diff --git a/tempest/api/compute/admin/test_quotas.py b/tempest/api/compute/admin/test_quotas.py
index 32e0478..d6d5592 100644
--- a/tempest/api/compute/admin/test_quotas.py
+++ b/tempest/api/compute/admin/test_quotas.py
@@ -28,8 +28,7 @@
 
         # NOTE(afazekas): these test cases should always create and use a new
         # tenant most of them should be skipped if we can't do that
-        cls.demo_tenant_id = cls.isolated_creds.get_primary_user().get(
-            'tenantId')
+        cls.demo_tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
 
         cls.default_quota_set = set(('injected_file_content_bytes',
                                      'metadata_items', 'injected_files',
diff --git a/tempest/api/compute/admin/test_quotas_negative.py b/tempest/api/compute/admin/test_quotas_negative.py
index 5b2b5fd..10c3243 100644
--- a/tempest/api/compute/admin/test_quotas_negative.py
+++ b/tempest/api/compute/admin/test_quotas_negative.py
@@ -33,8 +33,7 @@
 
         # NOTE(afazekas): these test cases should always create and use a new
         # tenant most of them should be skipped if we can't do that
-        cls.demo_tenant_id = cls.isolated_creds.get_primary_user().get(
-            'tenantId')
+        cls.demo_tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
 
     @test.attr(type=['negative', 'gate'])
     def test_update_quota_normal_user(self):
diff --git a/tempest/api/compute/v3/admin/test_quotas.py b/tempest/api/compute/v3/admin/test_quotas.py
index b70e254..27836fb 100644
--- a/tempest/api/compute/v3/admin/test_quotas.py
+++ b/tempest/api/compute/v3/admin/test_quotas.py
@@ -32,8 +32,7 @@
 
         # NOTE(afazekas): these test cases should always create and use a new
         # tenant most of them should be skipped if we can't do that
-        cls.demo_tenant_id = cls.isolated_creds.get_primary_user().get(
-            'tenantId')
+        cls.demo_tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
 
         cls.default_quota_set = set(('metadata_items',
                                      'ram', 'floating_ips',
diff --git a/tempest/api/compute/v3/admin/test_quotas_negative.py b/tempest/api/compute/v3/admin/test_quotas_negative.py
index d138e80..307462f 100644
--- a/tempest/api/compute/v3/admin/test_quotas_negative.py
+++ b/tempest/api/compute/v3/admin/test_quotas_negative.py
@@ -30,8 +30,7 @@
 
         # NOTE(afazekas): these test cases should always create and use a new
         # tenant most of them should be skipped if we can't do that
-        cls.demo_tenant_id = cls.isolated_creds.get_primary_user().get(
-            'tenantId')
+        cls.demo_tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
 
     # TODO(afazekas): Add dedicated tenant to the skiped quota tests
     # it can be moved into the setUpClass as well
diff --git a/tempest/api/network/admin/test_load_balancer_admin_actions.py b/tempest/api/network/admin/test_load_balancer_admin_actions.py
index 16238ce..fe4fc60 100644
--- a/tempest/api/network/admin/test_load_balancer_admin_actions.py
+++ b/tempest/api/network/admin/test_load_balancer_admin_actions.py
@@ -38,9 +38,7 @@
         cls.force_tenant_isolation = True
         manager = cls.get_client_manager()
         cls.client = manager.network_client
-        primary_creds = cls.isolated_creds.get_primary_creds()
-        cls.tenant_id = cls.os_adm.identity_client.get_tenant_by_name(
-            primary_creds.tenant_name)['id']
+        cls.tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
         cls.network = cls.create_network()
         cls.subnet = cls.create_subnet(cls.network)
         cls.pool = cls.create_pool(data_utils.rand_name('pool-'),
diff --git a/tempest/api/volume/admin/test_volume_quotas.py b/tempest/api/volume/admin/test_volume_quotas.py
index 2949d56..531e145 100644
--- a/tempest/api/volume/admin/test_volume_quotas.py
+++ b/tempest/api/volume/admin/test_volume_quotas.py
@@ -29,8 +29,7 @@
     def setUpClass(cls):
         super(VolumeQuotasAdminTestJSON, cls).setUpClass()
         cls.admin_volume_client = cls.os_adm.volumes_client
-        cls.demo_tenant_id = cls.isolated_creds.get_primary_user().get(
-            'tenantId')
+        cls.demo_tenant_id = cls.isolated_creds.get_primary_creds().tenant_id
 
     @test.attr(type='gate')
     def test_list_quotas(self):
diff --git a/tempest/common/rest_client.py b/tempest/common/rest_client.py
index 4f1e709..02a8c65 100644
--- a/tempest/common/rest_client.py
+++ b/tempest/common/rest_client.py
@@ -140,15 +140,19 @@
 
     @property
     def user(self):
-        return self.auth_provider.credentials.get('username', None)
+        return self.auth_provider.credentials.username
 
     @property
     def tenant_name(self):
-        return self.auth_provider.credentials.get('tenant_name', None)
+        return self.auth_provider.credentials.tenant_name
+
+    @property
+    def tenant_id(self):
+        return self.auth_provider.credentials.tenant_id
 
     @property
     def password(self):
-        return self.auth_provider.credentials.get('password', None)
+        return self.auth_provider.credentials.password
 
