refactor the token controller
The token controller had quite a few case statements depending on which type of authentication was required based on the format of the authenticate request. This commit uses the generator pattern to give the token.controllers.Auth.authenticate() method the right authentication object based on the format of the request. Each authentication method just implements an `authenticate()` method that returns a tuple of information. Change-Id: I11f508dd55c910b122c4102a96252041f76d6224
This commit is contained in:
Lance Bragstad
parent
e361a3ad8e
commit
4c095ccf2f
@ -125,39 +125,45 @@ class AuthTest(unit.TestCase):
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class AuthBadRequests(AuthTest):
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class AuthBadRequests(AuthTest):
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def test_no_external_auth(self):
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def test_no_external_auth(self):
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"""Verify that _authenticate_external() raises exception if N/A."""
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"""Verify that _authenticate_external() raises exception if N/A."""
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external_method = token.controllers.ExternalAuthenticationMethod()
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request = webob.Request.blank('/')
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request = webob.Request.blank('/')
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self.assertRaises(
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self.assertRaises(
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token.controllers.ExternalAuthNotApplicable,
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token.controllers.ExternalAuthNotApplicable,
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self.controller._authenticate_external,
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external_method.authenticate,
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request, auth={})
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request, auth={})
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def test_empty_remote_user(self):
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def test_empty_remote_user(self):
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"""Verify exception is raised when REMOTE_USER is an empty string."""
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"""Verify exception is raised when REMOTE_USER is an empty string."""
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external_method = token.controllers.ExternalAuthenticationMethod()
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request = webob.Request.blank('/', environ={'REMOTE_USER': ''})
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request = webob.Request.blank('/', environ={'REMOTE_USER': ''})
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self.assertRaises(
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self.assertRaises(
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token.controllers.ExternalAuthNotApplicable,
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token.controllers.ExternalAuthNotApplicable,
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self.controller._authenticate_external,
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external_method.authenticate,
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request, auth={})
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request, auth={})
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def test_no_token_in_auth(self):
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def test_no_token_in_auth(self):
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"""Verify that _authenticate_token() raises exception if no token."""
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"""Verify that authenticate raises exception if no token."""
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token_method = token.controllers.TokenAuthenticationMethod()
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self.assertRaises(
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self.assertRaises(
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exception.ValidationError,
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exception.ValidationError,
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self.controller._authenticate_token,
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token_method.authenticate,
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None, {})
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None, {})
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def test_no_credentials_in_auth(self):
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def test_no_credentials_in_auth(self):
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"""Verify that _authenticate_local() raises exception if no creds."""
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"""Verify that the method generator raises exception if no creds."""
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self.assertRaises(
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self.assertRaises(
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exception.ValidationError,
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exception.ValidationError,
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self.controller._authenticate_local,
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token.controllers.authentication_method_generator,
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None, {})
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self.make_request(),
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{}
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)
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def test_empty_username_and_userid_in_auth(self):
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def test_empty_username_and_userid_in_auth(self):
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"""Verify that empty username and userID raises ValidationError."""
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"""Verify that empty username and userID raises ValidationError."""
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token_method = token.controllers.LocalAuthenticationMethod()
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self.assertRaises(
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self.assertRaises(
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exception.ValidationError,
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exception.ValidationError,
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self.controller._authenticate_local,
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token_method.authenticate,
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None, {'passwordCredentials': {'password': 'abc',
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None, {'passwordCredentials': {'password': 'abc',
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'userId': '', 'username': ''}})
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'userId': '', 'username': ''}})
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@ -35,6 +35,32 @@ CONF = keystone.conf.CONF
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LOG = log.getLogger(__name__)
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LOG = log.getLogger(__name__)
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def authentication_method_generator(request, auth):
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"""Given an request return a suitable authentication method.
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This is simply a generator to handle matching an authentication request
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with the appropriate authentication method.
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:param auth: Dictionary containing authentication information from the
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request.
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:returns: An authentication method class object.
