Fix login with m.login.token

login with token (as used by CAS auth) was broken by 067596d, such that it
always returned a 401.
This commit is contained in:
Richard van der Hoff 2016-08-08 16:34:07 +01:00
parent e7674eb759
commit 6fe6a6f029
4 changed files with 87 additions and 32 deletions

View File

@ -675,27 +675,18 @@ class Auth(object):
try:
macaroon = pymacaroons.Macaroon.deserialize(macaroon_str)
user_prefix = "user_id = "
user = None
user_id = None
guest = False
for caveat in macaroon.caveats:
if caveat.caveat_id.startswith(user_prefix):
user_id = caveat.caveat_id[len(user_prefix):]
user = UserID.from_string(user_id)
elif caveat.caveat_id == "guest = true":
guest = True
user_id = self.get_user_id_from_macaroon(macaroon)
user = UserID.from_string(user_id)
self.validate_macaroon(
macaroon, rights, self.hs.config.expire_access_token,
user_id=user_id,
)
if user is None:
raise AuthError(
self.TOKEN_NOT_FOUND_HTTP_STATUS, "No user caveat in macaroon",
errcode=Codes.UNKNOWN_TOKEN
)
guest = False
for caveat in macaroon.caveats:
if caveat.caveat_id == "guest = true":
guest = True
if guest:
ret = {
@ -743,6 +734,29 @@ class Auth(object):
errcode=Codes.UNKNOWN_TOKEN
)
def get_user_id_from_macaroon(self, macaroon):
"""Retrieve the user_id given by the caveats on the macaroon.
Does *not* validate the macaroon.
Args:
macaroon (pymacaroons.Macaroon): The macaroon to validate
Returns:
(str) user id
Raises:
AuthError if there is no user_id caveat in the macaroon
"""
user_prefix = "user_id = "
for caveat in macaroon.caveats:
if caveat.caveat_id.startswith(user_prefix):
return caveat.caveat_id[len(user_prefix):]
raise AuthError(
self.TOKEN_NOT_FOUND_HTTP_STATUS, "No user caveat in macaroon",
errcode=Codes.UNKNOWN_TOKEN
)
def validate_macaroon(self, macaroon, type_string, verify_expiry, user_id):
"""
validate that a Macaroon is understood by and was signed by this server.
@ -754,6 +768,7 @@ class Auth(object):
verify_expiry(bool): Whether to verify whether the macaroon has expired.
This should really always be True, but no clients currently implement
token refresh, so we can't enforce expiry yet.
user_id (str): The user_id required
"""
v = pymacaroons.Verifier()
v.satisfy_exact("gen = 1")

View File

@ -720,10 +720,11 @@ class AuthHandler(BaseHandler):
def validate_short_term_login_token_and_get_user_id(self, login_token):
try:
macaroon = pymacaroons.Macaroon.deserialize(login_token)
auth_api = self.hs.get_auth()
auth_api.validate_macaroon(macaroon, "login", True)
return self.get_user_from_macaroon(macaroon)
macaroon = pymacaroons.Macaroon.deserialize(login_token)
user_id = auth_api.get_user_id_from_macaroon(macaroon)
auth_api.validate_macaroon(macaroon, "login", True, user_id)
return user_id
except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError):
raise AuthError(401, "Invalid token", errcode=Codes.UNKNOWN_TOKEN)
@ -736,16 +737,6 @@ class AuthHandler(BaseHandler):
macaroon.add_first_party_caveat("user_id = %s" % (user_id,))
return macaroon
def get_user_from_macaroon(self, macaroon):
user_prefix = "user_id = "
for caveat in macaroon.caveats:
if caveat.caveat_id.startswith(user_prefix):
return caveat.caveat_id[len(user_prefix):]
raise AuthError(
self.INVALID_TOKEN_HTTP_STATUS, "No user_id found in token",
errcode=Codes.UNKNOWN_TOKEN
)
@defer.inlineCallbacks
def set_password(self, user_id, newpassword, requester=None):
password_hash = self.hash(newpassword)

View File

@ -1,3 +1,4 @@
import synapse.api.auth
import synapse.handlers
import synapse.handlers.auth
import synapse.handlers.device
@ -6,6 +7,9 @@ import synapse.storage
import synapse.state
class HomeServer(object):
def get_auth(self) -> synapse.api.auth.Auth:
pass
def get_auth_handler(self) -> synapse.handlers.auth.AuthHandler:
pass

View File

@ -14,12 +14,13 @@
# limitations under the License.
import pymacaroons
from twisted.internet import defer
import synapse
import synapse.api.errors
from synapse.handlers.auth import AuthHandler
from tests import unittest
from tests.utils import setup_test_homeserver
from twisted.internet import defer
class AuthHandlers(object):
def __init__(self, hs):
@ -31,11 +32,12 @@ class AuthTestCase(unittest.TestCase):
def setUp(self):
self.hs = yield setup_test_homeserver(handlers=None)
self.hs.handlers = AuthHandlers(self.hs)
self.auth_handler = self.hs.handlers.auth_handler
def test_token_is_a_macaroon(self):
self.hs.config.macaroon_secret_key = "this key is a huge secret"
token = self.hs.handlers.auth_handler.generate_access_token("some_user")
token = self.auth_handler.generate_access_token("some_user")
# Check that we can parse the thing with pymacaroons
macaroon = pymacaroons.Macaroon.deserialize(token)
# The most basic of sanity checks
@ -46,7 +48,7 @@ class AuthTestCase(unittest.TestCase):
self.hs.config.macaroon_secret_key = "this key is a massive secret"
self.hs.clock.now = 5000
token = self.hs.handlers.auth_handler.generate_access_token("a_user")
token = self.auth_handler.generate_access_token("a_user")
macaroon = pymacaroons.Macaroon.deserialize(token)
def verify_gen(caveat):
@ -67,3 +69,46 @@ class AuthTestCase(unittest.TestCase):
v.satisfy_general(verify_type)
v.satisfy_general(verify_expiry)
v.verify(macaroon, self.hs.config.macaroon_secret_key)
def test_short_term_login_token_gives_user_id(self):
self.hs.clock.now = 1000
token = self.auth_handler.generate_short_term_login_token(
"a_user", 5000
)
self.assertEqual(
"a_user",
self.auth_handler.validate_short_term_login_token_and_get_user_id(
token
)
)
# when we advance the clock, the token should be rejected
self.hs.clock.now = 6000
with self.assertRaises(synapse.api.errors.AuthError):
self.auth_handler.validate_short_term_login_token_and_get_user_id(
token
)
def test_short_term_login_token_cannot_replace_user_id(self):
token = self.auth_handler.generate_short_term_login_token(
"a_user", 5000
)
macaroon = pymacaroons.Macaroon.deserialize(token)
self.assertEqual(
"a_user",
self.auth_handler.validate_short_term_login_token_and_get_user_id(
macaroon.serialize()
)
)
# add another "user_id" caveat, which might allow us to override the
# user_id.
macaroon.add_first_party_caveat("user_id = b_user")
with self.assertRaises(synapse.api.errors.AuthError):
self.auth_handler.validate_short_term_login_token_and_get_user_id(
macaroon.serialize()
)