def _write_discharge_error(self, exc):
version = httpbakery.request_version(self.headers)
if version < bakery.LATEST_VERSION:
self._server_version = version
caveats = []
if self._auth_location != '':
caveats = [
checkers.Caveat(location=self._auth_location,
condition='is-ok')
]
if self._caveats is not None:
caveats.extend(self._caveats)
m = self._bakery.oven.macaroon(version=bakery.LATEST_VERSION,
expiry=self._expiry,
caveats=caveats,
ops=[TEST_OP])
content, headers = httpbakery.discharge_required_response(
m, '/', 'test', exc.args[0])
self.send_response(401)
for h in headers:
self.send_header(h, headers[h])
self.send_header('Connection', 'close')
self.end_headers()
self.wfile.write(content)
def server_get(url, request):
ctx = checkers.AuthContext()
test_ops = [bakery.Op(entity='test-op', action='read')]
auth_checker = server_bakery.checker.auth(
httpbakery.extract_macaroons(request.headers))
try:
auth_checker.allow(ctx, test_ops)
resp = response(status_code=200, content='done')
except bakery.PermissionDenied:
caveats = [
checkers.Caveat(location='http://0.3.2.1',
condition='is-ok')
]
m = server_bakery.oven.macaroon(version=bakery.LATEST_VERSION,
expiry=datetime.utcnow() +
timedelta(days=1),
caveats=caveats,
ops=test_ops)
content, headers = httpbakery.discharge_required_response(
m, '/', 'test', 'message')
resp = response(
status_code=401,
content=content,
headers=headers,
)
return request.hooks['response'][0](resp)
def test_discharge_with_version1_macaroon(self):
locator = bakery.ThirdPartyStore()
bs = common.new_bakery('bs-loc', locator)
ts = common.new_bakery('ts-loc', locator)
# ts creates a old-version macaroon.
ts_macaroon = ts.oven.macaroon(bakery.VERSION_1, common.ages, None,
[bakery.LOGIN_OP])
ts_macaroon.add_caveat(
checkers.Caveat(condition='something', location='bs-loc'),
ts.oven.key, ts.oven.locator)
# client asks for a discharge macaroon for each third party caveat
def get_discharge(cav, payload):
# Make sure that the caveat id really is old-style.
try:
cav.caveat_id_bytes.decode('utf-8')
except UnicodeDecodeError:
self.fail('caveat id is not utf-8')
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
bs.oven.key,
common.ThirdPartyStrcmpChecker('something'),
bs.oven.locator,
)
d = bakery.discharge_all(ts_macaroon, get_discharge)
ts.checker.auth([d]).allow(common.test_context, [bakery.LOGIN_OP])
for m in d:
self.assertEqual(m.version, MACAROON_V1)
def test_operations_checker(self):
tests = [
('all allowed', checkers.allow_caveat(['op1', 'op2', 'op4', 'op3'
]), ['op1', 'op3',
'op2'], None),
('none denied', checkers.deny_caveat(['op1',
'op2']), ['op3',
'op4'], None),
('one not allowed', checkers.allow_caveat(['op1',
'op2']), ['op1', 'op3'],
'caveat "allow op1 op2" not satisfied: op3 not allowed'),
('one not denied', checkers.deny_caveat(['op1', 'op2']),
['op4', 'op5',
'op2'], 'caveat "deny op1 op2" not satisfied: op2 not allowed'),
('no operations, allow caveat', checkers.allow_caveat(['op1']), [],
'caveat "allow op1" not satisfied: op1 not allowed'),
('no operations, deny caveat', checkers.deny_caveat(['op1']), [],
None),
('no operations, empty allow caveat',
checkers.Caveat(condition=checkers.COND_ALLOW), [],
'caveat "allow" not satisfied: no operations allowed'),
]
checker = checkers.Checker()
for test in tests:
print(test[0])
ctx = checkers.context_with_operations(checkers.AuthContext(),
test[2])
err = checker.check_first_party_caveat(ctx, test[1].condition)
if test[3] is None:
self.assertIsNone(err)
continue
self.assertEqual(err, test[3])
def test_macaroon_paper_fig6_fails_without_discharges(self):
''' Runs a similar test as test_macaroon_paper_fig6 without the client
discharging the third party caveats.