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"""
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if auth is None:
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raise exception.ValidationError(attribute='auth',
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target='request body')
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if request.environ.get('REMOTE_USER'):
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method = ExternalAuthenticationMethod()
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elif 'token' in auth:
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method = TokenAuthenticationMethod()
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elif 'passwordCredentials' in auth:
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method = LocalAuthenticationMethod()
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else:
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raise exception.ValidationError(attribute='auth',
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target='request body')
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return method
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class ExternalAuthNotApplicable(Exception):
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class ExternalAuthNotApplicable(Exception):
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"""External authentication is not applicable."""
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"""External authentication is not applicable."""
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@ -80,22 +106,11 @@ class Auth(controller.V2Controller):
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Alternatively, this call accepts auth with only a token and tenant
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Alternatively, this call accepts auth with only a token and tenant
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that will return a token that is scoped to that tenant.
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that will return a token that is scoped to that tenant.
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"""
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"""
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if auth is None:
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method = authentication_method_generator(request, auth)
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raise exception.ValidationError(attribute='auth',
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user_ref, project_id, expiry, bind, audit_id = (
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target='request body')
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method.authenticate(request, auth)
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)
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if 'token' in auth:
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# Try to authenticate using a token
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auth_info = self._authenticate_token(request, auth)
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else:
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# Try external authentication
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try:
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auth_info = self._authenticate_external(request, auth)
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except ExternalAuthNotApplicable:
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# Try local authentication
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auth_info = self._authenticate_local(request, auth)
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user_ref, project_id, expiry, bind, audit_id = auth_info
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# Ensure the entities provided in the authentication information are
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# Ensure the entities provided in the authentication information are
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# valid and not disabled.
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# valid and not disabled.
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try:
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try:
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@ -142,177 +157,6 @@ class Auth(controller.V2Controller):
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return token_data
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return token_data
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def _restrict_scope(self, token_model_ref):
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# A trust token cannot be used to get another token
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if token_model_ref.trust_scoped:
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raise exception.Forbidden()
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if not CONF.token.allow_rescope_scoped_token:
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# Do not allow conversion from scoped tokens.
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if token_model_ref.project_scoped or token_model_ref.domain_scoped:
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raise exception.Forbidden(action=_("rescope a scoped token"))
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def _authenticate_token(self, request, auth):
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"""Try to authenticate using an already existing token.
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:param request: request object
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:param auth: Dictionary representing the authentication request
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:returns: A tuple containing the user reference, project identifier,
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token expiration, bind information, and original audit
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information.
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"""
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if 'token' not in auth:
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raise exception.ValidationError(
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attribute='token', target='auth')
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if 'id' not in auth['token']:
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raise exception.ValidationError(
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attribute='id', target='token')
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old_token = auth['token']['id']
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if len(old_token) > CONF.max_token_size:
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raise exception.ValidationSizeError(attribute='token',
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size=CONF.max_token_size)
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try:
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v3_token_data = self.token_provider_api.validate_token(
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old_token
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)
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# NOTE(lbragstad): Even though we are not using the v2.0 token
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# reference after we translate it in v3_to_v2_token(), we still
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# need to perform that check. We have to do this because
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# v3_to_v2_token will ensure we don't use specific tokens only
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# attainable via v3 to get new tokens on v2.0. For example, an
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# exception would be raised if we passed a federated token to
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# v3_to_v2_token, because federated tokens aren't supported by
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# v2.0 (the same applies to OAuth tokens, domain-scoped tokens,
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# etc..).
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v2_helper = common.V2TokenDataHelper()
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v2_helper.v3_to_v2_token(v3_token_data, old_token)
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token_model_ref = token_model.KeystoneToken(
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token_id=old_token,
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token_data=v3_token_data
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)
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except exception.NotFound as e:
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raise exception.Unauthorized(e)
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wsgi.validate_token_bind(request.context_dict, token_model_ref)
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self._restrict_scope(token_model_ref)
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user_id = token_model_ref.user_id
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tenant_id = self._get_project_id_from_auth(auth)
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if not CONF.trust.enabled and 'trust_id' in auth:
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raise exception.Forbidden('Trusts are disabled.')
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elif CONF.trust.enabled and 'trust_id' in auth:
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try:
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trust_ref = self.trust_api.get_trust(auth['trust_id'])
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except exception.TrustNotFound:
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raise exception.Forbidden()
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# If a trust is being used to obtain access to another project and
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# the other project doesn't match the project in the trust, we need
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# to bail because trusts are only good up to a single project.
