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Merge pull request #1155 from matrix-org/erikj/pluggable_pwd_auth

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Implement pluggable password auth
This commit is contained in:
Erik Johnston 2016-10-12 11:41:20 +01:00 • committed by GitHub
commit 35e2cc8b52
7 changed files with 486 additions and 401 deletions
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334
synapse/handlers/auth.py
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@ -20,7 +20,6 @@ from synapse.api.constants import LoginType
from synapse.types import UserID
from synapse.api.errors import AuthError, LoginError, Codes, StoreError, SynapseError
from synapse.util.async import run_on_reactor
from synapse.config.ldap import LDAPMode
from twisted.web.client import PartialDownloadError
@ -29,13 +28,6 @@ import bcrypt
import pymacaroons
import simplejson
try:
import ldap3
import ldap3.core.exceptions
except ImportError:
ldap3 = None
pass
import synapse.util.stringutils as stringutils
@ -60,21 +52,14 @@ class AuthHandler(BaseHandler):
self.bcrypt_rounds = hs.config.bcrypt_rounds
self.sessions = {}
self.ldap_enabled = hs.config.ldap_enabled
if self.ldap_enabled:
if not ldap3:
raise RuntimeError(
'Missing ldap3 library. This is required for LDAP Authentication.'
)
self.ldap_mode = hs.config.ldap_mode
self.ldap_uri = hs.config.ldap_uri
self.ldap_start_tls = hs.config.ldap_start_tls
self.ldap_base = hs.config.ldap_base
self.ldap_attributes = hs.config.ldap_attributes
if self.ldap_mode == LDAPMode.SEARCH:
self.ldap_bind_dn = hs.config.ldap_bind_dn
self.ldap_bind_password = hs.config.ldap_bind_password
self.ldap_filter = hs.config.ldap_filter
account_handler = _AccountHandler(
hs, check_user_exists=self.check_user_exists
)
self.password_providers = [
module(config=config, account_handler=account_handler)
for module, config in hs.config.password_providers
]
self.hs = hs # FIXME better possibility to access registrationHandler later?
self.device_handler = hs.get_device_handler()
@ -497,9 +482,10 @@ class AuthHandler(BaseHandler):
Raises:
LoginError if login fails
"""
valid_ldap = yield self._check_ldap_password(user_id, password)
if valid_ldap:
defer.returnValue(user_id)
for provider in self.password_providers:
is_valid = yield provider.check_password(user_id, password)
if is_valid:
defer.returnValue(user_id)
canonical_user_id = yield self._check_local_password(user_id, password)
@ -536,275 +522,6 @@ class AuthHandler(BaseHandler):
defer.returnValue(None)
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
and register an account if none exists.
Returns:
True if authentication against LDAP was successful
"""
if not ldap3 or not self.ldap_enabled:
defer.returnValue(False)
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.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
registration_handler = self.hs.get_handlers().registration_handler
user_id, access_token = (
yield registration_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)
@defer.inlineCallbacks
def issue_access_token(self, user_id, device_id=None):
access_token = self.generate_access_token(user_id)
@ -942,3 +659,30 @@ class AuthHandler(BaseHandler):
stored_hash.encode('utf-8')) == stored_hash
else:
return False
class _AccountHandler(object):
"""A proxy object that gets passed to password auth providers so they
can register new users etc if necessary.
"""
def __init__(self, hs, check_user_exists):
self.hs = hs
self._check_user_exists = check_user_exists
def check_user_exists(self, user_id):
"""Check if user exissts.
Returns:
Deferred(bool)
"""
return self._check_user_exists(user_id)
def register(self, localpart):
"""Registers a new user with given localpart
Returns:
Deferred: a 2-tuple of (user_id, access_token)
"""
reg = self.hs.get_handlers().registration_handler
return reg.register(localpart=localpart)