'''
locator = bakery.ThirdPartyStore()
ts = common.new_bakery('ts-loc', locator)
fs = common.new_bakery('fs-loc', locator)
common.new_bakery('as-loc', locator)
# ts creates a macaroon.
ts_macaroon = ts.oven.macaroon(bakery.LATEST_VERSION, common.ages,
None, [bakery.LOGIN_OP])
# ts somehow sends the macaroon to fs which adds a third party
# caveat to be discharged by as.
ts_macaroon.add_caveat(
checkers.Caveat(location='as-loc', condition='user==bob'),
fs.oven.key, fs.oven.locator)
# client makes request to ts
try:
ts.checker.auth([[ts_macaroon.macaroon]
]).allow(common.test_context, bakery.LOGIN_OP)
self.fail('macaroon unmet should be raised')
except bakery.PermissionDenied:
pass
def test_marshal_json_latest_version(self):
locator = bakery.ThirdPartyStore()
bs = common.new_bakery('bs-loc', locator)
ns = checkers.Namespace({
'testns': 'x',
'otherns': 'y',
})
m = bakery.Macaroon(
root_key=b'root key', id=b'id',
location='location',
version=bakery.LATEST_VERSION,
namespace=ns)
m.add_caveat(checkers.Caveat(location='bs-loc', condition='something'),
bs.oven.key, locator)
data = m.serialize_json()
m1 = bakery.Macaroon.deserialize_json(data)
# Just check the signature and version - we're not interested in fully
# checking the macaroon marshaling here.
self.assertEqual(m1.macaroon.signature, m.macaroon.signature)
self.assertEqual(m1.macaroon.version, m.macaroon.version)
self.assertEqual(len(m1.macaroon.caveats), 1)
self.assertEqual(m1.namespace, m.namespace)
self.assertEqual(m1._caveat_data, m._caveat_data)
# test with the encoder, decoder
data = json.dumps(m, cls=bakery.MacaroonJSONEncoder)
m1 = json.loads(data, cls=bakery.MacaroonJSONDecoder)
self.assertEqual(m1.macaroon.signature, m.macaroon.signature)
self.assertEqual(m1.macaroon.version, m.macaroon.version)
self.assertEqual(len(m1.macaroon.caveats), 1)
self.assertEqual(m1.namespace, m.namespace)
self.assertEqual(m1._caveat_data, m._caveat_data)
def test_add_third_party_caveat(self):
locator = bakery.ThirdPartyStore()
bs = common.new_bakery('bs-loc', locator)
lbv = six.int2byte(bakery.LATEST_VERSION)
tests = [
('no existing id', b'', [], lbv + six.int2byte(0)),
('several existing ids', b'', [
lbv + six.int2byte(0),
lbv + six.int2byte(1),
lbv + six.int2byte(2)
], lbv + six.int2byte(3)),
('with base id', lbv + six.int2byte(0), [lbv + six.int2byte(0)],
lbv + six.int2byte(0) + six.int2byte(0)),
('with base id and existing id', lbv + six.int2byte(0), [
lbv + six.int2byte(0) + six.int2byte(0)
], lbv + six.int2byte(0) + six.int2byte(1))
]
for test in tests:
print('test ', test[0])
m = bakery.Macaroon(
root_key=b'root key', id=b'id',
location='location',
version=bakery.LATEST_VERSION)
for id in test[2]:
m.macaroon.add_third_party_caveat(key=None, key_id=id,
location='')
m._caveat_id_prefix = test[1]
m.add_caveat(checkers.Caveat(location='bs-loc',
condition='something'),
bs.oven.key, locator)
self.assertEqual(m.macaroon.caveats[len(test[2])].caveat_id,
test[3])
def test_add_first_party_caveat(self):
m = bakery.Macaroon('rootkey', 'some id', 'here',
bakery.LATEST_VERSION)
m.add_caveat(checkers.Caveat('test_condition'))
caveats = m.first_party_caveats()
self.assertEquals(len(caveats), 1)
self.assertEquals(caveats[0].caveat_id, b'test_condition')
def f(ctx, identity, op):
self.assertEqual(identity.id(), 'bob')
if op.entity == 'a':
return False, None
elif op.entity == 'b':
return True, None
elif op.entity == 'c':
return True, [
checkers.Caveat(location='somewhere', condition='c')
]
elif op.entity == 'd':
return True, [
checkers.Caveat(location='somewhere', condition='d')
]
else:
self.fail('unexpected entity: ' + op.Entity)
def _test_json_with_version(self, version):
locator = bakery.ThirdPartyStore()
bs = common.new_bakery('bs-loc', locator)
ns = checkers.Namespace({
'testns': 'x',
})
m = bakery.Macaroon(
root_key=b'root key', id=b'id',
location='location', version=version,
namespace=ns)
m.add_caveat(checkers.Caveat(location='bs-loc', condition='something'),
bs.oven.key, locator)