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if (trust_ref['project_id'] and
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tenant_id != trust_ref['project_id']):
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raise exception.Forbidden()
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expiry = token_model_ref.expires
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user_ref = self.identity_api.get_user(user_id)
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bind = token_model_ref.bind
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original_audit_id = token_model_ref.audit_chain_id
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return (user_ref, tenant_id, expiry, bind, original_audit_id)
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def _authenticate_local(self, request, auth):
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"""Try to authenticate against the identity backend.
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:param request: request object
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:param auth: Dictionary representing the authentication request
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:returns: A tuple containing the user reference, project identifier,
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token expiration, bind information, and original audit
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information.
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"""
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if 'passwordCredentials' not in auth:
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raise exception.ValidationError(
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attribute='passwordCredentials', target='auth')
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if 'password' not in auth['passwordCredentials']:
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raise exception.ValidationError(
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attribute='password', target='passwordCredentials')
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password = auth['passwordCredentials']['password']
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if password and len(password) > CONF.identity.max_password_length:
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raise exception.ValidationSizeError(
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attribute='password', size=CONF.identity.max_password_length)
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if (not auth['passwordCredentials'].get('userId') and
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not auth['passwordCredentials'].get('username')):
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raise exception.ValidationError(
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attribute='username or userId',
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target='passwordCredentials')
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user_id = auth['passwordCredentials'].get('userId')
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if user_id and len(user_id) > CONF.max_param_size:
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raise exception.ValidationSizeError(attribute='userId',
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size=CONF.max_param_size)
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username = auth['passwordCredentials'].get('username', '')
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if username:
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if len(username) > CONF.max_param_size:
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raise exception.ValidationSizeError(attribute='username',
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size=CONF.max_param_size)
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try:
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user_ref = self.identity_api.get_user_by_name(
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username, CONF.identity.default_domain_id)
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user_id = user_ref['id']
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except exception.UserNotFound as e:
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raise exception.Unauthorized(e)
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try:
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user_ref = self.identity_api.authenticate(
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request,
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user_id=user_id,
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password=password)
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except AssertionError as e:
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raise exception.Unauthorized(e.args[0])
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tenant_id = self._get_project_id_from_auth(auth)
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expiry = common.default_expire_time()
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bind = None
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audit_id = None
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return (user_ref, tenant_id, expiry, bind, audit_id)
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def _authenticate_external(self, request, auth):
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"""Try to authenticate an external user via REMOTE_USER variable.
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:param request: request object
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:param auth: Dictionary representing the authentication request
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:returns: A tuple containing the user reference, project identifier,
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token expiration, bind information, and original audit
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information.
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"""
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username = request.environ.get('REMOTE_USER')
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if not username:
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raise ExternalAuthNotApplicable()
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try:
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user_ref = self.identity_api.get_user_by_name(
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username, CONF.identity.default_domain_id)
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except exception.UserNotFound as e:
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raise exception.Unauthorized(e)
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tenant_id = self._get_project_id_from_auth(auth)
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expiry = common.default_expire_time()
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bind = None
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if ('kerberos' in CONF.token.bind and
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request.environ.get('AUTH_TYPE', '').lower() == 'negotiate'):
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bind = {'kerberos': username}
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audit_id = None
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return (user_ref, tenant_id, expiry, bind, audit_id)
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def _get_auth_token_data(self, user, tenant, metadata, expiry, audit_id):
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def _get_auth_token_data(self, user, tenant, metadata, expiry, audit_id):
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return dict(user=user,
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return dict(user=user,
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tenant=tenant,
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tenant=tenant,
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@ -320,37 +164,6 @@ class Auth(controller.V2Controller):
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expires=expiry,
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expires=expiry,
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parent_audit_id=audit_id)
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parent_audit_id=audit_id)
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def _get_project_id_from_auth(self, auth):
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"""Extract and normalize tenant information from auth dict.
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:param auth: Dictionary representing the authentication request.
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:returns: A string representing the project in the authentication
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request. If project scope isn't present in the request None
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is returned.
