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Fix problem reading macaroon_secret_key from config (#4373)

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* Fix fallback to signing key for macaroon-secret-key

* Skip macaroon check for access tokens in the db

* Fix macaroon_secret_key fallback logic

* changelog
This commit is contained in:
Richard van der Hoff 2019-01-10 14:21:50 +00:00 committed by Amber Brown
parent ad1c68ad94
commit db1eb7e3e6
4 changed files with 35 additions and 198 deletions
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1
changelog.d/4373.bugfix Normal file
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@ -0,0 +1 @@
Fix problem reading macaroon_secret_key from config

67
synapse/api/auth.py
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@ -300,20 +300,28 @@ class Auth(object):
Raises:
AuthError if no user by that token exists or the token is invalid.
"""
if rights == "access":
# first look in the database
r = yield self._look_up_user_by_access_token(token)
if r:
defer.returnValue(r)
# otherwise it needs to be a valid macaroon
try:
user_id, guest = self._parse_and_validate_macaroon(token, rights)
except _InvalidMacaroonException:
# doesn't look like a macaroon: treat it as an opaque token which
# must be in the database.
# TODO: it would be nice to get rid of this, but apparently some
# people use access tokens which aren't macaroons
r = yield self._look_up_user_by_access_token(token)
defer.returnValue(r)
try:
user = UserID.from_string(user_id)
if guest:
if rights == "access":
if not guest:
# non-guest access tokens must be in the database
logger.warning("Unrecognised access token - not in store.")
raise AuthError(
self.TOKEN_NOT_FOUND_HTTP_STATUS,
"Unrecognised access token.",
errcode=Codes.UNKNOWN_TOKEN,
)
# Guest access tokens are not stored in the database (there can
# only be one access token per guest, anyway).
#
@ -354,31 +362,15 @@ class Auth(object):
"device_id": None,
}
else:
# This codepath exists for several reasons:
# * so that we can actually return a token ID, which is used
# in some parts of the schema (where we probably ought to
# use device IDs instead)
# * the only way we currently have to invalidate an
# access_token is by removing it from the database, so we
# have to check here that it is still in the db
# * some attributes (notably device_id) aren't stored in the
# macaroon. They probably should be.
# TODO: build the dictionary from the macaroon once the
# above are fixed
ret = yield self._look_up_user_by_access_token(token)
if ret["user"] != user:
logger.error(
"Macaroon user (%s) != DB user (%s)",
user,
ret["user"]
)
raise AuthError(
self.TOKEN_NOT_FOUND_HTTP_STATUS,
"User mismatch in macaroon",
errcode=Codes.UNKNOWN_TOKEN
)
raise RuntimeError("Unknown rights setting %s", rights)
defer.returnValue(ret)
except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError):
except (
_InvalidMacaroonException,
pymacaroons.exceptions.MacaroonException,
TypeError,
ValueError,
) as e:
logger.warning("Invalid macaroon in auth: %s %s", type(e), e)
raise AuthError(
self.TOKEN_NOT_FOUND_HTTP_STATUS, "Invalid macaroon passed.",
errcode=Codes.UNKNOWN_TOKEN
@ -508,11 +500,8 @@ class Auth(object):
def _look_up_user_by_access_token(self, token):
ret = yield self.store.get_user_by_access_token(token)
if not ret:
logger.warn("Unrecognised access token - not in store.")
raise AuthError(
self.TOKEN_NOT_FOUND_HTTP_STATUS, "Unrecognised access token.",
errcode=Codes.UNKNOWN_TOKEN
)
defer.returnValue(None)
# we use ret.get() below because *lots* of unit tests stub out
# get_user_by_access_token in a way where it only returns a couple of
# the fields.

