diff options
| -rw-r--r-- | synapse/api/auth.py | 45 | ||||
| -rw-r--r-- | synapse/handlers/auth.py | 17 | ||||
| -rw-r--r-- | synapse/server.pyi | 4 | ||||
| -rw-r--r-- | tests/handlers/test_auth.py | 52 |
4 files changed, 87 insertions, 31 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py index 59db76debc..0db26fcfd7 100644 --- a/synapse/api/auth.py +++ b/synapse/api/auth.py @@ -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") diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py index 2e138f328f..1d3641b7a7 100644 --- a/synapse/handlers/auth.py +++ b/synapse/handlers/auth.py @@ -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) diff --git a/synapse/server.pyi b/synapse/server.pyi index c0aa868c4f..9570df5537 100644 --- a/synapse/server.pyi +++ b/synapse/server.pyi @@ -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 diff --git a/tests/handlers/test_auth.py b/tests/handlers/test_auth.py index 21077cbe9a..4a8cd19acf 100644 --- a/tests/handlers/test_auth.py +++ b/tests/handlers/test_auth.py @@ -14,11 +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): @@ -31,11 +33,12 @@ 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 +49,7 @@ 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 +70,46 @@ 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() + ) |