diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 5ff6d23..990cb37 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -397,6 +397,11 @@
 # (string value)
 #uri_v3=<None>
 
+# Identity API version to be used for authentication for API
+# tests. Planned to extend to tenant isolation, scenario tests
+# and CLI tests. (string value)
+#auth_version=v2
+
 # The identity region name to use. Also used as the other
 # services' region name unless they are set explicitly. If no
 # such region is found in the service catalog, the first found
diff --git a/tempest/api/compute/base.py b/tempest/api/compute/base.py
index f8b0051..da4ccbe 100644
--- a/tempest/api/compute/base.py
+++ b/tempest/api/compute/base.py
@@ -188,7 +188,6 @@
         cls.instance_usages_audit_log_client = \
             cls.os.instance_usages_audit_log_client
         cls.hypervisor_client = cls.os.hypervisor_client
-        cls.servers_client_v3_auth = cls.os.servers_client_v3_auth
         cls.certificates_client = cls.os.certificates_client
 
     @classmethod
diff --git a/tempest/api/compute/test_authorization.py b/tempest/api/compute/test_authorization.py
index 4774fec..ed72061 100644
--- a/tempest/api/compute/test_authorization.py
+++ b/tempest/api/compute/test_authorization.py
@@ -57,7 +57,6 @@
         cls.alt_keypairs_client = cls.alt_manager.keypairs_client
         cls.alt_security_client = cls.alt_manager.security_groups_client
 
-        cls.alt_security_client._set_auth()
         resp, server = cls.create_test_server(wait_until='ACTIVE')
         resp, cls.server = cls.client.get_server(server['id'])
 
@@ -174,16 +173,14 @@
     def test_create_server_fails_when_tenant_incorrect(self):
         # A create server request should fail if the tenant id does not match
         # the current user
-        saved_base_url = self.alt_client.base_url
-        try:
-            # Change the base URL to impersonate another user
-            self.alt_client.base_url = self.client.base_url
-            self.assertRaises(exceptions.BadRequest,
-                              self.alt_client.create_server, 'test',
-                              self.image['id'], self.flavor_ref)
-        finally:
-            # Reset the base_url...
-            self.alt_client.base_url = saved_base_url
+        # Change the base URL to impersonate another user
+        self.alt_client.auth_provider.set_alt_auth_data(
+            request_part='url',
+            auth_data=self.client.auth_provider.auth_data
+        )
+        self.assertRaises(exceptions.BadRequest,
+                          self.alt_client.create_server, 'test',
+                          self.image['id'], self.flavor_ref)
 
     @attr(type='gate')
     def test_create_keypair_in_analt_user_tenant(self):
@@ -191,18 +188,18 @@
         # the current user
         # POST keypair with other user tenant
         k_name = data_utils.rand_name('keypair-')
-        self.alt_keypairs_client._set_auth()
-        self.saved_base_url = self.alt_keypairs_client.base_url
         try:
             # Change the base URL to impersonate another user
-            self.alt_keypairs_client.base_url = self.keypairs_client.base_url
+            self.alt_keypairs_client.auth_provider.set_alt_auth_data(
+                request_part='url',
+                auth_data=self.keypairs_client.auth_provider.auth_data
+            )
             resp = {}
             resp['status'] = None
             self.assertRaises(exceptions.BadRequest,
                               self.alt_keypairs_client.create_keypair, k_name)
         finally:
-            # Reset the base_url...
-            self.alt_keypairs_client.base_url = self.saved_base_url
+            # Next request the base_url is back to normal
             if (resp['status'] is not None):
                 resp, _ = self.alt_keypairs_client.delete_keypair(k_name)
                 LOG.error("Create keypair request should not happen "
@@ -242,18 +239,19 @@
         # POST security group with other user tenant
         s_name = data_utils.rand_name('security-')
         s_description = data_utils.rand_name('security')
-        self.saved_base_url = self.alt_security_client.base_url
         try:
             # Change the base URL to impersonate another user
-            self.alt_security_client.base_url = self.security_client.base_url
+            self.alt_security_client.auth_provider.set_alt_auth_data(
+                request_part='url',
+                auth_data=self.security_client.auth_provider.auth_data
+            )
             resp = {}
             resp['status'] = None
             self.assertRaises(exceptions.BadRequest,
                               self.alt_security_client.create_security_group,
                               s_name, s_description)
         finally:
-            # Reset the base_url...
-            self.alt_security_client.base_url = self.saved_base_url
+            # Next request the base_url is back to normal
             if resp['status'] is not None:
                 self.alt_security_client.delete_security_group(resp['id'])
                 LOG.error("Create Security Group request should not happen if"
@@ -282,10 +280,12 @@
         ip_protocol = 'icmp'
         from_port = -1
         to_port = -1
-        self.saved_base_url = self.alt_security_client.base_url
         try:
             # Change the base URL to impersonate another user
-            self.alt_security_client.base_url = self.security_client.base_url
+            self.alt_security_client.auth_provider.set_alt_auth_data(
+                request_part='url',
+                auth_data=self.security_client.auth_provider.auth_data
+            )
             resp = {}
             resp['status'] = None
             self.assertRaises(exceptions.BadRequest,
@@ -294,8 +294,7 @@
                               parent_group_id, ip_protocol, from_port,
                               to_port)
         finally:
-            # Reset the base_url...
-            self.alt_security_client.base_url = self.saved_base_url
+            # Next request the base_url is back to normal
             if resp['status'] is not None:
                 self.alt_security_client.delete_security_group_rule(resp['id'])
                 LOG.error("Create security group rule request should not "
diff --git a/tempest/api/identity/admin/test_roles_negative.py b/tempest/api/identity/admin/test_roles_negative.py
index e316dc7..e5c04de 100644
--- a/tempest/api/identity/admin/test_roles_negative.py
+++ b/tempest/api/identity/admin/test_roles_negative.py
@@ -41,10 +41,10 @@
     @attr(type=['negative', 'gate'])
     def test_list_roles_request_without_token(self):
         # Request to list roles without a valid token should fail
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.list_roles)
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_role_create_blank_name(self):
@@ -61,12 +61,12 @@
     @attr(type=['negative', 'gate'])
     def test_create_role_request_without_token(self):
         # Request to create role without a valid token should fail
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         role_name = data_utils.rand_name(name='role-')
         self.assertRaises(exceptions.Unauthorized,
                           self.client.create_role, role_name)
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_role_create_duplicate(self):
@@ -99,12 +99,12 @@
         self.assertEqual(200, resp.status)
         self.data.roles.append(body)
         role_id = body.get('id')
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized,
                           self.client.delete_role,
                           role_id)
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_delete_role_non_existent(self):
@@ -126,12 +126,12 @@
     def test_assign_user_role_request_without_token(self):
         # Request to assign a role to a user without a valid token
         (user, tenant, role) = self._get_role_params()
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized,
                           self.client.assign_user_role, tenant['id'],
                           user['id'], role['id'])
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_assign_user_role_for_non_existent_role(self):
@@ -176,12 +176,12 @@
         resp, user_role = self.client.assign_user_role(tenant['id'],
                                                        user['id'],
                                                        role['id'])
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized,
                           self.client.remove_user_role, tenant['id'],
                           user['id'], role['id'])
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_remove_user_role_non_existent_role(self):
@@ -219,14 +219,14 @@
     def test_list_user_roles_request_without_token(self):
         # Request to list user's roles without a valid token should fail
         (user, tenant, role) = self._get_role_params()
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         try:
             self.assertRaises(exceptions.Unauthorized,
                               self.client.list_user_roles, tenant['id'],
                               user['id'])
         finally:
-            self.client.clear_auth()
+            self.client.auth_provider.clear_auth()
 
 
 class RolesTestXML(RolesNegativeTestJSON):
diff --git a/tempest/api/identity/admin/test_tenant_negative.py b/tempest/api/identity/admin/test_tenant_negative.py
index a4d9d97..e9eddc8 100644
--- a/tempest/api/identity/admin/test_tenant_negative.py
+++ b/tempest/api/identity/admin/test_tenant_negative.py
@@ -33,10 +33,10 @@
     @attr(type=['negative', 'gate'])
     def test_list_tenant_request_without_token(self):
         # Request to list tenants without a valid token should fail
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.list_tenants)
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_tenant_delete_by_unauthorized_user(self):
@@ -55,11 +55,11 @@
         resp, tenant = self.client.create_tenant(tenant_name)
         self.assertEqual(200, resp.status)
         self.data.tenants.append(tenant)
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.delete_tenant,
                           tenant['id'])
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_delete_non_existent_tenant(self):
@@ -93,11 +93,11 @@
     def test_create_tenant_request_without_token(self):
         # Create tenant request without a token should not be authorized
         tenant_name = data_utils.rand_name(name='tenant-')
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.create_tenant,
                           tenant_name)
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_create_tenant_with_empty_name(self):
@@ -135,11 +135,11 @@
         resp, tenant = self.client.create_tenant(tenant_name)
         self.assertEqual(200, resp.status)
         self.data.tenants.append(tenant)
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.update_tenant,
                           tenant['id'])
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
 
 class TenantsNegativeTestXML(TenantsNegativeTestJSON):
diff --git a/tempest/api/identity/admin/test_tokens.py b/tempest/api/identity/admin/test_tokens.py
index cfe17fb..620e293 100644
--- a/tempest/api/identity/admin/test_tokens.py
+++ b/tempest/api/identity/admin/test_tokens.py
@@ -13,8 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import json
-
 from tempest.api.identity import base
 from tempest.common.utils import data_utils
 from tempest.test import attr
@@ -42,12 +40,11 @@
         rsp, body = self.token_client.auth(user_name,
                                            user_password,
                                            tenant['name'])
-        access_data = json.loads(body)['access']
         self.assertEqual(rsp['status'], '200')
-        self.assertEqual(access_data['token']['tenant']['name'],
+        self.assertEqual(body['token']['tenant']['name'],
                          tenant['name'])
         # then delete the token
-        token_id = access_data['token']['id']
+        token_id = body['token']['id']
         resp, body = self.client.delete_token(token_id)
         self.assertEqual(resp['status'], '204')
 
diff --git a/tempest/api/identity/admin/test_users.py b/tempest/api/identity/admin/test_users.py
index 14222fb..39ef947 100644
--- a/tempest/api/identity/admin/test_users.py
+++ b/tempest/api/identity/admin/test_users.py
@@ -115,7 +115,7 @@
         self.token_client.auth(self.data.test_user, self.data.test_password,
                                self.data.test_tenant)
         # Get the token of the current client
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         # Delete the token from database
         self.client.delete_token(token)
         # Re-auth
@@ -123,7 +123,7 @@
                                             self.data.test_password,
                                             self.data.test_tenant)
         self.assertEqual('200', resp['status'])
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type='smoke')
     def test_get_users(self):
diff --git a/tempest/api/identity/admin/test_users_negative.py b/tempest/api/identity/admin/test_users_negative.py
index ba7af09..e9e7818 100644
--- a/tempest/api/identity/admin/test_users_negative.py
+++ b/tempest/api/identity/admin/test_users_negative.py
@@ -75,7 +75,7 @@
         # Request to create a user without a valid token should fail
         self.data.setup_test_tenant()
         # Get the token of the current client
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         # Delete the token from database
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.create_user,
@@ -83,7 +83,7 @@
                           self.data.tenant['id'], self.alt_email)
 
         # Unset the token to allow further tests to generate a new token
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_create_user_with_enabled_non_bool(self):
@@ -108,14 +108,14 @@
         # Request to update a user without a valid token should fail
 
         # Get the token of the current client
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         # Delete the token from database
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.update_user,
                           self.alt_user)
 
         # Unset the token to allow further tests to generate a new token
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_update_user_by_unauthorized_user(self):
@@ -143,14 +143,14 @@
         # Request to delete a user without a valid token should fail
 
         # Get the token of the current client
-        token = self.client.get_auth()
+        token = self.client.auth_provider.get_token()
         # Delete the token from database
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.delete_user,
                           self.alt_user)
 
         # Unset the token to allow further tests to generate a new token
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_authentication_for_disabled_user(self):
@@ -207,10 +207,10 @@
     @attr(type=['negative', 'gate'])
     def test_get_users_request_without_token(self):
         # Request to get list of users without a valid token should fail
-        token = self.client.get_auth()
+        token = self.client.auth_provider.auth_data[0]
         self.client.delete_token(token)
         self.assertRaises(exceptions.Unauthorized, self.client.get_users)
-        self.client.clear_auth()
+        self.client.auth_provider.clear_auth()
 
     @attr(type=['negative', 'gate'])
     def test_list_users_with_invalid_tenant(self):
diff --git a/tempest/api/object_storage/base.py b/tempest/api/object_storage/base.py
index 0eedea1..ef36c3d 100644
--- a/tempest/api/object_storage/base.py
+++ b/tempest/api/object_storage/base.py
@@ -74,6 +74,15 @@
         cls.container_client_alt = cls.os_alt.container_client
         cls.identity_client_alt = cls.os_alt.identity_client
 
+        # Make sure we get fresh auth data after assigning swift role
+        cls.object_client.auth_provider.clear_auth()
+        cls.container_client.auth_provider.clear_auth()
+        cls.account_client.auth_provider.clear_auth()
+        cls.custom_object_client.auth_provider.clear_auth()
+        cls.custom_account_client.auth_provider.clear_auth()
+        cls.object_client_alt.auth_provider.clear_auth()
+        cls.container_client_alt.auth_provider.clear_auth()
+
         cls.data = DataGenerator(cls.identity_admin_client)
 
     @classmethod
diff --git a/tempest/api/object_storage/test_account_quotas.py b/tempest/api/object_storage/test_account_quotas.py
index cacc66e..788292d 100644
--- a/tempest/api/object_storage/test_account_quotas.py
+++ b/tempest/api/object_storage/test_account_quotas.py
@@ -62,26 +62,34 @@
             reseller_user_id,
             reseller_role_id)
 