# Sanity check that no external caveat data has been added.
self.assertEqual(len(m._caveat_data), 0)
data = json.dumps(m, cls=bakery.MacaroonJSONEncoder)
m1 = json.loads(data, cls=bakery.MacaroonJSONDecoder)
# Just check the signature and version - we're not interested in fully
# checking the macaroon marshaling here.
self.assertEqual(m1.macaroon.signature, m.macaroon.signature)
self.assertEqual(m1.macaroon.version,
bakery.macaroon_version(version))
self.assertEqual(len(m1.macaroon.caveats), 1)
# Namespace information has been thrown away.
self.assertEqual(m1.namespace, bakery.legacy_namespace())
self.assertEqual(len(m1._caveat_data), 0)
def authorize_with_tp_discharge(ctx, id, op):
if (id is not None and id.id() == 'bob'
and op == bakery.Op(entity='something', action='read')):
return True, [
checkers.Caveat(condition='question',
location='other third party')
]
return False, None
def check_third_party_caveat(self, ctx, info):
if self._loc == 'as1-loc':
return [checkers.Caveat(condition='something',
location='as2-loc')]
if self._loc == 'as2-loc':
return []
raise common.ThirdPartyCaveatCheckFailed(
'unknown location {}'.format(self._loc))
def add_caveat(self, cav, key=None, loc=None):
'''Add a caveat to the macaroon.
It encrypts it using the given key pair
and by looking up the location using the given locator.
As a special case, if the caveat's Location field has the prefix
"local " the caveat is added as a client self-discharge caveat using
the public key base64-encoded in the rest of the location. In this
case, the Condition field must be empty. The resulting third-party
caveat will encode the condition "true" encrypted with that public
key.
@param cav the checkers.Caveat to be added.
@param key the public key to encrypt third party caveat.
@param loc locator to find information on third parties when adding
third party caveats. It is expected to have a third_party_info method
that will be called with a location string and should return a
ThirdPartyInfo instance holding the requested information.
'''
if cav.location is None:
self._macaroon.add_first_party_caveat(
self.namespace.resolve_caveat(cav).condition)
return
if key is None:
raise ValueError('no private key to encrypt third party caveat')
local_info = _parse_local_location(cav.location)
if local_info is not None:
if cav.condition:
raise ValueError('cannot specify caveat condition in '
'local third-party caveat')
info = local_info
cav = checkers.Caveat(location='local', condition='true')
else:
if loc is None:
raise ValueError('no locator when adding third party caveat')
info = loc.third_party_info(cav.location)
root_key = os.urandom(24)
# Use the least supported version to encode the caveat.
if self._version < info.version:
info = ThirdPartyInfo(
version=self._version,
public_key=info.public_key,
)
caveat_info = encode_caveat(cav.condition, root_key, info, key,
self._namespace)
if info.version < VERSION_3:
# We're encoding for an earlier client or third party which does
# not understand bundled caveat info, so use the encoded
# caveat information as the caveat id.
id = caveat_info
else:
id = self._new_caveat_id(self._caveat_id_prefix)
self._caveat_data[id] = caveat_info
self._macaroon.add_third_party_caveat(cav.location, root_key, id)
def _identity_caveats():
"""Caveats required for user authentication using Candid."""
return [
checkers.need_declared_caveat(
checkers.Caveat(location='https://api.staging.jujucharms.com/identity',
condition='is-authenticated-user'),
['username']
)
]
def local_third_party_caveat(key, version):
''' Returns a third-party caveat that, when added to a macaroon with
add_caveat, results in a caveat with the location "local", encrypted with
the given PublicKey.
This can be automatically discharged by discharge_all passing a local key.