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"""
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tenant_id = auth.get('tenantId')
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if tenant_id and len(tenant_id) > CONF.max_param_size:
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raise exception.ValidationSizeError(attribute='tenantId',
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size=CONF.max_param_size)
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tenant_name = auth.get('tenantName')
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if tenant_name and len(tenant_name) > CONF.max_param_size:
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raise exception.ValidationSizeError(attribute='tenantName',
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size=CONF.max_param_size)
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if tenant_name:
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if (CONF.resource.project_name_url_safe == 'strict' and
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utils.is_not_url_safe(tenant_name)):
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msg = _('Tenant name cannot contain reserved characters.')
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raise exception.Unauthorized(message=msg)
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try:
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tenant_ref = self.resource_api.get_project_by_name(
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tenant_name, CONF.identity.default_domain_id)
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tenant_id = tenant_ref['id']
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except exception.ProjectNotFound as e:
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raise exception.Unauthorized(e)
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return tenant_id
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def _token_belongs_to(self, token, belongs_to):
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def _token_belongs_to(self, token, belongs_to):
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"""Check if the token belongs to the right project.
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"""Check if the token belongs to the right project.
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@ -482,3 +295,225 @@ class Auth(controller.V2Controller):
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})
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})
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return {'endpoints': endpoints, 'endpoints_links': []}
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return {'endpoints': endpoints, 'endpoints_links': []}
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@dependency.requires('resource_api', 'identity_api')
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class BaseAuthenticationMethod(object):
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"""Common utilities/dependencies for all authentication method classes."""
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def _get_project_id_from_auth(self, auth):
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"""Extract and normalize project information from auth dict.
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:param auth: Dictionary representing the authentication request.
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:returns: A string representing the project in the authentication
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request. If project scope isn't present in the request None
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is returned.
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"""
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project_id = auth.get('tenantId')
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project_name = auth.get('tenantName')
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if project_id:
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if len(project_id) > CONF.max_param_size:
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raise exception.ValidationSizeError(
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attribute='tenantId', size=CONF.max_param_size
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)
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elif project_name:
|
||||||
|
if len(project_name) > CONF.max_param_size:
|
||||||
|
raise exception.ValidationSizeError(
|
||||||
|
attribute='tenantName', size=CONF.max_param_size
|
||||||
|
)
|
||||||
|
if (CONF.resource.project_name_url_safe == 'strict' and
|
||||||
|
utils.is_not_url_safe(project_name)):
|
||||||
|
msg = _('Tenant name cannot contain reserved characters.')
|
||||||
|
raise exception.Unauthorized(message=msg)
|
||||||
|
try:
|
||||||
|
project_id = self.resource_api.get_project_by_name(
|
||||||
|
project_name, CONF.identity.default_domain_id
|
||||||
|
)['id']
|
||||||
|
except exception.ProjectNotFound as e:
|
||||||
|
raise exception.Unauthorized(e)
|
||||||
|
else:
|
||||||
|
project_id = None
|
||||||
|
|
||||||
|
return project_id
|
||||||
|
|
||||||
|
|
||||||
|
@dependency.requires('token_provider_api', 'trust_api')
|
||||||
|
class TokenAuthenticationMethod(BaseAuthenticationMethod):
|
||||||
|
"""Authenticate using an existing token."""
|
||||||
|
|
||||||
|
def _restrict_scope(self, token_model_ref):
|
||||||
|
"""Determine if rescoping is allowed based on the token model.
|
||||||
|
|
||||||
|
:param token_model_ref: `keystone.models.token.KeystoneToken` object.
|
||||||
|
"""
|
||||||
|
# A trust token cannot be used to get another token
|
||||||
|
if token_model_ref.trust_scoped:
|
||||||
|
raise exception.Forbidden()
|
||||||
|
if not CONF.token.allow_rescope_scoped_token:
|
||||||
|
# Do not allow conversion from scoped tokens.
|
||||||
|
if token_model_ref.project_scoped or token_model_ref.domain_scoped:
|
||||||
|
raise exception.Forbidden(action=_('rescope a scoped token'))
|
||||||
|
|
||||||
|
def authenticate(self, request, auth):
|
||||||
|
"""Try to authenticate using an already existing token.
|
||||||
|
|
||||||
|
:param request: A request object.
