diff --git a/doc/source/library/auth.rst b/doc/source/library/auth.rst
new file mode 100644
index 0000000..e1d92ed
--- /dev/null
+++ b/doc/source/library/auth.rst
@@ -0,0 +1,11 @@
+.. _auth:
+
+Authentication Framework Usage
+==============================
+
+---------------
+The auth module
+---------------
+
+.. automodule:: tempest.lib.auth
+   :members:
diff --git a/releasenotes/notes/add-scope-to-auth-b5a82493ea89f41e.yaml b/releasenotes/notes/add-scope-to-auth-b5a82493ea89f41e.yaml
new file mode 100644
index 0000000..297279f
--- /dev/null
+++ b/releasenotes/notes/add-scope-to-auth-b5a82493ea89f41e.yaml
@@ -0,0 +1,7 @@
+---
+features:
+  - Tempest library auth interface now supports scope. Scope allows to control
+    the scope of tokens requested via the identity API. Identity V2 supports
+    unscoped and project scoped tokens, but only the latter are implemented.
+    Identity V3 supports unscoped, project and domain scoped token, all three
+    are available.
\ No newline at end of file
diff --git a/tempest/clients.py b/tempest/clients.py
index 2ad1733..b0f779f 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -197,14 +197,15 @@
     }
     default_params_with_timeout_values.update(default_params)
 
-    def __init__(self, credentials, service=None):
+    def __init__(self, credentials, service=None, scope='project'):
         """Initialization of Manager class.
 
         Setup all services clients and make them available for tests cases.
         :param credentials: type Credentials or TestResources
         :param service: Service name
+        :param scope: default scope for tokens produced by the auth provider
         """
-        super(Manager, self).__init__(credentials=credentials)
+        super(Manager, self).__init__(credentials=credentials, scope=scope)
         self._set_compute_clients()
         self._set_database_clients()
         self._set_identity_clients()
diff --git a/tempest/lib/auth.py b/tempest/lib/auth.py
index a6833be..ffcc4fb 100644
--- a/tempest/lib/auth.py
+++ b/tempest/lib/auth.py
@@ -68,10 +68,16 @@
 class AuthProvider(object):
     """Provide authentication"""
 
-    def __init__(self, credentials):
+    SCOPES = set(['project'])
+
+    def __init__(self, credentials, scope='project'):
         """Auth provider __init__
 
         :param credentials: credentials for authentication
+        :param scope: the default scope to be used by the credential providers
+                      when requesting a token. Valid values depend on the
+                      AuthProvider class implementation, and are defined in
+                      the set SCOPES. Default value is 'project'.
         """
         if self.check_credentials(credentials):
             self.credentials = credentials
@@ -88,6 +94,8 @@
                 raise TypeError("credentials object is of type %s, which is"
                                 " not a valid Credentials object type." %
                                 credentials.__class__.__name__)
+        self._scope = None
+        self.scope = scope
         self.cache = None
         self.alt_auth_data = None
         self.alt_part = None
@@ -123,8 +131,14 @@
 
     @property
     def auth_data(self):
+        """Auth data for set scope"""
         return self.get_auth()
 
+    @property
+    def scope(self):
+        """Scope used in auth requests"""
+        return self._scope
+
     @auth_data.deleter
     def auth_data(self):
         self.clear_auth()
@@ -139,7 +153,7 @@
         """Forces setting auth.
 