10
synapse/config/key.py
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@ -57,8 +57,8 @@ class KeyConfig(Config):
# Unfortunately, there are people out there that don't have this
# set. Lets just be "nice" and derive one from their secret key.
logger.warn("Config is missing missing macaroon_secret_key")
seed = self.signing_key[0].seed
self.macaroon_secret_key = hashlib.sha256(seed)
seed = bytes(self.signing_key[0])
self.macaroon_secret_key = hashlib.sha256(seed).digest()
self.expire_access_token = config.get("expire_access_token", False)
@ -71,14 +71,14 @@ class KeyConfig(Config):
base_key_name = os.path.join(config_dir_path, server_name)
if is_generating_file:
macaroon_secret_key = random_string_with_symbols(50)
macaroon_secret_key = '"%s"' % random_string_with_symbols(50)
form_secret = '"%s"' % random_string_with_symbols(50)
else:
macaroon_secret_key = None
macaroon_secret_key = 'null'
form_secret = 'null'
return """\
macaroon_secret_key: "%(macaroon_secret_key)s"
macaroon_secret_key: %(macaroon_secret_key)s
# Used to enable access token expiration.
expire_access_token: False

155
tests/api/test_auth.py
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@ -192,8 +192,6 @@ class AuthTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_get_user_from_macaroon(self):
# TODO(danielwh): Remove this mock when we remove the
# get_user_by_access_token fallback.
self.store.get_user_by_access_token = Mock(
return_value={"name": "@baldrick:matrix.org", "device_id": "device"}
)
@ -218,6 +216,7 @@ class AuthTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_get_guest_user_from_macaroon(self):
self.store.get_user_by_id = Mock(return_value={"is_guest": True})
self.store.get_user_by_access_token = Mock(return_value=None)
user_id = "@baldrick:matrix.org"
macaroon = pymacaroons.Macaroon(
@ -238,158 +237,6 @@ class AuthTestCase(unittest.TestCase):
self.assertTrue(is_guest)
self.store.get_user_by_id.assert_called_with(user_id)
@defer.inlineCallbacks
def test_get_user_from_macaroon_user_db_mismatch(self):
self.store.get_user_by_access_token = Mock(
return_value={"name": "@percy:matrix.org"}
)
user = "@baldrick:matrix.org"
macaroon = pymacaroons.Macaroon(
location=self.hs.config.server_name,
identifier="key",
key=self.hs.config.macaroon_secret_key,
)
macaroon.add_first_party_caveat("gen = 1")
macaroon.add_first_party_caveat("type = access")
macaroon.add_first_party_caveat("user_id = %s" % (user,))
with self.assertRaises(AuthError) as cm:
yield self.auth.get_user_by_access_token(macaroon.serialize())
self.assertEqual(401, cm.exception.code)
self.assertIn("User mismatch", cm.exception.msg)
@defer.inlineCallbacks
def test_get_user_from_macaroon_missing_caveat(self):
# TODO(danielwh): Remove this mock when we remove the
# get_user_by_access_token fallback.
self.store.get_user_by_access_token = Mock(
return_value={"name": "@baldrick:matrix.org"}
)
macaroon = pymacaroons.Macaroon(
location=self.hs.config.server_name,
identifier="key",
key=self.hs.config.macaroon_secret_key,
)
macaroon.add_first_party_caveat("gen = 1")
macaroon.add_first_party_caveat("type = access")
with self.assertRaises(AuthError) as cm:
yield self.auth.get_user_by_access_token(macaroon.serialize())
self.assertEqual(401, cm.exception.code)
self.assertIn("No user caveat", cm.exception.msg)
@defer.inlineCallbacks
def test_get_user_from_macaroon_wrong_key(self):
# TODO(danielwh): Remove this mock when we remove the
# get_user_by_access_token fallback.
self.store.get_user_by_access_token = Mock(
return_value={"name": "@baldrick:matrix.org"}
)
user = "@baldrick:matrix.org"