-        # Retrieve a ResellerAdmin auth token and use it to set a quota
+        # Retrieve a ResellerAdmin auth data and use it to set a quota
         # on the client's account
-        cls.reselleradmin_token = cls.token_client.get_token(
-            cls.data.test_user,
-            cls.data.test_password,
-            cls.data.test_tenant)
+        cls.reselleradmin_auth_data = \
+            cls.os_reselleradmin.get_auth_provider().auth_data
 
     def setUp(self):
         super(AccountQuotasTest, self).setUp()
 
+        # Set the reselleradmin auth in headers for next custom_account_client
+        # request
+        self.custom_account_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.reselleradmin_auth_data
+        )
         # Set a quota of 20 bytes on the user's account before each test
-        headers = {"X-Auth-Token": self.reselleradmin_token,
-                   "X-Account-Meta-Quota-Bytes": "20"}
+        headers = {"X-Account-Meta-Quota-Bytes": "20"}
 
         self.os.custom_account_client.request("POST", "", headers, "")
 
     def tearDown(self):
+        # Set the reselleradmin auth in headers for next custom_account_client
+        # request
+        self.custom_account_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.reselleradmin_auth_data
+        )
         # remove the quota from the container
-        headers = {"X-Auth-Token": self.reselleradmin_token,
-                   "X-Remove-Account-Meta-Quota-Bytes": "x"}
+        headers = {"X-Remove-Account-Meta-Quota-Bytes": "x"}
 
         self.os.custom_account_client.request("POST", "", headers, "")
         super(AccountQuotasTest, self).tearDown()
@@ -118,8 +126,11 @@
         """
         for quota in ("25", "", "20"):
 
-            headers = {"X-Auth-Token": self.reselleradmin_token,
-                       "X-Account-Meta-Quota-Bytes": quota}
+            self.custom_account_client.auth_provider.set_alt_auth_data(
+                request_part='headers',
+                auth_data=self.reselleradmin_auth_data
+            )
+            headers = {"X-Account-Meta-Quota-Bytes": quota}
 
             resp, _ = self.os.custom_account_client.request("POST", "",
                                                             headers, "")
diff --git a/tempest/api/object_storage/test_account_quotas_negative.py b/tempest/api/object_storage/test_account_quotas_negative.py
index e35cd17..cab307d 100644
--- a/tempest/api/object_storage/test_account_quotas_negative.py
+++ b/tempest/api/object_storage/test_account_quotas_negative.py
@@ -62,26 +62,33 @@
             reseller_user_id,
             reseller_role_id)
 
-        # Retrieve a ResellerAdmin auth token and use it to set a quota
+        # Retrieve a ResellerAdmin auth data and use it to set a quota
         # on the client's account
-        cls.reselleradmin_token = cls.token_client.get_token(
-            cls.data.test_user,
-            cls.data.test_password,
-            cls.data.test_tenant)
+        cls.reselleradmin_auth_data = \
+            cls.os_reselleradmin.get_auth_provider().auth_data
 
     def setUp(self):
         super(AccountQuotasNegativeTest, self).setUp()
-
+        # Set the reselleradmin auth in headers for next custom_account_client
+        # request
+        self.custom_account_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.reselleradmin_auth_data
+        )
         # Set a quota of 20 bytes on the user's account before each test
-        headers = {"X-Auth-Token": self.reselleradmin_token,
-                   "X-Account-Meta-Quota-Bytes": "20"}
+        headers = {"X-Account-Meta-Quota-Bytes": "20"}
 
         self.os.custom_account_client.request("POST", "", headers, "")
 
     def tearDown(self):
+        # Set the reselleradmin auth in headers for next custom_account_client
+        # request
+        self.custom_account_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.reselleradmin_auth_data
+        )
         # remove the quota from the container
-        headers = {"X-Auth-Token": self.reselleradmin_token,
-                   "X-Remove-Account-Meta-Quota-Bytes": "x"}
+        headers = {"X-Remove-Account-Meta-Quota-Bytes": "x"}
 
         self.os.custom_account_client.request("POST", "", headers, "")
         super(AccountQuotasNegativeTest, self).tearDown()
diff --git a/tempest/api/object_storage/test_account_services_negative.py b/tempest/api/object_storage/test_account_services_negative.py
index c8f8096..ea93aa3 100644
--- a/tempest/api/object_storage/test_account_services_negative.py
+++ b/tempest/api/object_storage/test_account_services_negative.py
@@ -15,6 +15,7 @@
 #    under the License.
 
 from tempest.api.object_storage import base
+from tempest import clients
 from tempest import exceptions
 from tempest.test import attr
 
@@ -27,18 +28,26 @@
 
         # create user
         self.data.setup_test_user()
-        self.token_client.auth(self.data.test_user,
-                               self.data.test_password,
-                               self.data.test_tenant)
-        new_token = \
-            self.token_client.get_token(self.data.test_user,
-                                        self.data.test_password,
-                                        self.data.test_tenant)
-        custom_headers = {'X-Auth-Token': new_token}
+        test_os = clients.Manager(self.data.test_user,
+                                  self.data.test_password,
+                                  self.data.test_tenant)
+        test_auth_provider = test_os.get_auth_provider()
+        # Get auth for the test user
+        test_auth_provider.auth_data
+
+        # Get fresh auth for test user and set it to next auth request for
+        # custom_account_client
+        delattr(test_auth_provider, 'auth_data')
+        test_auth_new_data = test_auth_provider.auth_data
+        self.custom_account_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=test_auth_new_data
+        )
+
         params = {'format': 'json'}
         # list containers with non-authorized user token
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_account_client.list_account_containers,
-                          params=params, metadata=custom_headers)
+                          params=params)
         # delete the user which was created
         self.data.teardown_all()
diff --git a/tempest/api/object_storage/test_container_acl.py b/tempest/api/object_storage/test_container_acl.py
index 0733524..aae6b4d 100644
--- a/tempest/api/object_storage/test_container_acl.py
+++ b/tempest/api/object_storage/test_container_acl.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 from tempest.api.object_storage import base
+from tempest import clients
 from tempest.common.utils import data_utils
 from tempest.test import attr
 from tempest.test import HTTP_SUCCESS
@@ -24,10 +25,10 @@
     def setUpClass(cls):
         super(ObjectTestACLs, cls).setUpClass()
         cls.data.setup_test_user()
-        cls.new_token = cls.token_client.get_token(cls.data.test_user,
-                                                   cls.data.test_password,
-                                                   cls.data.test_tenant)
-        cls.custom_headers = {'X-Auth-Token': cls.new_token}
+        test_os = clients.Manager(cls.data.test_user,
+                                  cls.data.test_password,
+                                  cls.data.test_tenant)
+        cls.test_auth_data = test_os.get_auth_provider().auth_data
 
     @classmethod
     def tearDownClass(cls):
@@ -61,9 +62,12 @@
         self.assertEqual(resp['status'], '201')
         self.assertHeaders(resp, 'Object', 'PUT')
         # Trying to read the object with rights
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         resp, _ = self.custom_object_client.get_object(
-            self.container_name, object_name,
-            metadata=self.custom_headers)
+            self.container_name, object_name)
         self.assertIn(int(resp['status']), HTTP_SUCCESS)
         self.assertHeaders(resp, 'Object', 'GET')
 
@@ -79,10 +83,13 @@
         self.assertIn(int(resp_meta['status']), HTTP_SUCCESS)
         self.assertHeaders(resp_meta, 'Container', 'POST')
         # Trying to write the object with rights
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         object_name = data_utils.rand_name(name='Object')
         resp, _ = self.custom_object_client.create_object(
             self.container_name,
-            object_name, 'data',
-            metadata=self.custom_headers)
+            object_name, 'data')
         self.assertIn(int(resp['status']), HTTP_SUCCESS)
         self.assertHeaders(resp, 'Object', 'PUT')
diff --git a/tempest/api/object_storage/test_container_acl_negative.py b/tempest/api/object_storage/test_container_acl_negative.py
index f8f29de..1dc9bb5 100644
--- a/tempest/api/object_storage/test_container_acl_negative.py
+++ b/tempest/api/object_storage/test_container_acl_negative.py
@@ -15,6 +15,7 @@
 #    under the License.
 
 from tempest.api.object_storage import base
+from tempest import clients
 from tempest.common.utils import data_utils
 from tempest import exceptions
 from tempest.test import attr
@@ -26,10 +27,10 @@
     def setUpClass(cls):
         super(ObjectACLsNegativeTest, cls).setUpClass()
         cls.data.setup_test_user()
-        cls.new_token = cls.token_client.get_token(cls.data.test_user,
-                                                   cls.data.test_password,
-                                                   cls.data.test_tenant)
-        cls.custom_headers = {'X-Auth-Token': cls.new_token}
+        test_os = clients.Manager(cls.data.test_user,
+                                  cls.data.test_password,
+                                  cls.data.test_tenant)
+        cls.test_auth_data = test_os.get_auth_provider().auth_data
 
     @classmethod
     def tearDownClass(cls):
@@ -50,6 +51,10 @@
         # trying to create object with empty headers
         # X-Auth-Token is not provided
         object_name = data_utils.rand_name(name='Object')
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=None
+        )
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.create_object,
                           self.container_name, object_name, 'data')
@@ -62,6 +67,10 @@
                                                    object_name, 'data')
         # trying to delete object with empty headers
         # X-Auth-Token is not provided
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=None
+        )
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.delete_object,
                           self.container_name, object_name)
@@ -72,10 +81,13 @@
         # User provided token is forbidden. ACL are not set
         object_name = data_utils.rand_name(name='Object')
         # trying to create object with non-authorized user
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.create_object,
-                          self.container_name, object_name, 'data',
-                          metadata=self.custom_headers)
+                          self.container_name, object_name, 'data')
 
     @attr(type=['negative', 'gate'])
     def test_read_object_with_non_authorized_user(self):
@@ -87,10 +99,13 @@
         self.assertEqual(resp['status'], '201')
         self.assertHeaders(resp, 'Object', 'PUT')
         # trying to get object with non authorized user token
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.get_object,
-                          self.container_name, object_name,
-                          metadata=self.custom_headers)
+                          self.container_name, object_name)
 
     @attr(type=['negative', 'gate'])
     def test_delete_object_with_non_authorized_user(self):
@@ -102,10 +117,13 @@
         self.assertEqual(resp['status'], '201')
         self.assertHeaders(resp, 'Object', 'PUT')
         # trying to delete object with non-authorized user token
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.delete_object,
-                          self.container_name, object_name,
-                          metadata=self.custom_headers)
+                          self.container_name, object_name)
 
     @attr(type=['negative', 'smoke'])
     def test_read_object_without_rights(self):
@@ -124,10 +142,13 @@
         self.assertEqual(resp['status'], '201')
         self.assertHeaders(resp, 'Object', 'PUT')
         # Trying to read the object without rights
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.get_object,
-                          self.container_name, object_name,
-                          metadata=self.custom_headers)
+                          self.container_name, object_name)
 
     @attr(type=['negative', 'smoke'])
     def test_write_object_without_rights(self):
@@ -140,12 +161,15 @@
         self.assertIn(int(resp_meta['status']), HTTP_SUCCESS)
         self.assertHeaders(resp_meta, 'Container', 'POST')
         # Trying to write the object without rights
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         object_name = data_utils.rand_name(name='Object')
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.create_object,
                           self.container_name,
-                          object_name, 'data',
-                          metadata=self.custom_headers)
+                          object_name, 'data')
 
     @attr(type=['negative', 'smoke'])
     def test_write_object_without_write_rights(self):
@@ -160,12 +184,15 @@
         self.assertIn(int(resp_meta['status']), HTTP_SUCCESS)
         self.assertHeaders(resp_meta, 'Container', 'POST')
         # Trying to write the object without write rights
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         object_name = data_utils.rand_name(name='Object')
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.create_object,
                           self.container_name,
-                          object_name, 'data',
-                          metadata=self.custom_headers)
+                          object_name, 'data')
 
     @attr(type=['negative', 'smoke'])
     def test_delete_object_without_write_rights(self):
@@ -186,8 +213,11 @@
         self.assertEqual(resp['status'], '201')
         self.assertHeaders(resp, 'Object', 'PUT')
         # Trying to delete the object without write rights
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=self.test_auth_data
+        )
         self.assertRaises(exceptions.Unauthorized,
                           self.custom_object_client.delete_object,
                           self.container_name,
-                          object_name,
-                          metadata=self.custom_headers)
+                          object_name)
diff --git a/tempest/api/object_storage/test_container_staticweb.py b/tempest/api/object_storage/test_container_staticweb.py
index 9f9abd8..197e7fa 100644
--- a/tempest/api/object_storage/test_container_staticweb.py
+++ b/tempest/api/object_storage/test_container_staticweb.py
@@ -56,6 +56,12 @@
         self.container_client.update_container_metadata(
             self.container_name, metadata=headers)
 
+        # Maintain original headers, no auth added
+        self.custom_account_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=None
+        )
+
         # test GET on http://account_url/container_name
         # we should retrieve the self.object_name file
         resp, body = self.custom_account_client.request("GET",
@@ -112,6 +118,12 @@
         self.container_client.update_container_metadata(
             self.container_name, metadata=headers)
 
+        # Maintain original headers, no auth added
+        self.custom_account_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=None
+        )
+
         # test GET on http://account_url/container_name
         # we should retrieve a listing of objects
         resp, body = self.custom_account_client.request("GET",
@@ -136,6 +148,12 @@
                                          object_name_404,
                                          object_data_404)
 