'''
if version >= VERSION_2:
loc = 'local {} {}'.format(version, key)
else:
loc = 'local {}'.format(key)
return checkers.Caveat(location=loc, condition='')
def local_third_party_caveat(key, version):
''' Returns a third-party caveat that, when added to a macaroon with
add_caveat, results in a caveat with the location "local", encrypted with
the given PublicKey.
This can be automatically discharged by discharge_all passing a local key.
'''
encoded_key = key.encode().decode('utf-8')
loc = 'local {}'.format(encoded_key)
if version >= macaroonbakery.BAKERY_V2:
loc = 'local {} {}'.format(version, encoded_key)
return checkers.Caveat(location=loc, condition='')
def checker(_, ci):
caveats = []
if ci.condition != 'something':
self.fail('unexpected condition')
for i in range(0, 2):
if M.still_required <= 0:
break
caveats.append(checkers.Caveat(location=add_bakery(),
condition='something'))
M.still_required -= 1
return caveats
def test_clone(self):
locator = bakery.ThirdPartyStore()
bs = common.new_bakery("bs-loc", locator)
ns = checkers.Namespace({
"testns": "x",
})
m = bakery.Macaroon(root_key=b'root key',
id=b'id',
location='location',
version=bakery.LATEST_VERSION,
namespace=ns)
m.add_caveat(checkers.Caveat(location='bs-loc', condition='something'),
bs.oven.key, locator)
m1 = m.copy()
self.assertEqual(len(m.macaroon.caveats), 1)
self.assertEqual(len(m1.macaroon.caveats), 1)
self.assertEqual(m._caveat_data, m1._caveat_data)
m.add_caveat(checkers.Caveat(location='bs-loc', condition='something'),
bs.oven.key, locator)
self.assertEqual(len(m.macaroon.caveats), 2)
self.assertEqual(len(m1.macaroon.caveats), 1)
self.assertNotEqual(m._caveat_data, m1._caveat_data)
def test_third_party_discharge_macaroon_ids_are_small(self):
locator = bakery.ThirdPartyStore()
bakeries = {
'ts-loc': common.new_bakery('ts-loc', locator),
'as1-loc': common.new_bakery('as1-loc', locator),
'as2-loc': common.new_bakery('as2-loc', locator),
}
ts = bakeries['ts-loc']
ts_macaroon = ts.oven.macaroon(bakery.LATEST_VERSION,
common.ages,
None, [bakery.LOGIN_OP])
ts_macaroon.add_caveat(checkers.Caveat(condition='something',
location='as1-loc'),
ts.oven.key, ts.oven.locator)
class ThirdPartyCaveatCheckerF(bakery.ThirdPartyCaveatChecker):
def __init__(self, loc):
self._loc = loc
def check_third_party_caveat(self, ctx, info):
if self._loc == 'as1-loc':
return [checkers.Caveat(condition='something',
location='as2-loc')]
if self._loc == 'as2-loc':
return []
raise common.ThirdPartyCaveatCheckFailed(
'unknown location {}'.format(self._loc))
def get_discharge(cav, payload):
oven = bakeries[cav.location].oven
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
oven.key,
ThirdPartyCaveatCheckerF(cav.location),
oven.locator,
)
d = bakery.discharge_all(ts_macaroon, get_discharge)
ts.checker.auth([d]).allow(common.test_context,
[bakery.LOGIN_OP])
for i, m in enumerate(d):
for j, cav in enumerate(m.caveats):
if (cav.verification_key_id is not None and
len(cav.caveat_id) > 3):
self.fail('caveat id on caveat {} of macaroon {} '
'is too big ({})'.format(j, i, cav.id))
def test_single_service_first_party(self):
''' Creates a single service with a macaroon with one first party
caveat.
It creates a request with this macaroon and checks that the service
can verify this macaroon as valid.
'''
oc = common.new_bakery('bakerytest')
primary = oc.oven.macaroon(bakery.LATEST_VERSION,
common.ages, None,
[bakery.LOGIN_OP])
self.assertEqual(primary.macaroon.location, 'bakerytest')
primary.add_caveat(checkers.Caveat(condition='str something',
namespace='testns'),
oc.oven.key, oc.oven.locator)
oc.checker.auth([[primary.macaroon]]).allow(
common.str_context('something'), [bakery.LOGIN_OP])
def test_macaroon_paper_fig6(self):
''' Implements an example flow as described in the macaroons paper:
http://theory.stanford.edu/~ataly/Papers/macaroons.pdf
There are three services, ts, fs, bs:
ts is a store service which has deligated authority to a forum
service fs.