         Forces setting auth, ignores cache if it exists.
-        Refills credentials
+        Refills credentials.
         """
         self.cache = self._get_auth()
         self._fill_credentials(self.cache[1])
@@ -222,6 +236,19 @@
         """Extracts the base_url based on provided filters"""
         return
 
+    @scope.setter
+    def scope(self, value):
+        """Set the scope to be used in token requests
+
+        :param scope: scope to be used. If the scope is different, clear caches
+        """
+        if value not in self.SCOPES:
+            raise exceptions.InvalidScope(
+                scope=value, auth_provider=self.__class__.__name__)
+        if value != self.scope:
+            self.clear_auth()
+            self._scope = value
+
 
 class KeystoneAuthProvider(AuthProvider):
 
@@ -231,17 +258,18 @@
 
     def __init__(self, credentials, auth_url,
                  disable_ssl_certificate_validation=None,
-                 ca_certs=None, trace_requests=None):
-        super(KeystoneAuthProvider, self).__init__(credentials)
+                 ca_certs=None, trace_requests=None, scope='project'):
+        super(KeystoneAuthProvider, self).__init__(credentials, scope)
         self.dsvm = disable_ssl_certificate_validation
         self.ca_certs = ca_certs
         self.trace_requests = trace_requests
+        self.auth_url = auth_url
         self.auth_client = self._auth_client(auth_url)
 
     def _decorate_request(self, filters, method, url, headers=None, body=None,
                           auth_data=None):
         if auth_data is None:
-            auth_data = self.auth_data
+            auth_data = self.get_auth()
         token, _ = auth_data
         base_url = self.base_url(filters=filters, auth_data=auth_data)
         # build authenticated request
@@ -265,6 +293,11 @@
 
     @abc.abstractmethod
     def _auth_params(self):
+        """Auth parameters to be passed to the token request
+
+        By default all fields available in Credentials are passed to the
+        token request. Scope may affect this.
+        """
         return
 
     def _get_auth(self):
@@ -292,10 +325,17 @@
         return expiry
 
     def get_token(self):
-        return self.auth_data[0]
+        return self.get_auth()[0]
 
 
 class KeystoneV2AuthProvider(KeystoneAuthProvider):
+    """Provides authentication based on the Identity V2 API
+
+    The Keystone Identity V2 API defines both unscoped and project scoped
+    tokens. This auth provider only implements 'project'.
+    """
+
+    SCOPES = set(['project'])
 
     def _auth_client(self, auth_url):
         return json_v2id.TokenClient(
@@ -303,6 +343,10 @@
             ca_certs=self.ca_certs, trace_requests=self.trace_requests)
 
     def _auth_params(self):
+        """Auth parameters to be passed to the token request
+
+        All fields available in Credentials are passed to the token request.
+        """
         return dict(
             user=self.credentials.username,
             password=self.credentials.password,
@@ -332,7 +376,7 @@
         - skip_path: take just the base URL
         """
         if auth_data is None:
-            auth_data = self.auth_data
+            auth_data = self.get_auth()
         token, _auth_data = auth_data
         service = filters.get('service')
         region = filters.get('region')
@@ -365,6 +409,9 @@
 
 
 class KeystoneV3AuthProvider(KeystoneAuthProvider):
+    """Provides authentication based on the Identity V3 API"""
+
+    SCOPES = set(['project', 'domain', 'unscoped', None])
 
     def _auth_client(self, auth_url):
         return json_v3id.V3TokenClient(
@@ -372,20 +419,36 @@
             ca_certs=self.ca_certs, trace_requests=self.trace_requests)
 
     def _auth_params(self):
-        return dict(
+        """Auth parameters to be passed to the token request
+
+        Fields available in Credentials are passed to the token request,
+        depending on the value of scope. Valid values for scope are: "project",
+        "domain". Any other string (e.g. "unscoped") or None will lead to an
+        unscoped token request.
+        """
+
+        auth_params = dict(
             user_id=self.credentials.user_id,
             username=self.credentials.username,
-            password=self.credentials.password,
-            project_id=self.credentials.project_id,
-            project_name=self.credentials.project_name,
             user_domain_id=self.credentials.user_domain_id,
             user_domain_name=self.credentials.user_domain_name,
-            project_domain_id=self.credentials.project_domain_id,
-            project_domain_name=self.credentials.project_domain_name,
-            domain_id=self.credentials.domain_id,
-            domain_name=self.credentials.domain_name,
+            password=self.credentials.password,
             auth_data=True)
 