+        # Do not set auth in HTTP headers for next request
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=None
+        )
+
         # Request non-existing object
         resp, body = self.custom_object_client.get_object(self.container_name,
                                                           "notexisting")
diff --git a/tempest/api/object_storage/test_crossdomain.py b/tempest/api/object_storage/test_crossdomain.py
index 71e123c..4f399b4 100644
--- a/tempest/api/object_storage/test_crossdomain.py
+++ b/tempest/api/object_storage/test_crossdomain.py
@@ -50,13 +50,12 @@
         super(CrossdomainTest, self).setUp()
 
         client = self.os_test_user.account_client
-        client._set_auth()
         # Turning http://.../v1/foobar into http://.../
-        client.base_url = "/".join(client.base_url.split("/")[:-2])
+        client.skip_path()
 
     def tearDown(self):
         # clear the base_url for subsequent requests
-        self.os_test_user.account_client.base_url = None
+        self.os_test_user.account_client.reset_path()
 
         super(CrossdomainTest, self).tearDown()
 
diff --git a/tempest/api/object_storage/test_healthcheck.py b/tempest/api/object_storage/test_healthcheck.py
index 78bff03..35aee2a 100644
--- a/tempest/api/object_storage/test_healthcheck.py
+++ b/tempest/api/object_storage/test_healthcheck.py
@@ -29,10 +29,8 @@
 
     def setUp(self):
         super(HealthcheckTest, self).setUp()
-        self.account_client._set_auth()
         # Turning http://.../v1/foobar into http://.../
-        self.account_client.base_url = "/".join(
-            self.account_client.base_url.split("/")[:-2])
+        self.account_client.skip_path()
 
     @attr('gate')
     def test_get_healthcheck(self):
diff --git a/tempest/api/object_storage/test_object_services.py b/tempest/api/object_storage/test_object_services.py
index bca9b93..6f349b6 100644
--- a/tempest/api/object_storage/test_object_services.py
+++ b/tempest/api/object_storage/test_object_services.py
@@ -357,8 +357,12 @@
         self.assertEqual(resp_meta['x-container-read'], '.r:*,.rlistings')
 
         # trying to get object with empty headers as it is public readable
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=None
+        )
         resp, body = self.custom_object_client.get_object(
-            self.container_name, object_name, metadata={})
+            self.container_name, object_name)
         self.assertHeaders(resp, 'Object', 'GET')
 
         self.assertEqual(body, data)
@@ -393,12 +397,14 @@
         self.assertEqual(resp['x-container-read'], '.r:*,.rlistings')
 
         # get auth token of alternative user
-        token = self.identity_client_alt.get_auth()
-        headers = {'X-Auth-Token': token}
+        alt_auth_data = self.identity_client_alt.auth_provider.auth_data
+        self.custom_object_client.auth_provider.set_alt_auth_data(
+            request_part='headers',
+            auth_data=alt_auth_data
+        )
         # access object using alternate user creds
         resp, body = self.custom_object_client.get_object(
-            self.container_name, object_name,
-            metadata=headers)
+            self.container_name, object_name)
         self.assertHeaders(resp, 'Object', 'GET')
 
         self.assertEqual(body, data)
diff --git a/tempest/auth.py b/tempest/auth.py
new file mode 100644
index 0000000..8d826cf
--- /dev/null
+++ b/tempest/auth.py
@@ -0,0 +1,413 @@
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import copy
+import exceptions
+import re
+import urlparse
+
+from datetime import datetime
+from tempest import config
+from tempest.services.identity.json import identity_client as json_id
+from tempest.services.identity.v3.json import identity_client as json_v3id
+from tempest.services.identity.v3.xml import identity_client as xml_v3id
+from tempest.services.identity.xml import identity_client as xml_id
+
+from tempest.openstack.common import log as logging
+
+CONF = config.CONF
+LOG = logging.getLogger(__name__)
+
+
+class AuthProvider(object):
+    """
+    Provide authentication
+    """
+
+    def __init__(self, credentials, client_type='tempest',
+                 interface=None):
+        """
+        :param credentials: credentials for authentication
+        :param client_type: 'tempest' or 'official'
+        :param interface: 'json' or 'xml'. Applicable for tempest client only
+        """
+        if self.check_credentials(credentials):
+            self.credentials = credentials
+        else:
+            raise TypeError("Invalid credentials")
+        self.credentials = credentials
+        self.client_type = client_type
+        self.interface = interface
+        if self.client_type == 'tempest' and self.interface is None:
+            self.interface = 'json'
+        self.cache = None
+        self.alt_auth_data = None
+        self.alt_part = None
+
+    def __str__(self):
+        return "Creds :{creds}, client type: {client_type}, interface: " \
+               "{interface}, cached auth data: {cache}".format(
+                   creds=self.credentials, client_type=self.client_type,
+                   interface=self.interface, cache=self.cache
+               )
+
+    def _decorate_request(self, filters, method, url, headers=None, body=None,
+                          auth_data=None):
+        """
+        Decorate request with authentication data
+        """
+        raise NotImplemented
+
+    def _get_auth(self):
+        raise NotImplemented
+
+    @classmethod
+    def check_credentials(cls, credentials):
+        """
+        Verify credentials are valid. Subclasses can do a better check.
+        """
+        return isinstance(credentials, dict)
+
+    @property
+    def auth_data(self):
+        if self.cache is None or self.is_expired(self.cache):
+            self.cache = self._get_auth()
+        return self.cache
+
+    @auth_data.deleter
+    def auth_data(self):
+        self.clear_auth()
+
+    def clear_auth(self):
+        """
+        Can be called to clear the access cache so that next request
+        will fetch a new token and base_url.
+        """
+        self.cache = None
+
+    def is_expired(self, auth_data):
+        raise NotImplemented
+
+    def auth_request(self, method, url, headers=None, body=None, filters=None):
+        """
+        Obtains auth data and decorates a request with that.
+        :param method: HTTP method of the request
+        :param url: relative URL of the request (path)
+        :param headers: HTTP headers of the request
+        :param body: HTTP body in case of POST / PUT
+        :param filters: select a base URL out of the catalog
+        :returns a Tuple (url, headers, body)
+        """
+        LOG.debug("Auth request m:{m}, u:{u}, h:{h}, b:{b}, f:{f}".format(
+            m=method, u=url, h=headers, b=body, f=filters
+        ))
+        orig_req = dict(url=url, headers=headers, body=body)
+
+        auth_url, auth_headers, auth_body = self._decorate_request(
+            filters, method, url, headers, body)
+        auth_req = dict(url=auth_url, headers=auth_headers, body=auth_body)
+
+        # Overwrite part if the request if it has been requested
+        if self.alt_part is not None:
+            if self.alt_auth_data is not None:
+                alt_url, alt_headers, alt_body = self._decorate_request(
+                    filters, method, url, headers, body,
+                    auth_data=self.alt_auth_data)
+                alt_auth_req = dict(url=alt_url, headers=alt_headers,
+                                    body=alt_body)
+                self._log_auth_request(alt_auth_req, 'ALTERNATE')
+                auth_req[self.alt_part] = alt_auth_req[self.alt_part]
+
+            else:
+                # If alt auth data is None, skip auth in the requested part
+                auth_req[self.alt_part] = orig_req[self.alt_part]
+
+            # Next auth request will be normal, unless otherwise requested
+            self.reset_alt_auth_data()
+
+        self._log_auth_request(auth_req, 'Authorized Request:')
+
+        return auth_req['url'], auth_req['headers'], auth_req['body']
+
+    def _log_auth_request(self, auth_req, tag):
+        url = auth_req.get('url', None)
+        headers = copy.deepcopy(auth_req.get('headers', None))
+        body = auth_req.get('body', None)
+        if headers is not None:
+            if 'X-Auth-Token' in headers.keys():
+                headers['X-Auth-Token'] = '<Token Omitted>'
+        LOG.debug("[{tag}]: u: {url}, h: {headers}, b: {body}".format(
+            tag=tag, url=url, headers=headers, body=body
+        ))
+
+    def reset_alt_auth_data(self):
+        """
+        Configure auth provider to provide valid authentication data
+        """
+        self.alt_part = None
+        self.alt_auth_data = None
+
+    def set_alt_auth_data(self, request_part, auth_data):
+        """
+        Configure auth provider to provide alt authentication data
+        on a part of the *next* auth_request. If credentials are None,
+        set invalid data.
+        :param request_part: request part to contain invalid auth: url,
+                             headers, body
+        :param auth_data: alternative auth_data from which to get the
+                          invalid data to be injected
+        """
+        self.alt_part = request_part
+        self.alt_auth_data = auth_data
+
+    def base_url(self, filters, auth_data=None):
+        """
+        Extracts the base_url based on provided filters
+        """
+        raise NotImplemented
+
+
+class KeystoneAuthProvider(AuthProvider):
+
+    def __init__(self, credentials, client_type='tempest', interface=None):
+        super(KeystoneAuthProvider, self).__init__(credentials, client_type,
+                                                   interface)
+        self.auth_client = self._auth_client()
+
+    def _decorate_request(self, filters, method, url, headers=None, body=None,
+                          auth_data=None):
+        if auth_data is None:
+            auth_data = self.auth_data
+        token, _ = auth_data
+        base_url = self.base_url(filters=filters, auth_data=auth_data)
+        # build authenticated request
+        # returns new request, it does not touch the original values
+        _headers = copy.deepcopy(headers)
+        _headers['X-Auth-Token'] = token
+        if url is None or url == "":
+            _url = base_url
+        else:
+            # Join base URL and url, and remove multiple contiguous slashes
+            _url = "/".join([base_url, url])
+            parts = [x for x in urlparse.urlparse(_url)]
+            parts[2] = re.sub("/{2,}", "/", parts[2])
+            _url = urlparse.urlunparse(parts)
+        # no change to method or body
+        return _url, _headers, body
+
+    def _auth_client(self):
+        raise NotImplemented
+
+    def _auth_params(self):
+        raise NotImplemented
+
+    def _get_auth(self):
+        # Bypasses the cache
+        if self.client_type == 'tempest':
+            auth_func = getattr(self.auth_client, 'get_token')
+            auth_params = self._auth_params()
+
+            # returns token, auth_data
+            token, auth_data = auth_func(**auth_params)
+            return token, auth_data
+        else:
+            raise NotImplemented
+
+    def get_token(self):
+        return self.auth_data[0]
+
+
+class KeystoneV2AuthProvider(KeystoneAuthProvider):
+
+    EXPIRY_DATE_FORMAT = '%Y-%m-%dT%H:%M:%SZ'
+
+    @classmethod
+    def check_credentials(cls, credentials, scoped=True):
+        # tenant_name is optional if not scoped
+        valid = super(KeystoneV2AuthProvider, cls).check_credentials(
+            credentials) and 'username' in credentials and \
+            'password' in credentials
+        if scoped:
+            valid = valid and 'tenant_name' in credentials
+        return valid
+
+    def _auth_client(self):
+        if self.client_type == 'tempest':
+            if self.interface == 'json':
+                return json_id.TokenClientJSON()
+            else:
+                return xml_id.TokenClientXML()
+        else:
+            raise NotImplemented
+
+    def _auth_params(self):
+        if self.client_type == 'tempest':
+            return dict(
+                user=self.credentials['username'],
+                password=self.credentials['password'],
+                tenant=self.credentials.get('tenant_name', None),
+                auth_data=True)
+        else:
+            raise NotImplemented
+
+    def base_url(self, filters, auth_data=None):
+        """
+        Filters can be:
+        - service: compute, image, etc
+        - region: the service region
+        - endpoint_type: adminURL, publicURL, internalURL
+        - api_version: replace catalog version with this
+        - skip_path: take just the base URL
+        """
+        if auth_data is None:
+            auth_data = self.auth_data
+        token, _auth_data = auth_data
+        service = filters.get('service')
+        region = filters.get('region')
+        endpoint_type = filters.get('endpoint_type', 'publicURL')
+
+        if service is None:
+            raise exceptions.EndpointNotFound("No service provided")
+
+        _base_url = None
+        for ep in _auth_data['serviceCatalog']:
+            if ep["type"] == service:
+                for _ep in ep['endpoints']:
+                    if region is not None and _ep['region'] == region:
+                        _base_url = _ep.get(endpoint_type)
+                if not _base_url:
+                    # No region matching, use the first
+                    _base_url = ep['endpoints'][0].get(endpoint_type)
+                break
+        if _base_url is None:
+            raise exceptions.EndpointNotFound(service)
+
+        parts = urlparse.urlparse(_base_url)
+        if filters.get('api_version', None) is not None:
+            path = "/" + filters['api_version']
+            noversion_path = "/".join(parts.path.split("/")[2:])
+            if noversion_path != "":
+                path += noversion_path
+            _base_url = _base_url.replace(parts.path, path)
+        if filters.get('skip_path', None) is not None:
+            _base_url = _base_url.replace(parts.path, "/")
+
+        return _base_url
+
+    def is_expired(self, auth_data):
+        _, access = auth_data
+        expiry = datetime.strptime(access['token']['expires'],
+                                   self.EXPIRY_DATE_FORMAT)
+        return expiry <= datetime.now()
+
+
+class KeystoneV3AuthProvider(KeystoneAuthProvider):
+
+    EXPIRY_DATE_FORMAT = '%Y-%m-%dT%H:%M:%S.%fZ'
+
+    @classmethod
+    def check_credentials(cls, credentials, scoped=True):
+        # tenant_name is optional if not scoped
+        valid = super(KeystoneV3AuthProvider, cls).check_credentials(
+            credentials) and 'username' in credentials and \
+            'password' in credentials and 'domain_name' in credentials
+        if scoped:
+            valid = valid and 'tenant_name' in credentials
+        return valid
+
+    def _auth_client(self):
+        if self.client_type == 'tempest':
+            if self.interface == 'json':
+                return json_v3id.V3TokenClientJSON()
+            else:
+                return xml_v3id.V3TokenClientXML()
+        else:
+            raise NotImplemented
+
+    def _auth_params(self):
+        if self.client_type == 'tempest':
+            return dict(
+                user=self.credentials['username'],
+                password=self.credentials['password'],
+                tenant=self.credentials.get('tenant_name', None),
+                domain=self.credentials['domain_name'],
+                auth_data=True)
+        else:
+            raise NotImplemented
+
+    def base_url(self, filters, auth_data=None):
+        """
+        Filters can be:
+        - service: compute, image, etc
+        - region: the service region
+        - endpoint_type: adminURL, publicURL, internalURL
+        - api_version: replace catalog version with this
+        - skip_path: take just the base URL
+        """
+        if auth_data is None:
+            auth_data = self.auth_data
+        token, _auth_data = auth_data
+        service = filters.get('service')
+        region = filters.get('region')
+        endpoint_type = filters.get('endpoint_type', 'public')
+
+        if service is None:
+            raise exceptions.EndpointNotFound("No service provided")
+
+        if 'URL' in endpoint_type:
+            endpoint_type = endpoint_type.replace('URL', '')
+        _base_url = None
+        catalog = _auth_data['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)
+        # Filter by endpoint type (interface)
+        filtered_catalog = [ep for ep in service_catalog if
+                            ep['interface'] == endpoint_type]
+        if len(filtered_catalog) == 0:
+            # No matching type, keep all and try matching by region at least
+            filtered_catalog = service_catalog
+        # Filter by region
+        filtered_catalog = [ep for ep in filtered_catalog if
+                            ep['region'] == region]
+        if len(filtered_catalog) == 0:
+            # No matching region, take the first endpoint
+            filtered_catalog = [filtered_catalog[0]]
+        # 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)
+
+        parts = urlparse.urlparse(_base_url)
+        if filters.get('api_version', None) is not None:
+            path = "/" + filters['api_version']
+            noversion_path = "/".join(parts.path.split("/")[2:])
+            if noversion_path != "":
+                path += noversion_path
+            _base_url = _base_url.replace(parts.path, path)
+        if filters.get('skip_path', None) is not None:
+            _base_url = _base_url.replace(parts.path, "/")
+
+        return _base_url
+
+    def is_expired(self, auth_data):
+        _, access = auth_data
+        expiry = datetime.strptime(access['expires_at'],
+                                   self.EXPIRY_DATE_FORMAT)
+        return expiry <= datetime.now()
diff --git a/tempest/clients.py b/tempest/clients.py
index f8361af..fd46656 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -13,6 +13,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from tempest import auth
 from tempest.common.rest_client import NegativeRestClient
 from tempest import config
 from tempest import exceptions
@@ -185,172 +186,208 @@
         :param password: Override of the password
         :param tenant_name: Override of the tenant name
         """
-        # If no creds are provided, we fall back on the defaults
-        # in the config file for the Compute API.
-        self.username = username or CONF.identity.username
-        self.password = password or CONF.identity.password
-        self.tenant_name = tenant_name or CONF.identity.tenant_name
-
-        if None in (self.username, self.password, self.tenant_name):
-            msg = ("Missing required credentials. "
-                   "username: %(u)s, password: %(p)s, "
-                   "tenant_name: %(t)s" %
-                   {'u': username, 'p': password, 't': tenant_name})
-            raise exceptions.InvalidConfiguration(msg)
-
-        self.auth_url = CONF.identity.uri
-        self.auth_url_v3 = CONF.identity.uri_v3
-
-        client_args = (self.username, self.password,
-                       self.auth_url, self.tenant_name)
-
-        if self.auth_url_v3:
-            auth_version = 'v3'
-            client_args_v3_auth = (self.username,
-                                   self.password, self.auth_url_v3,
-                                   self.tenant_name, auth_version)
+        self.interface = interface
+        self.auth_version = CONF.identity.auth_version
+        # FIXME(andreaf) Change Manager __init__ to accept a credentials dict
+        if username is None or password is None:
+            # Tenant None is a valid use case
+            self.credentials = self.get_default_credentials()
         else:
-            client_args_v3_auth = None
+            self.credentials = dict(username=username, password=password,
+                                    tenant_name=tenant_name)
+        if self.auth_version == 'v3':
+            self.credentials['domain_name'] = 'Default'
+        # Setup an auth provider
+        auth_provider = self.get_auth_provider(self.credentials)
 