     @property
     def base_url(self):
diff --git a/tempest/scenario/test_security_groups_basic_ops.py b/tempest/scenario/test_security_groups_basic_ops.py
index 7670662..4616b82 100644
--- a/tempest/scenario/test_security_groups_basic_ops.py
+++ b/tempest/scenario/test_security_groups_basic_ops.py
@@ -102,11 +102,6 @@
             self.manager = clients.OfficialClientManager(credentials)
             # Credentials from manager are filled with both names and IDs
             self.creds = self.manager.credentials
-            self.keypair = None
-            self.tenant_id = credentials.tenant_id
-            self.tenant_name = credentials.tenant_name
-            self.tenant_user = credentials.username
-            self.tenant_pass = credentials.password
             self.network = None
             self.subnet = None
             self.router = None
@@ -119,12 +114,14 @@
             self.router = router
 
         def _get_tenant_credentials(self):
-            return self.tenant_user, self.tenant_pass, self.tenant_name
+            # FIXME(andreaf) Unused method
+            return self.creds
 
     @classmethod
     def check_preconditions(cls):
         super(TestSecurityGroupsBasicOps, cls).check_preconditions()
-        if (cls.alt_tenant_id is None) or (cls.tenant_id is cls.alt_tenant_id):
+        if (cls.alt_creds is None) or \
+                (cls.tenant_id is cls.alt_creds.tenant_id):
             msg = 'No alt_tenant defined'
             cls.enabled = False
             raise cls.skipException(msg)
@@ -140,7 +137,8 @@
         super(TestSecurityGroupsBasicOps, cls).setUpClass()
         cls.alt_creds = cls.alt_credentials()
         cls.alt_manager = clients.OfficialClientManager(cls.alt_creds)
-        cls.alt_tenant_id = cls.alt_manager.identity_client.tenant_id
+        # Credentials from the manager are filled with both IDs and Names
+        cls.alt_creds = cls.alt_manager.credentials
         cls.check_preconditions()
         # TODO(mnewby) Consider looking up entities as needed instead
         # of storing them as collections on the class.
@@ -150,7 +148,7 @@
         cls.primary_tenant = cls.TenantProperties(creds)
         cls.alt_tenant = cls.TenantProperties(cls.alt_creds)
         for tenant in [cls.primary_tenant, cls.alt_tenant]:
-            cls.tenants[tenant.tenant_id] = tenant
+            cls.tenants[tenant.creds.tenant_id] = tenant
         cls.floating_ip_access = not CONF.network.public_router_id
 
     def cleanup_wrapper(self, resource):
@@ -171,14 +169,14 @@
     def _create_tenant_security_groups(self, tenant):
         access_sg = self._create_empty_security_group(
             namestart='secgroup_access-',
-            tenant_id=tenant.tenant_id
+            tenant_id=tenant.creds.tenant_id
         )
         self.addCleanup(self.cleanup_wrapper, access_sg)
 
         # don't use default secgroup since it allows in-tenant traffic
         def_sg = self._create_empty_security_group(
             namestart='secgroup_general-',
-            tenant_id=tenant.tenant_id
+            tenant_id=tenant.creds.tenant_id
         )
         self.addCleanup(self.cleanup_wrapper, def_sg)
         tenant.security_groups.update(access=access_sg, default=def_sg)
@@ -235,7 +233,7 @@
             ],
             'key_name': tenant.keypair.name,
             'security_groups': security_groups,
-            'tenant_id': tenant.tenant_id
+            'tenant_id': tenant.creds.tenant_id
         }
         server = self.create_server(name=name, create_kwargs=create_kwargs)
         self.addCleanup(self.cleanup_wrapper, server)
@@ -244,7 +242,7 @@
     def _create_tenant_servers(self, tenant, num=1):
         for i in range(num):
             name = 'server-{tenant}-gen-{num}-'.format(
-                   tenant=tenant.tenant_name,
+                   tenant=tenant.creds.tenant_name,
                    num=i
             )
             name = data_utils.rand_name(name)
@@ -258,8 +256,8 @@
         workaround ip namespace
         """
         secgroups = [sg.name for sg in tenant.security_groups.values()]
-        name = 'server-{tenant}-access_point-'.format(tenant=tenant.tenant_name
-                                                      )
+        name = 'server-{tenant}-access_point-'.format(
+            tenant=tenant.creds.tenant_name)
         name = data_utils.rand_name(name)
         server = self._create_server(name, tenant,
                                      security_groups=secgroups)
@@ -273,7 +271,7 @@
         self.floating_ips.setdefault(server, floating_ip)
 
     def _create_tenant_network(self, tenant):
-        network, subnet, router = self._create_networks(tenant.tenant_id)
+        network, subnet, router = self._create_networks(tenant.creds.tenant_id)
         for r in [network, router, subnet]:
             self.addCleanup(self.cleanup_wrapper, r)
         tenant.set_network(network, subnet, router)
@@ -296,7 +294,7 @@
             tenant_id = tenant_or_id
         else:
             tenant = tenant_or_id
-            tenant_id = tenant.tenant_id
+            tenant_id = tenant.creds.tenant_id
         self._set_compute_context(tenant)
         self._create_tenant_keypairs(tenant_id)
         self._create_tenant_network(tenant)