|
||||||
|
:param auth: Dictionary representing the authentication request.
|
||||||
|
:returns: A tuple containing the user reference, project identifier,
|
||||||
|
token expiration, bind information, and original audit
|
||||||
|
information.
|
||||||
|
"""
|
||||||
|
if 'token' not in auth:
|
||||||
|
raise exception.ValidationError(
|
||||||
|
attribute='token', target='auth')
|
||||||
|
|
||||||
|
if 'id' not in auth['token']:
|
||||||
|
raise exception.ValidationError(
|
||||||
|
attribute='id', target='token')
|
||||||
|
|
||||||
|
old_token = auth['token']['id']
|
||||||
|
if len(old_token) > CONF.max_token_size:
|
||||||
|
raise exception.ValidationSizeError(attribute='token',
|
||||||
|
size=CONF.max_token_size)
|
||||||
|
|
||||||
|
try:
|
||||||
|
v3_token_data = self.token_provider_api.validate_token(
|
||||||
|
old_token
|
||||||
|
)
|
||||||
|
# NOTE(lbragstad): Even though we are not using the v2.0 token
|
||||||
|
# reference after we translate it in v3_to_v2_token(), we still
|
||||||
|
# need to perform that check. We have to do this because
|
||||||
|
# v3_to_v2_token will ensure we don't use specific tokens only
|
||||||
|
# attainable via v3 to get new tokens on v2.0. For example, an
|
||||||
|
# exception would be raised if we passed a federated token to
|
||||||
|
# v3_to_v2_token, because federated tokens aren't supported by
|
||||||
|
# v2.0 (the same applies to OAuth tokens, domain-scoped tokens,
|
||||||
|
# etc..).
|
||||||
|
v2_helper = common.V2TokenDataHelper()
|
||||||
|
v2_helper.v3_to_v2_token(v3_token_data, old_token)
|
||||||
|
token_model_ref = token_model.KeystoneToken(
|
||||||
|
token_id=old_token,
|
||||||
|
token_data=v3_token_data
|
||||||
|
)
|
||||||
|
except exception.NotFound as e:
|
||||||
|
raise exception.Unauthorized(e)
|
||||||
|
|
||||||
|
wsgi.validate_token_bind(request.context_dict, token_model_ref)
|
||||||
|
|
||||||
|
self._restrict_scope(token_model_ref)
|
||||||
|
user_id = token_model_ref.user_id
|
||||||
|
project_id = self._get_project_id_from_auth(auth)
|
||||||
|
|
||||||
|
if not CONF.trust.enabled and 'trust_id' in auth:
|
||||||
|
raise exception.Forbidden('Trusts are disabled.')
|
||||||
|
elif CONF.trust.enabled and 'trust_id' in auth:
|
||||||
|
try:
|
||||||
|
trust_ref = self.trust_api.get_trust(auth['trust_id'])
|
||||||
|
except exception.TrustNotFound:
|
||||||
|
raise exception.Forbidden()
|
||||||
|
# If a trust is being used to obtain access to another project and
|
||||||
|
# the other project doesn't match the project in the trust, we need
|
||||||
|
# to bail because trusts are only good up to a single project.
|
||||||
|
if (trust_ref['project_id'] and
|
||||||
|
project_id != trust_ref['project_id']):
|
||||||
|
raise exception.Forbidden()
|
||||||
|
|
||||||
|
expiry = token_model_ref.expires
|
||||||
|
user_ref = self.identity_api.get_user(user_id)
|
||||||
|
bind = token_model_ref.bind
|
||||||
|
original_audit_id = token_model_ref.audit_chain_id
|
||||||
|
return (user_ref, project_id, expiry, bind, original_audit_id)
|
||||||
|
|
||||||
|
|
||||||
|
class LocalAuthenticationMethod(BaseAuthenticationMethod):
|
||||||
|
"""Authenticate against a local backend using password credentials."""
|
||||||
|
|
||||||
|
def authenticate(self, request, auth):
|
||||||
|
"""Try to authenticate against the identity backend.
|
||||||
|
|
||||||
|
:param request: A request object.
|
||||||
|
:param auth: Dictionary representing the authentication request.