-        self.servers_client_v3_auth = None
-
-        if interface == 'xml':
-            self.certificates_client = CertificatesClientXML(*client_args)
-            self.servers_client = ServersClientXML(*client_args)
-            self.limits_client = LimitsClientXML(*client_args)
-            self.images_client = ImagesClientXML(*client_args)
-            self.keypairs_client = KeyPairsClientXML(*client_args)
-            self.quotas_client = QuotasClientXML(*client_args)
-            self.flavors_client = FlavorsClientXML(*client_args)
-            self.extensions_client = ExtensionsClientXML(*client_args)
+        if self.interface == 'xml':
+            self.certificates_client = CertificatesClientXML(
+                auth_provider)
+            self.servers_client = ServersClientXML(auth_provider)
+            self.limits_client = LimitsClientXML(auth_provider)
+            self.images_client = ImagesClientXML(auth_provider)
+            self.keypairs_client = KeyPairsClientXML(auth_provider)
+            self.quotas_client = QuotasClientXML(auth_provider)
+            self.flavors_client = FlavorsClientXML(auth_provider)
+            self.extensions_client = ExtensionsClientXML(auth_provider)
             self.volumes_extensions_client = VolumesExtensionsClientXML(
-                *client_args)
-            self.floating_ips_client = FloatingIPsClientXML(*client_args)
-            self.snapshots_client = SnapshotsClientXML(*client_args)
-            self.volumes_client = VolumesClientXML(*client_args)
-            self.volume_types_client = VolumeTypesClientXML(*client_args)
-            self.identity_client = IdentityClientXML(*client_args)
-            self.identity_v3_client = IdentityV3ClientXML(*client_args)
-            self.token_client = TokenClientXML()
+                auth_provider)
+            self.floating_ips_client = FloatingIPsClientXML(
+                auth_provider)
+            self.snapshots_client = SnapshotsClientXML(auth_provider)
+            self.volumes_client = VolumesClientXML(auth_provider)
+            self.volume_types_client = VolumeTypesClientXML(
+                auth_provider)
+            self.identity_client = IdentityClientXML(auth_provider)
+            self.identity_v3_client = IdentityV3ClientXML(
+                auth_provider)
             self.security_groups_client = SecurityGroupsClientXML(
-                *client_args)
-            self.interfaces_client = InterfacesClientXML(*client_args)
-            self.endpoints_client = EndPointClientXML(*client_args)
-            self.fixed_ips_client = FixedIPsClientXML(*client_args)
+                auth_provider)
+            self.interfaces_client = InterfacesClientXML(auth_provider)
+            self.endpoints_client = EndPointClientXML(auth_provider)
+            self.fixed_ips_client = FixedIPsClientXML(auth_provider)
             self.availability_zone_client = AvailabilityZoneClientXML(
-                *client_args)
-            self.service_client = ServiceClientXML(*client_args)
-            self.aggregates_client = AggregatesClientXML(*client_args)
-            self.services_client = ServicesClientXML(*client_args)
-            self.tenant_usages_client = TenantUsagesClientXML(*client_args)
-            self.policy_client = PolicyClientXML(*client_args)
-            self.hosts_client = HostsClientXML(*client_args)
-            self.hypervisor_client = HypervisorClientXML(*client_args)
-            self.token_v3_client = V3TokenClientXML(*client_args)
-            self.network_client = NetworkClientXML(*client_args)
-            self.credentials_client = CredentialsClientXML(*client_args)
+                auth_provider)
+            self.service_client = ServiceClientXML(auth_provider)
+            self.aggregates_client = AggregatesClientXML(auth_provider)
+            self.services_client = ServicesClientXML(auth_provider)
+            self.tenant_usages_client = TenantUsagesClientXML(
+                auth_provider)
+            self.policy_client = PolicyClientXML(auth_provider)
+            self.hosts_client = HostsClientXML(auth_provider)
+            self.hypervisor_client = HypervisorClientXML(auth_provider)
+            self.network_client = NetworkClientXML(auth_provider)
+            self.credentials_client = CredentialsClientXML(
+                auth_provider)
             self.instance_usages_audit_log_client = \
-                InstanceUsagesAuditLogClientXML(*client_args)
-            self.volume_hosts_client = VolumeHostsClientXML(*client_args)
+                InstanceUsagesAuditLogClientXML(auth_provider)
+            self.volume_hosts_client = VolumeHostsClientXML(
+                auth_provider)
             self.volumes_extension_client = VolumeExtensionClientXML(
-                *client_args)
-
-            if client_args_v3_auth:
-                self.servers_client_v3_auth = ServersClientXML(
-                    *client_args_v3_auth)
+                auth_provider)
             if CONF.service_available.ceilometer:
-                self.telemetry_client = TelemetryClientXML(*client_args)
+                self.telemetry_client = TelemetryClientXML(
+                    auth_provider)
+            self.token_client = TokenClientXML()
+            self.token_v3_client = V3TokenClientXML()
 
-        elif interface == 'json':
-            self.certificates_client = CertificatesClientJSON(*client_args)
+        elif self.interface == 'json':
+            self.certificates_client = CertificatesClientJSON(
+                auth_provider)
             self.certificates_v3_client = CertificatesV3ClientJSON(
-                *client_args)
-            self.baremetal_client = BaremetalClientJSON(*client_args)
-            self.servers_client = ServersClientJSON(*client_args)
-            self.servers_v3_client = ServersV3ClientJSON(*client_args)
-            self.limits_client = LimitsClientJSON(*client_args)
-            self.images_client = ImagesClientJSON(*client_args)
-            self.keypairs_v3_client = KeyPairsV3ClientJSON(*client_args)
-            self.keypairs_client = KeyPairsClientJSON(*client_args)
-            self.keypairs_v3_client = KeyPairsV3ClientJSON(*client_args)
-            self.quotas_client = QuotasClientJSON(*client_args)
-            self.quotas_v3_client = QuotasV3ClientJSON(*client_args)
-            self.flavors_client = FlavorsClientJSON(*client_args)
-            self.flavors_v3_client = FlavorsV3ClientJSON(*client_args)
-            self.extensions_v3_client = ExtensionsV3ClientJSON(*client_args)
-            self.extensions_client = ExtensionsClientJSON(*client_args)
+                auth_provider)
+            self.baremetal_client = BaremetalClientJSON(auth_provider)
+            self.servers_client = ServersClientJSON(auth_provider)
+            self.servers_v3_client = ServersV3ClientJSON(auth_provider)
+            self.limits_client = LimitsClientJSON(auth_provider)
+            self.images_client = ImagesClientJSON(auth_provider)
+            self.keypairs_v3_client = KeyPairsV3ClientJSON(
+                auth_provider)
+            self.keypairs_client = KeyPairsClientJSON(auth_provider)
+            self.keypairs_v3_client = KeyPairsV3ClientJSON(
+                auth_provider)
+            self.quotas_client = QuotasClientJSON(auth_provider)
+            self.quotas_v3_client = QuotasV3ClientJSON(auth_provider)
+            self.flavors_client = FlavorsClientJSON(auth_provider)
+            self.flavors_v3_client = FlavorsV3ClientJSON(auth_provider)
+            self.extensions_v3_client = ExtensionsV3ClientJSON(
+                auth_provider)
+            self.extensions_client = ExtensionsClientJSON(
+                auth_provider)
             self.volumes_extensions_client = VolumesExtensionsClientJSON(
-                *client_args)
-            self.floating_ips_client = FloatingIPsClientJSON(*client_args)
-            self.snapshots_client = SnapshotsClientJSON(*client_args)
-            self.volumes_client = VolumesClientJSON(*client_args)
-            self.volume_types_client = VolumeTypesClientJSON(*client_args)
-            self.identity_client = IdentityClientJSON(*client_args)
-            self.identity_v3_client = IdentityV3ClientJSON(*client_args)
-            self.token_client = TokenClientJSON()
+                auth_provider)
+            self.floating_ips_client = FloatingIPsClientJSON(
+                auth_provider)
+            self.snapshots_client = SnapshotsClientJSON(auth_provider)
+            self.volumes_client = VolumesClientJSON(auth_provider)
+            self.volume_types_client = VolumeTypesClientJSON(
+                auth_provider)
+            self.identity_client = IdentityClientJSON(auth_provider)
+            self.identity_v3_client = IdentityV3ClientJSON(
+                auth_provider)
             self.security_groups_client = SecurityGroupsClientJSON(
-                *client_args)
-            self.interfaces_v3_client = InterfacesV3ClientJSON(*client_args)
-            self.interfaces_client = InterfacesClientJSON(*client_args)
-            self.endpoints_client = EndPointClientJSON(*client_args)
-            self.fixed_ips_client = FixedIPsClientJSON(*client_args)
+                auth_provider)
+            self.interfaces_v3_client = InterfacesV3ClientJSON(
+                auth_provider)
+            self.interfaces_client = InterfacesClientJSON(
+                auth_provider)
+            self.endpoints_client = EndPointClientJSON(auth_provider)
+            self.fixed_ips_client = FixedIPsClientJSON(auth_provider)
             self.availability_zone_v3_client = AvailabilityZoneV3ClientJSON(
-                *client_args)
+                auth_provider)
             self.availability_zone_client = AvailabilityZoneClientJSON(
-                *client_args)
-            self.services_v3_client = ServicesV3ClientJSON(*client_args)
-            self.service_client = ServiceClientJSON(*client_args)
-            self.aggregates_v3_client = AggregatesV3ClientJSON(*client_args)
-            self.aggregates_client = AggregatesClientJSON(*client_args)
-            self.services_client = ServicesClientJSON(*client_args)
+                auth_provider)
+            self.services_v3_client = ServicesV3ClientJSON(
+                auth_provider)
+            self.service_client = ServiceClientJSON(auth_provider)
+            self.aggregates_v3_client = AggregatesV3ClientJSON(
+                auth_provider)
+            self.aggregates_client = AggregatesClientJSON(
+                auth_provider)
+            self.services_client = ServicesClientJSON(auth_provider)
             self.tenant_usages_v3_client = TenantUsagesV3ClientJSON(
-                *client_args)
-            self.tenant_usages_client = TenantUsagesClientJSON(*client_args)
-            self.version_v3_client = VersionV3ClientJSON(*client_args)
-            self.policy_client = PolicyClientJSON(*client_args)
-            self.hosts_client = HostsClientJSON(*client_args)
-            self.hypervisor_v3_client = HypervisorV3ClientJSON(*client_args)
-            self.hypervisor_client = HypervisorClientJSON(*client_args)
-            self.token_v3_client = V3TokenClientJSON(*client_args)
-            self.network_client = NetworkClientJSON(*client_args)
-            self.credentials_client = CredentialsClientJSON(*client_args)
+                auth_provider)
+            self.tenant_usages_client = TenantUsagesClientJSON(
+                auth_provider)
+            self.version_v3_client = VersionV3ClientJSON(auth_provider)
+            self.policy_client = PolicyClientJSON(auth_provider)
+            self.hosts_client = HostsClientJSON(auth_provider)
+            self.hypervisor_v3_client = HypervisorV3ClientJSON(
+                auth_provider)
+            self.hypervisor_client = HypervisorClientJSON(
+                auth_provider)
+            self.network_client = NetworkClientJSON(auth_provider)
+            self.credentials_client = CredentialsClientJSON(
+                auth_provider)
             self.instance_usages_audit_log_client = \
-                InstanceUsagesAuditLogClientJSON(*client_args)
+                InstanceUsagesAuditLogClientJSON(auth_provider)
             self.instance_usages_audit_log_v3_client = \
-                InstanceUsagesAuditLogV3ClientJSON(*client_args)
-            self.volume_hosts_client = VolumeHostsClientJSON(*client_args)
+                InstanceUsagesAuditLogV3ClientJSON(auth_provider)
+            self.volume_hosts_client = VolumeHostsClientJSON(
+                auth_provider)
             self.volumes_extension_client = VolumeExtensionClientJSON(
-                *client_args)
-            self.hosts_v3_client = HostsV3ClientJSON(*client_args)
+                auth_provider)
+            self.hosts_v3_client = HostsV3ClientJSON(auth_provider)
             if CONF.service_available.ceilometer:
-                self.telemetry_client = TelemetryClientJSON(*client_args)
-            self.negative_client = NegativeRestClient(*client_args)
+                self.telemetry_client = TelemetryClientJSON(
+                    auth_provider)
+            self.token_client = TokenClientJSON()
+            self.token_v3_client = V3TokenClientJSON()
+            self.negative_client = NegativeRestClient(auth_provider)
             self.negative_client.service = service
 
