check_user_exists(user_id)): + # exists, authentication complete + conn.unbind() + defer.returnValue(True) - # check for existing account, if none exists, create one - if not (yield self.check_user_exists(user_id)): - # query user metadata for account creation + else: + # does not exist, fetch metadata for account creation from + # existing ldap connection query = "({prop}={value})".format( prop=self.ldap_attributes['uid'], value=localpart @@ -626,9 +721,12 @@ class AuthHandler(BaseHandler): filter=query, user_filter=self.ldap_filter ) - logger.debug("ldap registration filter: %s", query) + logger.debug( + "ldap registration filter: %s", + query + ) - result = conn.search( + conn.search( search_base=self.ldap_base, search_filter=query, attributes=[ @@ -651,20 +749,27 @@ class AuthHandler(BaseHandler): # TODO: bind email, set displayname with data from ldap directory logger.info( - "ldap registration successful: %d: %s (%s, %)", + "Registration based on LDAP data was successful: %d: %s (%s, %)", user_id, localpart, name, mail ) + + defer.returnValue(True) else: - logger.warn( - "ldap registration failed: unexpected (%d!=1) amount of results", - len(conn.response) - ) + 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(True) + defer.returnValue(False) + except ldap3.core.exceptions.LDAPException as e: logger.warn("Error during ldap authentication: %s", e) defer.returnValue(False) |