The forum service wants to require its users to be logged into to an
authentication service bs.
The client obtains a macaroon from fs (minted by ts, with a third party
caveat addressed to bs).
The client obtains a discharge macaroon from bs to satisfy this caveat.
The target service verifies the original macaroon it delegated to fs
No direct contact between bs and ts is required
'''
locator = bakery.ThirdPartyStore()
bs = common.new_bakery('bs-loc', locator)
ts = common.new_bakery('ts-loc', locator)
fs = common.new_bakery('fs-loc', locator)
# ts creates a macaroon.
ts_macaroon = ts.oven.macaroon(bakery.LATEST_VERSION,
common.ages,
None, [bakery.LOGIN_OP])
# ts somehow sends the macaroon to fs which adds a third party caveat
# to be discharged by bs.
ts_macaroon.add_caveat(checkers.Caveat(location='bs-loc',
condition='user==bob'),
fs.oven.key, fs.oven.locator)
# client asks for a discharge macaroon for each third party caveat
def get_discharge(cav, payload):
self.assertEqual(cav.location, 'bs-loc')
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
bs.oven.key,
common.ThirdPartyStrcmpChecker('user==bob'),
bs.oven.locator,
)
d = bakery.discharge_all(ts_macaroon, get_discharge)
ts.checker.auth([d]).allow(common.test_context,
[bakery.LOGIN_OP])
def test_third_party_discharge_macaroon_wrong_root_key_and_third_party_caveat(
self):
root_keys = bakery.MemoryKeyStore()
ts = bakery.Bakery(
key=bakery.generate_key(),
checker=common.test_checker(),
root_key_store=root_keys,
identity_client=common.OneIdentity(),
)
locator = bakery.ThirdPartyStore()
bs = common.new_bakery('bs-loc', locator)
# ts creates a macaroon with a third party caveat addressed to bs.
ts_macaroon = ts.oven.macaroon(bakery.LATEST_VERSION, common.ages,
None, [bakery.LOGIN_OP])
ts_macaroon.add_caveat(
checkers.Caveat(location='bs-loc', condition='true'),
ts.oven.key,
locator,
)
def get_discharge(cav, payload):
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
bs.oven.key,
common.ThirdPartyStrcmpChecker('true'),
bs.oven.locator,
)
d = bakery.discharge_all(ts_macaroon, get_discharge)
# The authorization should succeed at first.
ts.checker.auth([d]).allow(common.test_context, [bakery.LOGIN_OP])
# Corrupt the root key and try again.
# We should get a DischargeRequiredError because the verification has failed.
root_keys._key = os.urandom(24)
with self.assertRaises(bakery.PermissionDenied) as err:
ts.checker.auth([d]).allow(common.test_context, [bakery.LOGIN_OP])
self.assertEqual(
str(err.exception),
'verification failed: Decryption failed. Ciphertext failed verification'
)
def test_json_deserialize_from_go(self):
ns = checkers.Namespace()
ns.register("someuri", "x")
m = bakery.Macaroon(
root_key=b'rootkey', id=b'some id', location='here',
version=bakery.LATEST_VERSION, namespace=ns)
m.add_caveat(checkers.Caveat(condition='something',
namespace='someuri'))
data = '{"m":{"c":[{"i":"x:something"}],"l":"here","i":"some id",' \
'"s64":"c8edRIupArSrY-WZfa62pgZFD8VjDgqho9U2PlADe-E"},"v":3,' \
'"ns":"someuri:x"}'
m_go = bakery.Macaroon.deserialize_json(data)
self.assertEqual(m.macaroon.signature_bytes,
m_go.macaroon.signature_bytes)
self.assertEqual(m.macaroon.version, m_go.macaroon.version)
self.assertEqual(len(m_go.macaroon.caveats), 1)
self.assertEqual(m.namespace, m_go.namespace)
def test_macaroon_paper_fig6_fails_with_binding_on_tampered_sig(self):
''' Runs a similar test as test_macaroon_paper_fig6 with the discharge
macaroon binding being done on a tampered signature.