-            if client_args_v3_auth:
-                self.servers_client_v3_auth = ServersClientJSON(
-                    *client_args_v3_auth)
-                self.negative_v3_client = NegativeRestClient(
-                    *client_args_v3_auth)
-                self.negative_v3_client.service = service
         else:
             msg = "Unsupported interface type `%s'" % interface
             raise exceptions.InvalidConfiguration(msg)
 
+        # TODO(andreaf) EC2 client still do their auth, v2 only
+        ec2_client_args = (self.credentials.get('username'),
+                           self.credentials.get('password'),
+                           CONF.identity.uri,
+                           self.credentials.get('tenant_name'))
+
         # common clients
-        self.account_client = AccountClient(*client_args)
+        self.account_client = AccountClient(auth_provider)
         if CONF.service_available.glance:
-            self.image_client = ImageClientJSON(*client_args)
-            self.image_client_v2 = ImageClientV2JSON(*client_args)
-        self.container_client = ContainerClient(*client_args)
-        self.object_client = ObjectClient(*client_args)
-        self.orchestration_client = OrchestrationClient(*client_args)
-        self.ec2api_client = botoclients.APIClientEC2(*client_args)
-        self.s3_client = botoclients.ObjectClientS3(*client_args)
-        self.custom_object_client = ObjectClientCustomizedHeader(*client_args)
+            self.image_client = ImageClientJSON(auth_provider)
+            self.image_client_v2 = ImageClientV2JSON(auth_provider)
+        self.container_client = ContainerClient(auth_provider)
+        self.object_client = ObjectClient(auth_provider)
+        self.orchestration_client = OrchestrationClient(
+            auth_provider)
+        self.ec2api_client = botoclients.APIClientEC2(*ec2_client_args)
+        self.s3_client = botoclients.ObjectClientS3(*ec2_client_args)
+        self.custom_object_client = ObjectClientCustomizedHeader(
+            auth_provider)
         self.custom_account_client = \
-            AccountClientCustomizedHeader(*client_args)
-        self.data_processing_client = DataProcessingClient(*client_args)
+            AccountClientCustomizedHeader(auth_provider)
+        self.data_processing_client = DataProcessingClient(
+            auth_provider)
+
+    @classmethod
+    def get_auth_provider_class(cls, auth_version):
+        if auth_version == 'v2':
+            return auth.KeystoneV2AuthProvider
+        else:
+            return auth.KeystoneV3AuthProvider
+
+    def get_default_credentials(self):
+        return dict(
+            username=CONF.identity.username,
+            password=CONF.identity.password,
+            tenant_name=CONF.identity.tenant_name
+        )
+
+    def get_auth_provider(self, credentials=None):
+        auth_params = dict(client_type='tempest',
+                           interface=self.interface)
+        auth_provider_class = self.get_auth_provider_class(self.auth_version)
+        # If invalid / incomplete credentials are provided, use default ones
+        if credentials is None or \
+                not auth_provider_class.check_credentials(credentials):
+            credentials = self.credentials
+        auth_params['credentials'] = credentials
+        return auth_provider_class(**auth_params)
 
 
 class AltManager(Manager):
diff --git a/tempest/common/glance_http.py b/tempest/common/glance_http.py
index d8afab3..4503f13 100644
--- a/tempest/common/glance_http.py
+++ b/tempest/common/glance_http.py
@@ -45,8 +45,10 @@
 
 class HTTPClient(object):
 
-    def __init__(self, endpoint, **kwargs):
-        self.endpoint = endpoint
+    def __init__(self, auth_provider, filters, **kwargs):
+        self.auth_provider = auth_provider
+        self.filters = filters
+        self.endpoint = auth_provider.base_url(filters)
         endpoint_parts = self.parse_endpoint(self.endpoint)
         self.endpoint_scheme = endpoint_parts.scheme
         self.endpoint_hostname = endpoint_parts.hostname
@@ -57,8 +59,6 @@
         self.connection_kwargs = self.get_connection_kwargs(
             self.endpoint_scheme, **kwargs)
 
-        self.auth_token = kwargs.get('token')
-
     @staticmethod
     def parse_endpoint(endpoint):
         return urlparse.urlparse(endpoint)
@@ -100,15 +100,15 @@
         # Copy the kwargs so we can reuse the original in case of redirects
         kwargs['headers'] = copy.deepcopy(kwargs.get('headers', {}))
         kwargs['headers'].setdefault('User-Agent', USER_AGENT)
-        if self.auth_token:
-            kwargs['headers'].setdefault('X-Auth-Token', self.auth_token)
 
         self._log_request(method, url, kwargs['headers'])
 
         conn = self.get_connection()
 
         try:
-            conn_url = posixpath.normpath('%s/%s' % (self.endpoint_path, url))
+            url_parts = self.parse_endpoint(url)
+            conn_url = posixpath.normpath(url_parts.path)
+            LOG.debug('Actual Path: {path}'.format(path=conn_url))
             if kwargs['headers'].get('Transfer-Encoding') == 'chunked':
                 conn.putrequest(method, conn_url)
                 for header, value in kwargs['headers'].items():
@@ -198,7 +198,13 @@
                 # We use 'Transfer-Encoding: chunked' because
                 # body size may not always be known in advance.
                 kwargs['headers']['Transfer-Encoding'] = 'chunked'
-        return self._http_request(url, method, **kwargs)
+
+        # Decorate the request with auth
+        req_url, kwargs['headers'], kwargs['body'] = \
+            self.auth_provider.auth_request(
+                method=method, url=url, headers=kwargs['headers'],
+                body=kwargs.get('body', None), filters=self.filters)
+        return self._http_request(req_url, method, **kwargs)
 
 
 class OpenSSLConnectionDelegator(object):
diff --git a/tempest/common/rest_client.py b/tempest/common/rest_client.py
index d80d4c0..8a85602 100644
--- a/tempest/common/rest_client.py
+++ b/tempest/common/rest_client.py
@@ -41,29 +41,14 @@
     TYPE = "json"
     LOG = logging.getLogger(__name__)
 
-    def __init__(self, user, password, auth_url, tenant_name=None,
-                 auth_version='v2'):
-        self.user = user
-        self.password = password
-        self.auth_url = auth_url
-        self.tenant_name = tenant_name
-        self.auth_version = auth_version
+    def __init__(self, auth_provider):
+        self.auth_provider = auth_provider
 
-        self.service = None
-        self.token = None
-        self.base_url = None
-        self.region = {}
-        for cfgname in dir(CONF):
-            # Find all config.FOO.catalog_type and assume FOO is a service.
-            cfg = getattr(CONF, cfgname)
-            catalog_type = getattr(cfg, 'catalog_type', None)
-            if not catalog_type:
-                continue
-            service_region = getattr(cfg, 'region', None)
-            if not service_region:
-                service_region = CONF.identity.region
-            self.region[catalog_type] = service_region
         self.endpoint_url = 'publicURL'
+        self.service = None
+        # The version of the API this client implements
+        self.api_version = None
+        self._skip_path = False
         self.headers = {'Content-Type': 'application/%s' % self.TYPE,
                         'Accept': 'application/%s' % self.TYPE}
         self.build_interval = CONF.compute.build_interval
@@ -82,194 +67,70 @@
 
     def __str__(self):
         STRING_LIMIT = 80
-        str_format = ("user:%s, password:%s, "
-                      "auth_url:%s, tenant_name:%s, auth_version:%s, "
-                      "service:%s, base_url:%s, region:%s, "
-                      "endpoint_url:%s, build_interval:%s, build_timeout:%s"
+        str_format = ("config:%s, service:%s, base_url:%s, "
+                      "filters: %s, build_interval:%s, build_timeout:%s"
                       "\ntoken:%s..., \nheaders:%s...")
-        return str_format % (self.user, self.password,
-                             self.auth_url, self.tenant_name,
-                             self.auth_version, self.service,
-                             self.base_url, self.region, self.endpoint_url,
-                             self.build_interval, self.build_timeout,
+        return str_format % (CONF, self.service, self.base_url,
+                             self.filters, self.build_interval,
+                             self.build_timeout,
                              str(self.token)[0:STRING_LIMIT],
                              str(self.headers)[0:STRING_LIMIT])
 
-    def _set_auth(self):
+    def _get_region(self, service):
         """
-        Sets the token and base_url used in requests based on the strategy type
+        Returns the region for a specific service
         """
+        service_region = None
+        for cfgname in dir(CONF._config):
+            # Find all config.FOO.catalog_type and assume FOO is a service.
+            cfg = getattr(CONF, cfgname)
+            catalog_type = getattr(cfg, 'catalog_type', None)
+            if catalog_type == service:
+                service_region = getattr(cfg, 'region', None)
+        if not service_region:
+            service_region = CONF.identity.region
+        return service_region
 
-        if self.auth_version == 'v3':
-            auth_func = self.identity_auth_v3
-        else:
-            auth_func = self.keystone_auth
+    @property
+    def user(self):
+        return self.auth_provider.credentials.get('username', None)
 
-        self.token, self.base_url = (
-            auth_func(self.user, self.password, self.auth_url,
-                      self.service, self.tenant_name))
+    @property
+    def tenant_name(self):
+        return self.auth_provider.credentials.get('tenant_name', None)
 
-    def clear_auth(self):
+    @property
+    def password(self):
+        return self.auth_provider.credentials.get('password', None)
+
+    @property
+    def base_url(self):
+        return self.auth_provider.base_url(filters=self.filters)
+
+    @property
+    def filters(self):
+        _filters = dict(
+            service=self.service,
+            endpoint_type=self.endpoint_url,
+            region=self._get_region(self.service)
+        )
+        if self.api_version is not None:
+            _filters['api_version'] = self.api_version
+        if self._skip_path:
+            _filters['skip_path'] = self._skip_path
+        return _filters
+
+    def skip_path(self):
         """
-        Can be called to clear the token and base_url so that the next request
-        will fetch a new token and base_url.
+        When set, ignore the path part of the base URL from the catalog
         """
+        self._skip_path = True
 