macaroon = pymacaroons.Macaroon(
location=self.hs.config.server_name,
identifier="key",
key=self.hs.config.macaroon_secret_key + "wrong",
)
macaroon.add_first_party_caveat("gen = 1")
macaroon.add_first_party_caveat("type = access")
macaroon.add_first_party_caveat("user_id = %s" % (user,))
with self.assertRaises(AuthError) as cm:
yield self.auth.get_user_by_access_token(macaroon.serialize())
self.assertEqual(401, cm.exception.code)
self.assertIn("Invalid macaroon", cm.exception.msg)
@defer.inlineCallbacks
def test_get_user_from_macaroon_unknown_caveat(self):
# TODO(danielwh): Remove this mock when we remove the
# get_user_by_access_token fallback.
self.store.get_user_by_access_token = Mock(
return_value={"name": "@baldrick:matrix.org"}
)
user = "@baldrick:matrix.org"
macaroon = pymacaroons.Macaroon(
location=self.hs.config.server_name,
identifier="key",
key=self.hs.config.macaroon_secret_key,
)
macaroon.add_first_party_caveat("gen = 1")
macaroon.add_first_party_caveat("type = access")
macaroon.add_first_party_caveat("user_id = %s" % (user,))
macaroon.add_first_party_caveat("cunning > fox")
with self.assertRaises(AuthError) as cm:
yield self.auth.get_user_by_access_token(macaroon.serialize())
self.assertEqual(401, cm.exception.code)
self.assertIn("Invalid macaroon", cm.exception.msg)
@defer.inlineCallbacks
def test_get_user_from_macaroon_expired(self):
# TODO(danielwh): Remove this mock when we remove the
# get_user_by_access_token fallback.
self.store.get_user_by_access_token = Mock(
return_value={"name": "@baldrick:matrix.org"}
)
self.store.get_user_by_access_token = Mock(
return_value={"name": "@baldrick:matrix.org"}
)
user = "@baldrick:matrix.org"
macaroon = pymacaroons.Macaroon(
location=self.hs.config.server_name,
identifier="key",
key=self.hs.config.macaroon_secret_key,
)
macaroon.add_first_party_caveat("gen = 1")
macaroon.add_first_party_caveat("type = access")
macaroon.add_first_party_caveat("user_id = %s" % (user,))
macaroon.add_first_party_caveat("time < -2000") # ms
self.hs.clock.now = 5000 # seconds
self.hs.config.expire_access_token = True
# yield self.auth.get_user_by_access_token(macaroon.serialize())
# TODO(daniel): Turn on the check that we validate expiration, when we
# validate expiration (and remove the above line, which will start
# throwing).
with self.assertRaises(AuthError) as cm:
yield self.auth.get_user_by_access_token(macaroon.serialize())
self.assertEqual(401, cm.exception.code)
self.assertIn("Invalid macaroon", cm.exception.msg)
@defer.inlineCallbacks
def test_get_user_from_macaroon_with_valid_duration(self):
# TODO(danielwh): Remove this mock when we remove the
# get_user_by_access_token fallback.
self.store.get_user_by_access_token = Mock(
return_value={"name": "@baldrick:matrix.org"}
)
self.store.get_user_by_access_token = Mock(
return_value={"name": "@baldrick:matrix.org"}
)
user_id = "@baldrick:matrix.org"
macaroon = pymacaroons.Macaroon(
location=self.hs.config.server_name,
identifier="key",
key=self.hs.config.macaroon_secret_key,
)
macaroon.add_first_party_caveat("gen = 1")
macaroon.add_first_party_caveat("type = access")
macaroon.add_first_party_caveat("user_id = %s" % (user_id,))
macaroon.add_first_party_caveat("time < 900000000") # ms
self.hs.clock.now = 5000 # seconds
self.hs.config.expire_access_token = True
user_info = yield self.auth.get_user_by_access_token(macaroon.serialize())
user = user_info["user"]
self.assertEqual(UserID.from_string(user_id), user)
@defer.inlineCallbacks
def test_cannot_use_regular_token_as_guest(self):
USER_ID = "@percy:matrix.org"