'''
locator = bakery.ThirdPartyStore()
bs = common.new_bakery('bs-loc', locator)
ts = common.new_bakery('ts-loc', locator)
# ts creates a macaroon.
ts_macaroon = ts.oven.macaroon(bakery.LATEST_VERSION,
common.ages, None,
[bakery.LOGIN_OP])
# ts somehow sends the macaroon to fs which adds a third party caveat
# to be discharged by as.
ts_macaroon.add_caveat(checkers.Caveat(condition='user==bob',
location='bs-loc'),
ts.oven.key, ts.oven.locator)
# client asks for a discharge macaroon for each third party caveat
def get_discharge(cav, payload):
self.assertEqual(cav.location, 'bs-loc')
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
bs.oven.key,
common.ThirdPartyStrcmpChecker('user==bob'),
bs.oven.locator,
)
d = bakery.discharge_all(ts_macaroon, get_discharge)
# client has all the discharge macaroons. For each discharge macaroon
# bind it to our ts_macaroon and add it to our request.
tampered_macaroon = Macaroon()
for i, dm in enumerate(d[1:]):
d[i + 1] = tampered_macaroon.prepare_for_request(dm)
# client makes request to ts.
with self.assertRaises(bakery.VerificationError) as exc:
ts.checker.auth([d]).allow(common.test_context,
bakery.LOGIN_OP)
self.assertEqual('verification failed: Signatures do not match',
exc.exception.args[0])
def test_discharge_macaroon_cannot_be_used_as_normal_macaroon(self):
locator = bakery.ThirdPartyStore()
first_party = common.new_bakery('first', locator)
third_party = common.new_bakery('third', locator)
# First party mints a macaroon with a 3rd party caveat.
m = first_party.oven.macaroon(bakery.LATEST_VERSION,
common.ages, [
checkers.Caveat(location='third',
condition='true')],
[bakery.LOGIN_OP])
# Acquire the discharge macaroon, but don't bind it to the original.
class M:
unbound = None
def get_discharge(cav, payload):
m = bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
third_party.oven.key,
common.ThirdPartyStrcmpChecker('true'),
third_party.oven.locator,
)
M.unbound = m.macaroon.copy()
return m
bakery.discharge_all(m, get_discharge)
self.assertIsNotNone(M.unbound)
# Make sure it cannot be used as a normal macaroon in the third party.
with self.assertRaises(bakery.VerificationError) as exc:
third_party.checker.auth([[M.unbound]]).allow(
common.test_context, [bakery.LOGIN_OP])
self.assertEqual('no operations found in macaroon',
exc.exception.args[0])
def test_need_declared(self):
locator = bakery.ThirdPartyStore()
first_party = common.new_bakery('first', locator)
third_party = common.new_bakery('third', locator)
# firstParty mints a macaroon with a third-party caveat addressed
# to thirdParty with a need-declared caveat.
m = first_party.oven.macaroon(
bakery.LATEST_VERSION, common.ages, [
checkers.need_declared_caveat(
checkers.Caveat(location='third', condition='something'),
['foo', 'bar']
)
], [bakery.LOGIN_OP])
# The client asks for a discharge macaroon for each third party caveat.
def get_discharge(cav, payload):
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
third_party.oven.key,
common.ThirdPartyStrcmpChecker('something'),
third_party.oven.locator,
)
d = bakery.discharge_all(m, get_discharge)
# The required declared attributes should have been added
# to the discharge macaroons.
declared = checkers.infer_declared(d, first_party.checker.namespace())
self.assertEqual(declared, {
'foo': '',
'bar': '',
})
# Make sure the macaroons actually check out correctly
# when provided with the declared checker.
ctx = checkers.context_with_declared(common.test_context, declared)
first_party.checker.auth([d]).allow(ctx, [bakery.LOGIN_OP])