-        self.token = None
-        self.base_url = None
-
-    def get_auth(self):
-        """Returns the token of the current request or sets the token if
-        none.
+    def reset_path(self):
         """
-
-        if not self.token:
-            self._set_auth()
-
-        return self.token
-
-    def keystone_auth(self, user, password, auth_url, service, tenant_name):
+        When reset, use the base URL from the catalog as-is
         """
-        Provides authentication via Keystone using v2 identity API.
-        """
-
-        # Normalize URI to ensure /tokens is in it.
-        if 'tokens' not in auth_url:
-            auth_url = auth_url.rstrip('/') + '/tokens'
-
-        creds = {
-            'auth': {
-                'passwordCredentials': {
-                    'username': user,
-                    'password': password,
-                },
-                'tenantName': tenant_name,
-            }
-        }
-
-        headers = {'Content-Type': 'application/json'}
-        body = json.dumps(creds)
-        self._log_request('POST', auth_url, headers, body)
-        resp, resp_body = self.http_obj.request(auth_url, 'POST',
-                                                headers=headers, body=body)
-        self._log_response(resp, resp_body)
-
-        if resp.status == 200:
-            try:
-                auth_data = json.loads(resp_body)['access']
-                token = auth_data['token']['id']
-            except Exception as e:
-                print("Failed to obtain token for user: %s" % e)
-                raise
-
-            mgmt_url = None
-            for ep in auth_data['serviceCatalog']:
-                if ep["type"] == service:
-                    for _ep in ep['endpoints']:
-                        if service in self.region and \
-                                _ep['region'] == self.region[service]:
-                            mgmt_url = _ep[self.endpoint_url]
-                    if not mgmt_url:
-                        mgmt_url = ep['endpoints'][0][self.endpoint_url]
-                    break
-
-            if mgmt_url is None:
-                raise exceptions.EndpointNotFound(service)
-
-            return token, mgmt_url
-
-        elif resp.status == 401:
-            raise exceptions.AuthenticationFailure(user=user,
-                                                   password=password,
-                                                   tenant=tenant_name)
-        raise exceptions.IdentityError('Unexpected status code {0}'.format(
-            resp.status))
-
-    def identity_auth_v3(self, user, password, auth_url, service,
-                         project_name, domain_id='default'):
-        """Provides authentication using Identity API v3."""
-
-        req_url = auth_url.rstrip('/') + '/auth/tokens'
-
-        creds = {
-            "auth": {
-                "identity": {
-                    "methods": ["password"],
-                    "password": {
-                        "user": {
-                            "name": user, "password": password,
-                            "domain": {"id": domain_id}
-                        }
-                    }
-                },
-                "scope": {
-                    "project": {
-                        "domain": {"id": domain_id},
-                        "name": project_name
-                    }
-                }
-            }
-        }
-
-        headers = {'Content-Type': 'application/json'}
-        body = json.dumps(creds)
-        resp, body = self.http_obj.request(req_url, 'POST',
-                                           headers=headers, body=body)
-
-        if resp.status == 201:
-            try:
-                token = resp['x-subject-token']
-            except Exception:
-                self.LOG.exception("Failed to obtain token using V3"
-                                   " authentication (auth URL is '%s')" %
-                                   req_url)
-                raise
-
-            catalog = json.loads(body)['token']['catalog']
-
-            mgmt_url = None
-            for service_info in catalog:
-                if service_info['type'] != service:
-                    continue  # this isn't the entry for us.
-
-                endpoints = service_info['endpoints']
-
-                # Look for an endpoint in the region if configured.
-                if service in self.region:
-                    region = self.region[service]
-
-                    for ep in endpoints:
-                        if ep['region'] != region:
-                            continue
-
-                        mgmt_url = ep['url']
-                        # FIXME(blk-u): this isn't handling endpoint type
-                        # (public, internal, admin).
-                        break
-
-                if not mgmt_url:
-                    # Didn't find endpoint for region, use the first.
-
-                    ep = endpoints[0]
-                    mgmt_url = ep['url']
-                    # FIXME(blk-u): this isn't handling endpoint type
-                    # (public, internal, admin).
-
-                break
-
-            return token, mgmt_url
-
-        elif resp.status == 401:
-            raise exceptions.AuthenticationFailure(user=user,
-                                                   password=password,
-                                                   tenant=project_name)
-        else:
-            self.LOG.error("Failed to obtain token using V3 authentication"
-                           " (auth URL is '%s'), the response status is %s" %
-                           (req_url, resp.status))
-            raise exceptions.AuthenticationFailure(user=user,
-                                                   password=password,
-                                                   tenant=project_name)
+        self._skip_path = False
 
     def expected_success(self, expected_code, read_code):
         assert_msg = ("This function only allowed to use for HTTP status"
@@ -386,25 +247,26 @@
     def _request(self, method, url,
                  headers=None, body=None):
         """A simple HTTP request interface."""
-
-        req_url = "%s/%s" % (self.base_url, url)
-        self._log_request(method, req_url, headers, body)
-        resp, resp_body = self.http_obj.request(req_url, method,
-                                                headers=headers, body=body)
+        # Authenticate the request with the auth provider
+        req_url, req_headers, req_body = self.auth_provider.auth_request(
+            method, url, headers, body, self.filters)
+        self._log_request(method, req_url, req_headers, req_body)
+        # Do the actual request
+        resp, resp_body = self.http_obj.request(
+            req_url, method, headers=req_headers, body=req_body)
         self._log_response(resp, resp_body)
-        self.response_checker(method, url, headers, body, resp, resp_body)
+        # Verify HTTP response codes
+        self.response_checker(method, url, req_headers, req_body, resp,
+                              resp_body)
 
         return resp, resp_body
 
     def request(self, method, url,
                 headers=None, body=None):
         retry = 0
-        if (self.token is None) or (self.base_url is None):
-            self._set_auth()
 
         if headers is None:
             headers = {}
-        headers['X-Auth-Token'] = self.token
 
         resp, resp_body = self._request(method, url,
                                         headers=headers, body=body)
diff --git a/tempest/common/utils/__init__.py b/tempest/common/utils/__init__.py
index 38f3d38..04d898d 100644
--- a/tempest/common/utils/__init__.py
+++ b/tempest/common/utils/__init__.py
@@ -1,4 +1,3 @@
-LAST_REBOOT_TIME_FORMAT = '%Y-%m-%d %H:%M:%S'
 PING_IPV4_COMMAND = 'ping -c 3 '
 PING_IPV6_COMMAND = 'ping6 -c 3 '
 PING_PACKET_LOSS_REGEX = '(\d{1,3})\.?\d*\% packet loss'
diff --git a/tempest/config.py b/tempest/config.py
index 01ba095..068193b 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -43,6 +43,11 @@
                help="Full URI of the OpenStack Identity API (Keystone), v2"),
     cfg.StrOpt('uri_v3',
                help='Full URI of the OpenStack Identity API (Keystone), v3'),
+    cfg.StrOpt('auth_version',
+               default='v2',
+               help="Identity API version to be used for authentication "
+                    "for API tests. Planned to extend to tenant isolation, "
+                    "scenario tests and CLI tests."),
     cfg.StrOpt('region',
                default='RegionOne',
                help="The identity region name to use. Also used as the other "
diff --git a/tempest/services/baremetal/base.py b/tempest/services/baremetal/base.py
index 0b5426e..6e86466 100644
--- a/tempest/services/baremetal/base.py
+++ b/tempest/services/baremetal/base.py
@@ -47,9 +47,8 @@
 
     """
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(BaremetalClient, self).__init__(username, password,
-                                              auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(BaremetalClient, self).__init__(auth_provider)
         self.service = CONF.baremetal.catalog_type
         self.uri_prefix = ''
 
diff --git a/tempest/services/baremetal/v1/base_v1.py b/tempest/services/baremetal/v1/base_v1.py
index 13693e1..3f4c509 100644
--- a/tempest/services/baremetal/v1/base_v1.py
+++ b/tempest/services/baremetal/v1/base_v1.py
@@ -21,9 +21,8 @@
     methods in order to send requests to Ironic.
 
     """
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(BaremetalClientV1, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(BaremetalClientV1, self).__init__(auth_provider)
         self.version = '1'
         self.uri_prefix = 'v%s' % self.version
 
diff --git a/tempest/services/baremetal/v1/client_json.py b/tempest/services/baremetal/v1/client_json.py
index c98b20f..c9dc874 100644
--- a/tempest/services/baremetal/v1/client_json.py
+++ b/tempest/services/baremetal/v1/client_json.py
@@ -18,9 +18,8 @@
 class BaremetalClientJSON(base_v1.BaremetalClientV1):
     """Tempest REST client for Ironic JSON API v1."""
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(BaremetalClientJSON, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(BaremetalClientJSON, self).__init__(auth_provider)
 
         self.serialize = lambda obj_type, obj_body: json.dumps(obj_body)
         self.deserialize = json.loads
diff --git a/tempest/services/compute/json/aggregates_client.py b/tempest/services/compute/json/aggregates_client.py
index dc8a316..aa52081 100644
--- a/tempest/services/compute/json/aggregates_client.py
+++ b/tempest/services/compute/json/aggregates_client.py
@@ -24,9 +24,8 @@
 
 class AggregatesClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(AggregatesClientJSON, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(AggregatesClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_aggregates(self):
diff --git a/tempest/services/compute/json/availability_zone_client.py b/tempest/services/compute/json/availability_zone_client.py
index 2b7e23c..ea4e95e 100644
--- a/tempest/services/compute/json/availability_zone_client.py
+++ b/tempest/services/compute/json/availability_zone_client.py
@@ -23,10 +23,9 @@
 
 class AvailabilityZoneClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(AvailabilityZoneClientJSON, self).__init__(username,
-                                                         password, auth_url,
-                                                         tenant_name)
+    def __init__(self, auth_provider):
+        super(AvailabilityZoneClientJSON, self).__init__(
+            auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_availability_zone_list(self):
diff --git a/tempest/services/compute/json/certificates_client.py b/tempest/services/compute/json/certificates_client.py
index 06e2ae7..b7135f6 100644
--- a/tempest/services/compute/json/certificates_client.py
+++ b/tempest/services/compute/json/certificates_client.py
@@ -23,10 +23,8 @@
 
 class CertificatesClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(CertificatesClientJSON, self).__init__(username,
-                                                     password,
-                                                     auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(CertificatesClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_certificate(self, id):
diff --git a/tempest/services/compute/json/extensions_client.py b/tempest/services/compute/json/extensions_client.py
index 8505d93..f7e2737 100644
--- a/tempest/services/compute/json/extensions_client.py
+++ b/tempest/services/compute/json/extensions_client.py
@@ -23,9 +23,8 @@
 
 class ExtensionsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ExtensionsClientJSON, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ExtensionsClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_extensions(self):
diff --git a/tempest/services/compute/json/fixed_ips_client.py b/tempest/services/compute/json/fixed_ips_client.py
index 19bf4e2..144b7dc 100644
--- a/tempest/services/compute/json/fixed_ips_client.py
+++ b/tempest/services/compute/json/fixed_ips_client.py
@@ -23,9 +23,8 @@
 
 class FixedIPsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(FixedIPsClientJSON, self).__init__(username, password,
-                                                 auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(FixedIPsClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_fixed_ip_details(self, fixed_ip):
diff --git a/tempest/services/compute/json/flavors_client.py b/tempest/services/compute/json/flavors_client.py
index 7fcf1b2..96ab6d7 100644
--- a/tempest/services/compute/json/flavors_client.py
+++ b/tempest/services/compute/json/flavors_client.py
@@ -24,9 +24,8 @@
 
 class FlavorsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(FlavorsClientJSON, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(FlavorsClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_flavors(self, params=None):
diff --git a/tempest/services/compute/json/floating_ips_client.py b/tempest/services/compute/json/floating_ips_client.py
index 7c2139d..2bf5241 100644
--- a/tempest/services/compute/json/floating_ips_client.py
+++ b/tempest/services/compute/json/floating_ips_client.py
@@ -24,9 +24,8 @@
 
 
 class FloatingIPsClientJSON(RestClient):
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(FloatingIPsClientJSON, self).__init__(username, password,
-                                                    auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(FloatingIPsClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_floating_ips(self, params=None):
diff --git a/tempest/services/compute/json/hosts_client.py b/tempest/services/compute/json/hosts_client.py
index 33e5345..aa63927 100644
--- a/tempest/services/compute/json/hosts_client.py
+++ b/tempest/services/compute/json/hosts_client.py
@@ -23,9 +23,8 @@
 
 class HostsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(HostsClientJSON, self).__init__(username, password,
-                                              auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(HostsClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_hosts(self, params=None):
diff --git a/tempest/services/compute/json/hypervisor_client.py b/tempest/services/compute/json/hypervisor_client.py
index a4d8660..74844dc 100644
--- a/tempest/services/compute/json/hypervisor_client.py
+++ b/tempest/services/compute/json/hypervisor_client.py
@@ -23,10 +23,8 @@
 
 class HypervisorClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(HypervisorClientJSON, self).__init__(username,
-                                                   password, auth_url,
-                                                   tenant_name)
+    def __init__(self, auth_provider):
+        super(HypervisorClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_hypervisor_list(self):
diff --git a/tempest/services/compute/json/images_client.py b/tempest/services/compute/json/images_client.py
index c9adc3f..7324d84 100644
--- a/tempest/services/compute/json/images_client.py
+++ b/tempest/services/compute/json/images_client.py
@@ -26,9 +26,8 @@
 
 class ImagesClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ImagesClientJSON, self).__init__(username, password,
-                                               auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ImagesClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
         self.build_interval = CONF.compute.build_interval
         self.build_timeout = CONF.compute.build_timeout
diff --git a/tempest/services/compute/json/instance_usage_audit_log_client.py b/tempest/services/compute/json/instance_usage_audit_log_client.py
index 2673bd7..27930f2 100644
--- a/tempest/services/compute/json/instance_usage_audit_log_client.py
+++ b/tempest/services/compute/json/instance_usage_audit_log_client.py
@@ -23,9 +23,9 @@
 
 class InstanceUsagesAuditLogClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
+    def __init__(self, auth_provider):
         super(InstanceUsagesAuditLogClientJSON, self).__init__(
-            username, password, auth_url, tenant_name)
+            auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_instance_usage_audit_logs(self):
diff --git a/tempest/services/compute/json/interfaces_client.py b/tempest/services/compute/json/interfaces_client.py
index c0a2db2..d9a2030 100644
--- a/tempest/services/compute/json/interfaces_client.py
+++ b/tempest/services/compute/json/interfaces_client.py
@@ -25,9 +25,8 @@
 
 class InterfacesClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(InterfacesClientJSON, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(InterfacesClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_interfaces(self, server):
diff --git a/tempest/services/compute/json/keypairs_client.py b/tempest/services/compute/json/keypairs_client.py
index dd4e3e1..3e2d4a7 100644
--- a/tempest/services/compute/json/keypairs_client.py
+++ b/tempest/services/compute/json/keypairs_client.py
@@ -23,9 +23,8 @@
 
 class KeyPairsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(KeyPairsClientJSON, self).__init__(username, password,
-                                                 auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(KeyPairsClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_keypairs(self):
diff --git a/tempest/services/compute/json/limits_client.py b/tempest/services/compute/json/limits_client.py
index c5cc988..765ba79 100644
--- a/tempest/services/compute/json/limits_client.py
+++ b/tempest/services/compute/json/limits_client.py
@@ -23,9 +23,8 @@
 
 class LimitsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(LimitsClientJSON, self).__init__(username, password,
-                                               auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(LimitsClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_absolute_limits(self):
diff --git a/tempest/services/compute/json/quotas_client.py b/tempest/services/compute/json/quotas_client.py
index df12467..2007d4e 100644
--- a/tempest/services/compute/json/quotas_client.py
+++ b/tempest/services/compute/json/quotas_client.py
@@ -23,9 +23,8 @@
 
 class QuotasClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(QuotasClientJSON, self).__init__(username, password,
-                                               auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(QuotasClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_quota_set(self, tenant_id):
diff --git a/tempest/services/compute/json/security_groups_client.py b/tempest/services/compute/json/security_groups_client.py
index 299a6e6..edaf4a3 100644
--- a/tempest/services/compute/json/security_groups_client.py
+++ b/tempest/services/compute/json/security_groups_client.py
@@ -25,10 +25,8 @@
 
 class SecurityGroupsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(SecurityGroupsClientJSON, self).__init__(username,
-                                                       password, auth_url,
-                                                       tenant_name)
+    def __init__(self, auth_provider):
+        super(SecurityGroupsClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_security_groups(self, params=None):
diff --git a/tempest/services/compute/json/servers_client.py b/tempest/services/compute/json/servers_client.py
index 0987f05..371a59c 100644
--- a/tempest/services/compute/json/servers_client.py
+++ b/tempest/services/compute/json/servers_client.py
@@ -28,11 +28,9 @@
 
 class ServersClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None,
-                 auth_version='v2'):
-        super(ServersClientJSON, self).__init__(username, password,
-                                                auth_url, tenant_name,
-                                                auth_version=auth_version)
+    def __init__(self, auth_provider):
+        super(ServersClientJSON, self).__init__(auth_provider)
+
         self.service = CONF.compute.catalog_type
 
     def create_server(self, name, image_ref, flavor_ref, **kwargs):
diff --git a/tempest/services/compute/json/services_client.py b/tempest/services/compute/json/services_client.py
index c209cf3..4abee47 100644
--- a/tempest/services/compute/json/services_client.py
+++ b/tempest/services/compute/json/services_client.py
@@ -25,9 +25,8 @@
 
 class ServicesClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ServicesClientJSON, self).__init__(username, password,
-                                                 auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ServicesClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_services(self, params=None):
diff --git a/tempest/services/compute/json/tenant_usages_client.py b/tempest/services/compute/json/tenant_usages_client.py
index c141fa7..b14fa9b 100644
--- a/tempest/services/compute/json/tenant_usages_client.py
+++ b/tempest/services/compute/json/tenant_usages_client.py
@@ -24,9 +24,8 @@
 
 class TenantUsagesClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(TenantUsagesClientJSON, self).__init__(
-            username, password, auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(TenantUsagesClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_tenant_usages(self, params=None):
diff --git a/tempest/services/compute/json/volumes_extensions_client.py b/tempest/services/compute/json/volumes_extensions_client.py
index d61b8a5..ba7b5df 100644
--- a/tempest/services/compute/json/volumes_extensions_client.py
+++ b/tempest/services/compute/json/volumes_extensions_client.py
@@ -26,10 +26,9 @@
 
 class VolumesExtensionsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VolumesExtensionsClientJSON, self).__init__(username,
-                                                          password, auth_url,
-                                                          tenant_name)
+    def __init__(self, auth_provider):
+        super(VolumesExtensionsClientJSON, self).__init__(
+            auth_provider)
         self.service = CONF.compute.catalog_type
         self.build_interval = CONF.volume.build_interval
         self.build_timeout = CONF.volume.build_timeout
diff --git a/tempest/services/compute/v3/json/aggregates_client.py b/tempest/services/compute/v3/json/aggregates_client.py
index f3824f8..6bc758c 100644
--- a/tempest/services/compute/v3/json/aggregates_client.py
+++ b/tempest/services/compute/v3/json/aggregates_client.py
@@ -24,10 +24,8 @@
 
 class AggregatesV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(AggregatesV3ClientJSON, self).__init__(username,
-                                                     password, auth_url,
-                                                     tenant_name)
+    def __init__(self, auth_provider):
+        super(AggregatesV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_aggregates(self):
diff --git a/tempest/services/compute/v3/json/availability_zone_client.py b/tempest/services/compute/v3/json/availability_zone_client.py
index a3f4d94..4a6db55 100644
--- a/tempest/services/compute/v3/json/availability_zone_client.py
+++ b/tempest/services/compute/v3/json/availability_zone_client.py
@@ -23,10 +23,9 @@
 
 class AvailabilityZoneV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(AvailabilityZoneV3ClientJSON, self).__init__(username,
-                                                           password, auth_url,
-                                                           tenant_name)
+    def __init__(self, auth_provider):
+        super(AvailabilityZoneV3ClientJSON, self).__init__(
+            auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def get_availability_zone_list(self):
diff --git a/tempest/services/compute/v3/json/certificates_client.py b/tempest/services/compute/v3/json/certificates_client.py
index 1833cb9..0c9f9ac 100644
--- a/tempest/services/compute/v3/json/certificates_client.py
+++ b/tempest/services/compute/v3/json/certificates_client.py
@@ -23,10 +23,8 @@
 
 class CertificatesV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(CertificatesV3ClientJSON, self).__init__(username,
-                                                       password,
-                                                       auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(CertificatesV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def get_certificate(self, id):
diff --git a/tempest/services/compute/v3/json/extensions_client.py b/tempest/services/compute/v3/json/extensions_client.py
index f760093..54f0aba 100644
--- a/tempest/services/compute/v3/json/extensions_client.py
+++ b/tempest/services/compute/v3/json/extensions_client.py
@@ -23,10 +23,8 @@
 
 class ExtensionsV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ExtensionsV3ClientJSON, self).__init__(username,
-                                                     password, auth_url,
-                                                     tenant_name)
+    def __init__(self, auth_provider):
+        super(ExtensionsV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_extensions(self):
diff --git a/tempest/services/compute/v3/json/flavors_client.py b/tempest/services/compute/v3/json/flavors_client.py
index d8a54a6..df3d0c1 100644
--- a/tempest/services/compute/v3/json/flavors_client.py
+++ b/tempest/services/compute/v3/json/flavors_client.py
@@ -24,9 +24,8 @@
 
 class FlavorsV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(FlavorsV3ClientJSON, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(FlavorsV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_flavors(self, params=None):
diff --git a/tempest/services/compute/v3/json/hosts_client.py b/tempest/services/compute/v3/json/hosts_client.py
index d15b237..e33dd5f 100644
--- a/tempest/services/compute/v3/json/hosts_client.py
+++ b/tempest/services/compute/v3/json/hosts_client.py
@@ -23,9 +23,8 @@
 
 class HostsV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(HostsV3ClientJSON, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(HostsV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_hosts(self, params=None):
diff --git a/tempest/services/compute/v3/json/hypervisor_client.py b/tempest/services/compute/v3/json/hypervisor_client.py
index a4ec606..e07a1fb 100644
--- a/tempest/services/compute/v3/json/hypervisor_client.py
+++ b/tempest/services/compute/v3/json/hypervisor_client.py
@@ -23,10 +23,8 @@
 
 class HypervisorV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(HypervisorV3ClientJSON, self).__init__(username,
-                                                     password, auth_url,
-                                                     tenant_name)
+    def __init__(self, auth_provider):
+        super(HypervisorV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def get_hypervisor_list(self):
diff --git a/tempest/services/compute/v3/json/instance_usage_audit_log_client.py b/tempest/services/compute/v3/json/instance_usage_audit_log_client.py
index b51f490..3a6ac5f 100644
--- a/tempest/services/compute/v3/json/instance_usage_audit_log_client.py
+++ b/tempest/services/compute/v3/json/instance_usage_audit_log_client.py
@@ -23,9 +23,9 @@
 
 class InstanceUsagesAuditLogV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
+    def __init__(self, auth_provider):
         super(InstanceUsagesAuditLogV3ClientJSON, self).__init__(
-            username, password, auth_url, tenant_name)
+            auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_instance_usage_audit_logs(self, time_before=None):
diff --git a/tempest/services/compute/v3/json/interfaces_client.py b/tempest/services/compute/v3/json/interfaces_client.py
index dc06395..053b9af 100644
--- a/tempest/services/compute/v3/json/interfaces_client.py
+++ b/tempest/services/compute/v3/json/interfaces_client.py
@@ -25,10 +25,8 @@
 
 class InterfacesV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(InterfacesV3ClientJSON, self).__init__(username,
-                                                     password, auth_url,
-                                                     tenant_name)
+    def __init__(self, auth_provider):
+        super(InterfacesV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_interfaces(self, server):
diff --git a/tempest/services/compute/v3/json/keypairs_client.py b/tempest/services/compute/v3/json/keypairs_client.py
index c2efb84..05dbe25 100644
--- a/tempest/services/compute/v3/json/keypairs_client.py
+++ b/tempest/services/compute/v3/json/keypairs_client.py
@@ -23,9 +23,8 @@
 
 class KeyPairsV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(KeyPairsV3ClientJSON, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(KeyPairsV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_keypairs(self):
diff --git a/tempest/services/compute/v3/json/quotas_client.py b/tempest/services/compute/v3/json/quotas_client.py
index ea0d3a2..1ec8651 100644
--- a/tempest/services/compute/v3/json/quotas_client.py
+++ b/tempest/services/compute/v3/json/quotas_client.py
@@ -23,9 +23,8 @@
 
 class QuotasV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(QuotasV3ClientJSON, self).__init__(username, password,
-                                                 auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(QuotasV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def get_quota_set(self, tenant_id):
diff --git a/tempest/services/compute/v3/json/servers_client.py b/tempest/services/compute/v3/json/servers_client.py
index aa8c95a..11538f5 100644
--- a/tempest/services/compute/v3/json/servers_client.py
+++ b/tempest/services/compute/v3/json/servers_client.py
@@ -29,11 +29,8 @@
 
 class ServersV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url,
-                 tenant_name=None, auth_version='v2'):
-        super(ServersV3ClientJSON, self).__init__(username, password,
-                                                  auth_url, tenant_name,
-                                                  auth_version=auth_version)
+    def __init__(self, auth_provider):
+        super(ServersV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def create_server(self, name, image_ref, flavor_ref, **kwargs):
diff --git a/tempest/services/compute/v3/json/services_client.py b/tempest/services/compute/v3/json/services_client.py
index 174a4f7..1082ea9 100644
--- a/tempest/services/compute/v3/json/services_client.py
+++ b/tempest/services/compute/v3/json/services_client.py
@@ -25,9 +25,8 @@
 
 class ServicesV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ServicesV3ClientJSON, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ServicesV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_services(self, params=None):
diff --git a/tempest/services/compute/v3/json/tenant_usages_client.py b/tempest/services/compute/v3/json/tenant_usages_client.py
index fbc41de..6d59e20 100644
--- a/tempest/services/compute/v3/json/tenant_usages_client.py
+++ b/tempest/services/compute/v3/json/tenant_usages_client.py
@@ -24,9 +24,8 @@
 
 class TenantUsagesV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(TenantUsagesV3ClientJSON, self).__init__(
-            username, password, auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(TenantUsagesV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def list_tenant_usages(self, params=None):
diff --git a/tempest/services/compute/v3/json/version_client.py b/tempest/services/compute/v3/json/version_client.py
index 419bbb8..b560c58 100644
--- a/tempest/services/compute/v3/json/version_client.py
+++ b/tempest/services/compute/v3/json/version_client.py
@@ -23,10 +23,8 @@
 
 class VersionV3ClientJSON(rest_client.RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VersionV3ClientJSON, self).__init__(username,
-                                                  password, auth_url,
-                                                  tenant_name)
+    def __init__(self, auth_provider):
+        super(VersionV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_v3_type
 
     def get_version(self):
diff --git a/tempest/services/compute/xml/aggregates_client.py b/tempest/services/compute/xml/aggregates_client.py
index ddef18b..ba08f58 100644
--- a/tempest/services/compute/xml/aggregates_client.py
+++ b/tempest/services/compute/xml/aggregates_client.py
@@ -28,9 +28,8 @@
 
 class AggregatesClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(AggregatesClientXML, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(AggregatesClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _format_aggregate(self, g):
diff --git a/tempest/services/compute/xml/availability_zone_client.py b/tempest/services/compute/xml/availability_zone_client.py
index ac1bb4b..38280b5 100644
--- a/tempest/services/compute/xml/availability_zone_client.py
+++ b/tempest/services/compute/xml/availability_zone_client.py
@@ -24,10 +24,9 @@
 