+        if self.scope == 'project':
+            auth_params.update(
+                project_domain_id=self.credentials.project_domain_id,
+                project_domain_name=self.credentials.project_domain_name,
+                project_id=self.credentials.project_id,
+                project_name=self.credentials.project_name)
+
+        if self.scope == 'domain':
+            auth_params.update(
+                domain_id=self.credentials.domain_id,
+                domain_name=self.credentials.domain_name)
+
+        return auth_params
+
     def _fill_credentials(self, auth_data_body):
         # project or domain, depending on the scope
         project = auth_data_body.get('project', None)
@@ -422,6 +485,10 @@
     def base_url(self, filters, auth_data=None):
         """Base URL from catalog
 
+        If scope is not 'project', it may be that there is not catalog in
+        the auth_data. In such case, as long as the requested service is
+        'identity', we can use the original auth URL to build the base_url.
+
         Filters can be:
         - service: compute, image, etc
         - region: the service region
@@ -430,7 +497,7 @@
         - skip_path: take just the base URL
         """
         if auth_data is None:
-            auth_data = self.auth_data
+            auth_data = self.get_auth()
         token, _auth_data = auth_data
         service = filters.get('service')
         region = filters.get('region')
@@ -442,14 +509,20 @@
         if 'URL' in endpoint_type:
             endpoint_type = endpoint_type.replace('URL', '')
         _base_url = None
-        catalog = _auth_data['catalog']
+        catalog = _auth_data.get('catalog', [])
         # Select entries with matching service type
         service_catalog = [ep for ep in catalog if ep['type'] == service]
         if len(service_catalog) > 0:
             service_catalog = service_catalog[0]['endpoints']
         else:
-            # No matching service
-            raise exceptions.EndpointNotFound(service)
+            if len(catalog) == 0 and service == 'identity':
+                # NOTE(andreaf) If there's no catalog at all and the service
+                # is identity, it's a valid use case. Having a non-empty
+                # catalog with no identity in it is not valid instead.
+                return apply_url_filters(self.auth_url, filters)
+            else:
+                # No matching service
+                raise exceptions.EndpointNotFound(service)
         # Filter by endpoint type (interface)
         filtered_catalog = [ep for ep in service_catalog if
                             ep['interface'] == endpoint_type]
@@ -465,7 +538,7 @@
         # There should be only one match. If not take the first.
         _base_url = filtered_catalog[0].get('url', None)
         if _base_url is None:
-                raise exceptions.EndpointNotFound(service)
+            raise exceptions.EndpointNotFound(service)
         return apply_url_filters(_base_url, filters)
 
     def is_expired(self, auth_data):
@@ -669,7 +742,7 @@
     def is_valid(self):
         """Check of credentials (no API call)
 
-        Valid combinations of v3 credentials (excluding token, scope)
+        Valid combinations of v3 credentials (excluding token)
         - User id, password (optional domain)
         - User name, password and its domain id/name
         For the scope, valid combinations are:
diff --git a/tempest/lib/exceptions.py b/tempest/lib/exceptions.py
index b9b2ae9..259bbbb 100644
--- a/tempest/lib/exceptions.py
+++ b/tempest/lib/exceptions.py
@@ -207,6 +207,10 @@
     message = "Invalid Credentials"
 
 
+class InvalidScope(TempestException):
+    message = "Invalid Scope %(scope)s for %(auth_provider)s"
+
+
 class SSHTimeout(TempestException):
     message = ("Connection to the %(host)s via SSH timed out.\n"
                "User: %(user)s, Password: %(password)s")
diff --git a/tempest/manager.py b/tempest/manager.py
index c97e0d1..cafa5b9 100644
--- a/tempest/manager.py
+++ b/tempest/manager.py
@@ -28,13 +28,14 @@
     and a client object for a test case to use in performing actions.
     """
 
-    def __init__(self, credentials):
+    def __init__(self, credentials, scope='project'):
         """Initialization of base manager class
 
         Credentials to be used within the various client classes managed by the
         Manager object must be defined.
 