|
||||||
|
:returns: A tuple containing the user reference, project identifier,
|
||||||
|
token expiration, bind information, and original audit
|
||||||
|
information.
|
||||||
|
"""
|
||||||
|
if 'password' not in auth['passwordCredentials']:
|
||||||
|
raise exception.ValidationError(
|
||||||
|
attribute='password', target='passwordCredentials')
|
||||||
|
|
||||||
|
password = auth['passwordCredentials']['password']
|
||||||
|
if password and len(password) > CONF.identity.max_password_length:
|
||||||
|
raise exception.ValidationSizeError(
|
||||||
|
attribute='password', size=CONF.identity.max_password_length)
|
||||||
|
|
||||||
|
if (not auth['passwordCredentials'].get('userId') and
|
||||||
|
not auth['passwordCredentials'].get('username')):
|
||||||
|
raise exception.ValidationError(
|
||||||
|
attribute='username or userId',
|
||||||
|
target='passwordCredentials')
|
||||||
|
|
||||||
|
user_id = auth['passwordCredentials'].get('userId')
|
||||||
|
if user_id and len(user_id) > CONF.max_param_size:
|
||||||
|
raise exception.ValidationSizeError(attribute='userId',
|
||||||
|
size=CONF.max_param_size)
|
||||||
|
|
||||||
|
username = auth['passwordCredentials'].get('username', '')
|
||||||
|
|
||||||
|
if username:
|
||||||
|
if len(username) > CONF.max_param_size:
|
||||||
|
raise exception.ValidationSizeError(attribute='username',
|
||||||
|
size=CONF.max_param_size)
|
||||||
|
try:
|
||||||
|
user_ref = self.identity_api.get_user_by_name(
|
||||||
|
username, CONF.identity.default_domain_id)
|
||||||
|
user_id = user_ref['id']
|
||||||
|
except exception.UserNotFound as e:
|
||||||
|
raise exception.Unauthorized(e)
|
||||||
|
|
||||||
|
try:
|
||||||
|
user_ref = self.identity_api.authenticate(
|
||||||
|
request,
|
||||||
|
user_id=user_id,
|
||||||
|
password=password)
|
||||||
|
except AssertionError as e:
|
||||||
|
raise exception.Unauthorized(e.args[0])
|
||||||
|
|
||||||
|
project_id = self._get_project_id_from_auth(auth)
|
||||||
|
expiry = common.default_expire_time()
|
||||||
|
bind = None
|
||||||
|
audit_id = None
|
||||||
|
return (user_ref, project_id, expiry, bind, audit_id)
|
||||||
|
|
||||||
|
|
||||||
|
class ExternalAuthenticationMethod(BaseAuthenticationMethod):
|
||||||
|
"""Authenticate using an external authentication method."""
|
||||||
|
|
||||||
|
def authenticate(self, request, auth):
|
||||||
|
"""Try to authenticate an external user via REMOTE_USER variable.
|
||||||
|
|
||||||
|
:param request: A request object.
|
||||||
|
:param auth: Dictionary representing the authentication request.
|
||||||
|
:returns: A tuple containing the user reference, project identifier,
|
||||||
|
token expiration, bind information, and original audit
|
||||||
|
information.
|
||||||
|
"""
|
||||||
|
username = request.environ.get('REMOTE_USER')
|
||||||
|
|
||||||
|
if not username:
|
||||||
|
raise ExternalAuthNotApplicable()
|
||||||
|
|
||||||
|
try:
|
||||||
|
user_ref = self.identity_api.get_user_by_name(
|
||||||
|
username, CONF.identity.default_domain_id)
|
||||||
|
except exception.UserNotFound as e:
|
||||||
|
raise exception.Unauthorized(e)
|
||||||
|
|
||||||
|
tenant_id = self._get_project_id_from_auth(auth)
|
||||||
|
expiry = common.default_expire_time()
|
||||||
|
bind = None
|
||||||
|
if ('kerberos' in CONF.token.bind and
|
||||||
|
request.environ.get('AUTH_TYPE', '').lower() == 'negotiate'):
|
||||||
|
bind = {'kerberos': username}
|
||||||
|
audit_id = None
|
||||||
|
return (user_ref, tenant_id, expiry, bind, audit_id)
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user