# Try again when the third party does add a required declaration.
# The client asks for a discharge macaroon for each third party caveat.
def get_discharge(cav, payload):
checker = common.ThirdPartyCheckerWithCaveats([
checkers.declared_caveat('foo', 'a'),
checkers.declared_caveat('arble', 'b')
])
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
third_party.oven.key,
checker,
third_party.oven.locator,
)
d = bakery.discharge_all(m, get_discharge)
# One attribute should have been added, the other was already there.
declared = checkers.infer_declared(d, first_party.checker.namespace())
self.assertEqual(declared, {
'foo': 'a',
'bar': '',
'arble': 'b',
})
ctx = checkers.context_with_declared(common.test_context, declared)
first_party.checker.auth([d]).allow(ctx, [bakery.LOGIN_OP])
# Try again, but this time pretend a client is sneakily trying
# to add another 'declared' attribute to alter the declarations.
def get_discharge(cav, payload):
checker = common.ThirdPartyCheckerWithCaveats([
checkers.declared_caveat('foo', 'a'),
checkers.declared_caveat('arble', 'b'),
])
# Sneaky client adds a first party caveat.
m = bakery.discharge(
common.test_context, cav.caveat_id_bytes,
payload,
third_party.oven.key, checker,
third_party.oven.locator,
)
m.add_caveat(checkers.declared_caveat('foo', 'c'), None, None)
return m
d = bakery.discharge_all(m, get_discharge)
declared = checkers.infer_declared(d, first_party.checker.namespace())
self.assertEqual(declared, {
'bar': '',
'arble': 'b',
})
with self.assertRaises(bakery.AuthInitError) as exc:
first_party.checker.auth([d]).allow(common.test_context,
bakery.LOGIN_OP)
self.assertEqual('cannot authorize login macaroon: caveat '
'"declared foo a" not satisfied: got foo=null, '
'expected "a"', exc.exception.args[0])
def _get_authentication_caveat(location, domain=""):
"""Return a Caveat requiring the user to be authenticated."""
condition = "is-authenticated-user"
if domain:
condition += " @" + domain
return checkers.Caveat(condition, location=location)
def test_discharge_two_need_declared(self):
locator = bakery.ThirdPartyStore()
first_party = common.new_bakery('first', locator)
third_party = common.new_bakery('third', locator)
# first_party mints a macaroon with two third party caveats
# with overlapping attributes.
m = first_party.oven.macaroon(
bakery.LATEST_VERSION,
common.ages, [
checkers.need_declared_caveat(
checkers.Caveat(location='third', condition='x'),
['foo', 'bar']),
checkers.need_declared_caveat(
checkers.Caveat(location='third', condition='y'),
['bar', 'baz']),
], [bakery.LOGIN_OP])
# The client asks for a discharge macaroon for each third party caveat.
# Since no declarations are added by the discharger,
def get_discharge(cav, payload):
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
third_party.oven.key,
common.ThirdPartyCaveatCheckerEmpty(),
third_party.oven.locator,
)
d = bakery.discharge_all(m, get_discharge)
declared = checkers.infer_declared(d, first_party.checker.namespace())
self.assertEqual(declared, {
'foo': '',
'bar': '',
'baz': '',
})
ctx = checkers.context_with_declared(common.test_context, declared)
first_party.checker.auth([d]).allow(ctx, [bakery.LOGIN_OP])
# If they return conflicting values, the discharge fails.
# The client asks for a discharge macaroon for each third party caveat.
# Since no declarations are added by the discharger,
class ThirdPartyCaveatCheckerF(bakery.ThirdPartyCaveatChecker):
def check_third_party_caveat(self, ctx, cav_info):
if cav_info.condition == b'x':
return [checkers.declared_caveat('foo', 'fooval1')]
if cav_info.condition == b'y':
return [
checkers.declared_caveat('foo', 'fooval2'),
checkers.declared_caveat('baz', 'bazval')
]
raise common.ThirdPartyCaveatCheckFailed('not matched')
def get_discharge(cav, payload):
return bakery.discharge(
common.test_context,
cav.caveat_id_bytes,
payload,
third_party.oven.key,
ThirdPartyCaveatCheckerF(),
third_party.oven.locator,
)
d = bakery.discharge_all(m, get_discharge)
declared = checkers.infer_declared(d, first_party.checker.namespace())
self.assertEqual(declared, {
'bar': '',
'baz': 'bazval',
})
with self.assertRaises(bakery.AuthInitError) as exc:
first_party.checker.auth([d]).allow(common.test_context,
bakery.LOGIN_OP)
self.assertEqual('cannot authorize login macaroon: caveat "declared '
'foo fooval1" not satisfied: got foo=null, expected '
'"fooval1"', exc.exception.args[0])
def identity_from_context(self, ctx):
return None, [
checkers.Caveat(location=self._location,
condition='is-authenticated-user')
]
def is_something_caveat():
return checkers.Caveat(condition='is something', namespace='testns')