         :param credentials: type Credentials or TestResources
+        :param scope: default scope for tokens produced by the auth provider
         """
         self.credentials = credentials
         # Check if passed or default credentials are valid
@@ -48,7 +49,8 @@
         else:
             creds = self.credentials
         # Creates an auth provider for the credentials
-        self.auth_provider = get_auth_provider(creds, pre_auth=True)
+        self.auth_provider = get_auth_provider(creds, pre_auth=True,
+                                               scope=scope)
 
 
 def get_auth_provider_class(credentials):
@@ -58,7 +60,7 @@
         return auth.KeystoneV2AuthProvider, CONF.identity.uri
 
 
-def get_auth_provider(credentials, pre_auth=False):
+def get_auth_provider(credentials, pre_auth=False, scope='project'):
     default_params = {
         'disable_ssl_certificate_validation':
             CONF.identity.disable_ssl_certificate_validation,
@@ -71,6 +73,7 @@
     auth_provider_class, auth_url = get_auth_provider_class(
         credentials)
     _auth_provider = auth_provider_class(credentials, auth_url,
+                                         scope=scope,
                                          **default_params)
     if pre_auth:
         _auth_provider.set_auth()
diff --git a/tempest/tests/lib/fake_credentials.py b/tempest/tests/lib/fake_credentials.py
index fb81bd6..eac4ada 100644
--- a/tempest/tests/lib/fake_credentials.py
+++ b/tempest/tests/lib/fake_credentials.py
@@ -57,3 +57,18 @@
             user_domain_name='fake_domain_name'
         )
         super(FakeKeystoneV3DomainCredentials, self).__init__(**creds)
+
+
+class FakeKeystoneV3AllCredentials(auth.KeystoneV3Credentials):
+    """Fake credentials for the Keystone Identity V3 API, with no scope"""
+
+    def __init__(self):
+        creds = dict(
+            username='fake_username',
+            password='fake_password',
+            user_domain_name='fake_domain_name',
+            project_name='fake_tenant_name',
+            project_domain_name='fake_domain_name',
+            domain_name='fake_domain_name'
+        )
+        super(FakeKeystoneV3AllCredentials, self).__init__(**creds)
diff --git a/tempest/tests/lib/fake_identity.py b/tempest/tests/lib/fake_identity.py
index 5732065..c903e47 100644
--- a/tempest/tests/lib/fake_identity.py
+++ b/tempest/tests/lib/fake_identity.py
@@ -133,6 +133,49 @@
     }
 }
 
+IDENTITY_V3_RESPONSE_DOMAIN_SCOPE = {
+    "token": {
+        "methods": [
+            "token",
+            "password"
+        ],
+        "expires_at": "2020-01-01T00:00:10.000123Z",
+        "domain": {
+            "id": "fake_domain_id",
+            "name": "domain_name"
+        },
+        "user": {
+            "domain": {
+                "id": "fake_domain_id",
+                "name": "domain_name"
+            },
+            "id": "fake_user_id",
+            "name": "username"
+        },
+        "issued_at": "2013-05-29T16:55:21.468960Z",
+        "catalog": CATALOG_V3
+    }
+}
+
+IDENTITY_V3_RESPONSE_NO_SCOPE = {
+    "token": {
+        "methods": [
+            "token",
+            "password"
+        ],
+        "expires_at": "2020-01-01T00:00:10.000123Z",
+        "user": {
+            "domain": {
+                "id": "fake_domain_id",
+                "name": "domain_name"
+            },
+            "id": "fake_user_id",
+            "name": "username"
+        },
+        "issued_at": "2013-05-29T16:55:21.468960Z",
+    }
+}
+
 ALT_IDENTITY_V3 = IDENTITY_V3_RESPONSE
 
 
@@ -145,6 +188,28 @@
             json.dumps(IDENTITY_V3_RESPONSE))
 
 
+def _fake_v3_response_domain_scope(self, uri, method="GET", body=None,
+                                   headers=None, redirections=5,
+                                   connection_type=None):
+    fake_headers = {
+        "status": "201",
+        "x-subject-token": TOKEN
+    }
+    return (fake_http.fake_http_response(fake_headers, status=201),
+            json.dumps(IDENTITY_V3_RESPONSE_DOMAIN_SCOPE))
+
+
+def _fake_v3_response_no_scope(self, uri, method="GET", body=None,
+                               headers=None, redirections=5,
+                               connection_type=None):
+    fake_headers = {
+        "status": "201",
+        "x-subject-token": TOKEN
+    }
+    return (fake_http.fake_http_response(fake_headers, status=201),
+            json.dumps(IDENTITY_V3_RESPONSE_NO_SCOPE))
+
+
 def _fake_v2_response(self, uri, method="GET", body=None, headers=None,
                       redirections=5, connection_type=None):
     return (fake_http.fake_http_response({}, status=200),
diff --git a/tempest/tests/lib/test_auth.py b/tempest/tests/lib/test_auth.py
index cc71c92..c253187 100644
--- a/tempest/tests/lib/test_auth.py
+++ b/tempest/tests/lib/test_auth.py
@@ -15,6 +15,7 @@
 
 import copy
 import datetime
+import testtools
 
 from oslotest import mockpatch
 
@@ -425,6 +426,16 @@
             self.assertEqual(self.auth_provider.is_expired(auth_data),
                              should_be_expired)
 
+    def test_set_scope_all_valid(self):
+        for scope in self.auth_provider.SCOPES:
+            self.auth_provider.scope = scope
+            self.assertEqual(scope, self.auth_provider.scope)
+
+    def test_set_scope_invalid(self):
+        with testtools.ExpectedException(exceptions.InvalidScope,
+                                         '.* invalid_scope .*'):
+            self.auth_provider.scope = 'invalid_scope'
+
 
 class TestKeystoneV3AuthProvider(TestKeystoneV2AuthProvider):
     _endpoints = fake_identity.IDENTITY_V3_RESPONSE['token']['catalog']
@@ -529,6 +540,98 @@
         expected = 'http://fake_url/v3'
         self._test_base_url_helper(expected, filters, ('token', auth_data))
 
+    # Base URL test with scope only for V3
+    def test_base_url_scope_project(self):
+        self.auth_provider.scope = 'project'
+        self.filters = {
+            'service': 'compute',
+            'endpoint_type': 'publicURL',
+            'region': 'FakeRegion'
+        }
+        expected = self._get_result_url_from_endpoint(
+            self._endpoints[0]['endpoints'][1])
+        self._test_base_url_helper(expected, self.filters)
+
+    # Base URL test with scope only for V3
+    def test_base_url_unscoped_identity(self):
+        self.auth_provider.scope = 'unscoped'
+        self.patchobject(v3_client.V3TokenClient, 'raw_request',
+                         fake_identity._fake_v3_response_no_scope)
+        self.filters = {
+            'service': 'identity',
+            'endpoint_type': 'publicURL',
+            'region': 'FakeRegion'
+        }
+        expected = fake_identity.FAKE_AUTH_URL
+        self._test_base_url_helper(expected, self.filters)
+
+    # Base URL test with scope only for V3
+    def test_base_url_unscoped_other(self):
+        self.auth_provider.scope = 'unscoped'
+        self.patchobject(v3_client.V3TokenClient, 'raw_request',
+                         fake_identity._fake_v3_response_no_scope)
+        self.filters = {
+            'service': 'compute',
+            'endpoint_type': 'publicURL',
+            'region': 'FakeRegion'
+        }
+        self.assertRaises(exceptions.EndpointNotFound,
+                          self.auth_provider.base_url,
+                          auth_data=self.auth_provider.auth_data,
+                          filters=self.filters)
+
+    def test_auth_parameters_with_scope_unset(self):
+        # No scope defaults to 'project'
+        all_creds = fake_credentials.FakeKeystoneV3AllCredentials()
+        self.auth_provider.credentials = all_creds
+        auth_params = self.auth_provider._auth_params()
+        self.assertNotIn('scope', auth_params.keys())
+        for attr in all_creds.get_init_attributes():
+            if attr.startswith('domain_'):
+                self.assertNotIn(attr, auth_params.keys())
+            else:
+                self.assertIn(attr, auth_params.keys())
+                self.assertEqual(getattr(all_creds, attr), auth_params[attr])
+
+    def test_auth_parameters_with_project_scope(self):
+        all_creds = fake_credentials.FakeKeystoneV3AllCredentials()
+        self.auth_provider.credentials = all_creds
+        self.auth_provider.scope = 'project'
+        auth_params = self.auth_provider._auth_params()
+        self.assertNotIn('scope', auth_params.keys())
+        for attr in all_creds.get_init_attributes():
+            if attr.startswith('domain_'):
+                self.assertNotIn(attr, auth_params.keys())
+            else:
+                self.assertIn(attr, auth_params.keys())
+                self.assertEqual(getattr(all_creds, attr), auth_params[attr])
+
+    def test_auth_parameters_with_domain_scope(self):
+        all_creds = fake_credentials.FakeKeystoneV3AllCredentials()
+        self.auth_provider.credentials = all_creds
+        self.auth_provider.scope = 'domain'
+        auth_params = self.auth_provider._auth_params()
+        self.assertNotIn('scope', auth_params.keys())
+        for attr in all_creds.get_init_attributes():
+            if attr.startswith('project_'):
+                self.assertNotIn(attr, auth_params.keys())
+            else:
+                self.assertIn(attr, auth_params.keys())
+                self.assertEqual(getattr(all_creds, attr), auth_params[attr])
+
+    def test_auth_parameters_unscoped(self):
+        all_creds = fake_credentials.FakeKeystoneV3AllCredentials()
+        self.auth_provider.credentials = all_creds
+        self.auth_provider.scope = 'unscoped'
+        auth_params = self.auth_provider._auth_params()
+        self.assertNotIn('scope', auth_params.keys())
+        for attr in all_creds.get_init_attributes():
+            if attr.startswith('project_') or attr.startswith('domain_'):
+                self.assertNotIn(attr, auth_params.keys())
+            else:
+                self.assertIn(attr, auth_params.keys())
+                self.assertEqual(getattr(all_creds, attr), auth_params[attr])
+
 
 class TestKeystoneV3Credentials(base.TestCase):
     def testSetAttrUserDomain(self):
@@ -630,3 +733,20 @@
         self.assertEqual(
             'http://localhost/identity/v2.0/uuid/',
             auth.replace_version('http://localhost/identity/v3/uuid/', 'v2.0'))
+
+
+class TestKeystoneV3AuthProvider_DomainScope(BaseAuthTestsSetUp):
+    _endpoints = fake_identity.IDENTITY_V3_RESPONSE['token']['catalog']
+    _auth_provider_class = auth.KeystoneV3AuthProvider
+    credentials = fake_credentials.FakeKeystoneV3Credentials()
+
+    def setUp(self):
+        super(TestKeystoneV3AuthProvider_DomainScope, self).setUp()
+        self.patchobject(v3_client.V3TokenClient, 'raw_request',
+                         fake_identity._fake_v3_response_domain_scope)
+
+    def test_get_auth_with_domain_scope(self):
+        self.auth_provider.scope = 'domain'
+        _, auth_data = self.auth_provider.get_auth()
+        self.assertIn('domain', auth_data)
+        self.assertNotIn('project', auth_data)