 class AvailabilityZoneClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(AvailabilityZoneClientXML, self).__init__(username,
-                                                        password, auth_url,
-                                                        tenant_name)
+    def __init__(self, auth_provider):
+        super(AvailabilityZoneClientXML, self).__init__(
+            auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _parse_array(self, node):
diff --git a/tempest/services/compute/xml/certificates_client.py b/tempest/services/compute/xml/certificates_client.py
index 3f2438d..aad20a4 100644
--- a/tempest/services/compute/xml/certificates_client.py
+++ b/tempest/services/compute/xml/certificates_client.py
@@ -22,9 +22,8 @@
 
 class CertificatesClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(CertificatesClientXML, self).__init__(username, password,
-                                                    auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(CertificatesClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_certificate(self, id):
diff --git a/tempest/services/compute/xml/extensions_client.py b/tempest/services/compute/xml/extensions_client.py
index 98cd3e3..9753ca8 100644
--- a/tempest/services/compute/xml/extensions_client.py
+++ b/tempest/services/compute/xml/extensions_client.py
@@ -24,9 +24,8 @@
 
 class ExtensionsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ExtensionsClientXML, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ExtensionsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _parse_array(self, node):
diff --git a/tempest/services/compute/xml/fixed_ips_client.py b/tempest/services/compute/xml/fixed_ips_client.py
index f212e21..599e168 100644
--- a/tempest/services/compute/xml/fixed_ips_client.py
+++ b/tempest/services/compute/xml/fixed_ips_client.py
@@ -25,9 +25,8 @@
 
 class FixedIPsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(FixedIPsClientXML, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(FixedIPsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_fixed_ip_details(self, fixed_ip):
diff --git a/tempest/services/compute/xml/flavors_client.py b/tempest/services/compute/xml/flavors_client.py
index 74c0e47..fb16d20 100644
--- a/tempest/services/compute/xml/flavors_client.py
+++ b/tempest/services/compute/xml/flavors_client.py
@@ -35,9 +35,8 @@
 
 class FlavorsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(FlavorsClientXML, self).__init__(username, password,
-                                               auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(FlavorsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _format_flavor(self, f):
diff --git a/tempest/services/compute/xml/floating_ips_client.py b/tempest/services/compute/xml/floating_ips_client.py
index bbfe86b..0119d8a 100644
--- a/tempest/services/compute/xml/floating_ips_client.py
+++ b/tempest/services/compute/xml/floating_ips_client.py
@@ -28,9 +28,8 @@
 
 
 class FloatingIPsClientXML(RestClientXML):
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(FloatingIPsClientXML, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(FloatingIPsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _parse_array(self, node):
diff --git a/tempest/services/compute/xml/hosts_client.py b/tempest/services/compute/xml/hosts_client.py
index 441be0e..daa83c9 100644
--- a/tempest/services/compute/xml/hosts_client.py
+++ b/tempest/services/compute/xml/hosts_client.py
@@ -26,9 +26,8 @@
 
 class HostsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(HostsClientXML, self).__init__(username, password,
-                                             auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(HostsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_hosts(self, params=None):
diff --git a/tempest/services/compute/xml/hypervisor_client.py b/tempest/services/compute/xml/hypervisor_client.py
index bee2dfd..5abaad8 100644
--- a/tempest/services/compute/xml/hypervisor_client.py
+++ b/tempest/services/compute/xml/hypervisor_client.py
@@ -24,10 +24,8 @@
 
 class HypervisorClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(HypervisorClientXML, self).__init__(username,
-                                                  password, auth_url,
-                                                  tenant_name)
+    def __init__(self, auth_provider):
+        super(HypervisorClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _parse_array(self, node):
diff --git a/tempest/services/compute/xml/images_client.py b/tempest/services/compute/xml/images_client.py
index 98de7df..d90a7d8 100644
--- a/tempest/services/compute/xml/images_client.py
+++ b/tempest/services/compute/xml/images_client.py
@@ -32,9 +32,8 @@
 
 class ImagesClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ImagesClientXML, self).__init__(username, password,
-                                              auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ImagesClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
         self.build_interval = CONF.compute.build_interval
         self.build_timeout = CONF.compute.build_timeout
diff --git a/tempest/services/compute/xml/instance_usage_audit_log_client.py b/tempest/services/compute/xml/instance_usage_audit_log_client.py
index 2e1d6c8..562774b 100644
--- a/tempest/services/compute/xml/instance_usage_audit_log_client.py
+++ b/tempest/services/compute/xml/instance_usage_audit_log_client.py
@@ -24,9 +24,9 @@
 
 class InstanceUsagesAuditLogClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
+    def __init__(self, auth_provider):
         super(InstanceUsagesAuditLogClientXML, self).__init__(
-            username, password, auth_url, tenant_name)
+            auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_instance_usage_audit_logs(self):
diff --git a/tempest/services/compute/xml/interfaces_client.py b/tempest/services/compute/xml/interfaces_client.py
index c90f507..4194d7d 100644
--- a/tempest/services/compute/xml/interfaces_client.py
+++ b/tempest/services/compute/xml/interfaces_client.py
@@ -30,9 +30,8 @@
 
 class InterfacesClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(InterfacesClientXML, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(InterfacesClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _process_xml_interface(self, node):
diff --git a/tempest/services/compute/xml/keypairs_client.py b/tempest/services/compute/xml/keypairs_client.py
index da3303e..92fade4 100644
--- a/tempest/services/compute/xml/keypairs_client.py
+++ b/tempest/services/compute/xml/keypairs_client.py
@@ -28,9 +28,8 @@
 
 class KeyPairsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(KeyPairsClientXML, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(KeyPairsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_keypairs(self):
diff --git a/tempest/services/compute/xml/limits_client.py b/tempest/services/compute/xml/limits_client.py
index 9233697..2a8fbec 100644
--- a/tempest/services/compute/xml/limits_client.py
+++ b/tempest/services/compute/xml/limits_client.py
@@ -25,9 +25,8 @@
 
 class LimitsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(LimitsClientXML, self).__init__(username, password,
-                                              auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(LimitsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def get_absolute_limits(self):
diff --git a/tempest/services/compute/xml/quotas_client.py b/tempest/services/compute/xml/quotas_client.py
index 74aad1b..f1041f0 100644
--- a/tempest/services/compute/xml/quotas_client.py
+++ b/tempest/services/compute/xml/quotas_client.py
@@ -27,9 +27,8 @@
 
 class QuotasClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(QuotasClientXML, self).__init__(username, password,
-                                              auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(QuotasClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _format_quota(self, q):
diff --git a/tempest/services/compute/xml/security_groups_client.py b/tempest/services/compute/xml/security_groups_client.py
index c32a81e..83072be 100644
--- a/tempest/services/compute/xml/security_groups_client.py
+++ b/tempest/services/compute/xml/security_groups_client.py
@@ -30,10 +30,8 @@
 
 class SecurityGroupsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(SecurityGroupsClientXML, self).__init__(
-            username, password,
-            auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(SecurityGroupsClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _parse_array(self, node):
diff --git a/tempest/services/compute/xml/servers_client.py b/tempest/services/compute/xml/servers_client.py
index c16d4a3..37980c9 100644
--- a/tempest/services/compute/xml/servers_client.py
+++ b/tempest/services/compute/xml/servers_client.py
@@ -141,11 +141,8 @@
 
 class ServersClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None,
-                 auth_version='v2'):
-        super(ServersClientXML, self).__init__(username, password,
-                                               auth_url, tenant_name,
-                                               auth_version=auth_version)
+    def __init__(self, auth_provider):
+        super(ServersClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _parse_key_value(self, node):
diff --git a/tempest/services/compute/xml/services_client.py b/tempest/services/compute/xml/services_client.py
index bfc824d..c28dc12 100644
--- a/tempest/services/compute/xml/services_client.py
+++ b/tempest/services/compute/xml/services_client.py
@@ -29,9 +29,8 @@
 
 class ServicesClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ServicesClientXML, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ServicesClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def list_services(self, params=None):
diff --git a/tempest/services/compute/xml/tenant_usages_client.py b/tempest/services/compute/xml/tenant_usages_client.py
index ae813a6..93eeb00 100644
--- a/tempest/services/compute/xml/tenant_usages_client.py
+++ b/tempest/services/compute/xml/tenant_usages_client.py
@@ -26,10 +26,8 @@
 
 class TenantUsagesClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(TenantUsagesClientXML, self).__init__(username,
-                                                    password, auth_url,
-                                                    tenant_name)
+    def __init__(self, auth_provider):
+        super(TenantUsagesClientXML, self).__init__(auth_provider)
         self.service = CONF.compute.catalog_type
 
     def _parse_array(self, node):
diff --git a/tempest/services/compute/xml/volumes_extensions_client.py b/tempest/services/compute/xml/volumes_extensions_client.py
index d6723e1..941cd69 100644
--- a/tempest/services/compute/xml/volumes_extensions_client.py
+++ b/tempest/services/compute/xml/volumes_extensions_client.py
@@ -32,9 +32,9 @@
 
 class VolumesExtensionsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VolumesExtensionsClientXML, self).__init__(username, password,
-                                                         auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(VolumesExtensionsClientXML, self).__init__(
+            auth_provider)
         self.service = CONF.compute.catalog_type
         self.build_interval = CONF.compute.build_interval
         self.build_timeout = CONF.compute.build_timeout
diff --git a/tempest/services/data_processing/v1_1/client.py b/tempest/services/data_processing/v1_1/client.py
index a1d558a..db21201 100644
--- a/tempest/services/data_processing/v1_1/client.py
+++ b/tempest/services/data_processing/v1_1/client.py
@@ -22,9 +22,8 @@
 
 
 class DataProcessingClient(rest_client.RestClient):
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(DataProcessingClient, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(DataProcessingClient, self).__init__(auth_provider)
         self.service = CONF.data_processing.catalog_type
 
     @classmethod
diff --git a/tempest/services/identity/json/identity_client.py b/tempest/services/identity/json/identity_client.py
index 1ed7044..c018215 100644
--- a/tempest/services/identity/json/identity_client.py
+++ b/tempest/services/identity/json/identity_client.py
@@ -12,7 +12,6 @@
 
 import json
 
-from tempest.common import http
 from tempest.common.rest_client import RestClient
 from tempest import config
 from tempest import exceptions
@@ -22,9 +21,8 @@
 
 class IdentityClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(IdentityClientJSON, self).__init__(username, password,
-                                                 auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(IdentityClientJSON, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
 
@@ -243,9 +241,9 @@
 class TokenClientJSON(RestClient):
 
     def __init__(self):
+        super(TokenClientJSON, self).__init__(None)
         auth_url = CONF.identity.uri
 
-        # TODO(jaypipes) Why is this all repeated code in here?
         # Normalize URI to ensure /tokens is in it.
         if 'tokens' not in auth_url:
             auth_url = auth_url.rstrip('/') + '/tokens'
@@ -262,16 +260,13 @@
                 'tenantName': tenant,
             }
         }
-        headers = {'Content-Type': 'application/json'}
         body = json.dumps(creds)
-        resp, body = self.post(self.auth_url, headers=headers, body=body)
-        return resp, body
+        resp, body = self.post(self.auth_url, headers=self.headers, body=body)
+
+        return resp, body['access']
 
     def request(self, method, url, headers=None, body=None):
         """A simple HTTP request interface."""
-        dscv = CONF.identity.disable_ssl_certificate_validation
-        self.http_obj = http.ClosingHttp(
-            disable_ssl_certificate_validation=dscv)
         if headers is None:
             headers = {}
 
@@ -280,16 +275,22 @@
                                                 headers=headers, body=body)
         self._log_response(resp, resp_body)
 
-        if resp.status in (401, 403):
+        if resp.status in [401, 403]:
             resp_body = json.loads(resp_body)
             raise exceptions.Unauthorized(resp_body['error']['message'])
+        elif resp.status not in [200, 201]:
+            raise exceptions.IdentityError(
+                'Unexpected status code {0}'.format(resp.status))
 
-        return resp, resp_body
+        return resp, json.loads(resp_body)
 
-    def get_token(self, user, password, tenant):
+    def get_token(self, user, password, tenant, auth_data=False):
+        """
+        Returns (token id, token data) for supplied credentials
+        """
         resp, body = self.auth(user, password, tenant)
-        if resp['status'] != '202':
-            body = json.loads(body)
-            access = body['access']
-            token = access['token']
-            return token['id']
+
+        if auth_data:
+            return body['token']['id'], body
+        else:
+            return body['token']['id']
diff --git a/tempest/services/identity/v3/json/credentials_client.py b/tempest/services/identity/v3/json/credentials_client.py
index 1250d79..a0fbb76 100644
--- a/tempest/services/identity/v3/json/credentials_client.py
+++ b/tempest/services/identity/v3/json/credentials_client.py
@@ -14,7 +14,6 @@
 #    under the License.
 
 import json
-from urlparse import urlparse
 
 from tempest.common.rest_client import RestClient
 from tempest import config
@@ -24,20 +23,11 @@
 
 class CredentialsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(CredentialsClientJSON, self).__init__(username, password,
-                                                    auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(CredentialsClientJSON, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
-
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(CredentialsClientJSON, self).request(method, url,
-                                                          headers=headers,
-                                                          body=body)
+        self.api_version = "v3"
 
     def create_credential(self, access_key, secret_key, user_id, project_id):
         """Creates a credential."""
diff --git a/tempest/services/identity/v3/json/endpoints_client.py b/tempest/services/identity/v3/json/endpoints_client.py
index bb2230b..1b78115 100644
--- a/tempest/services/identity/v3/json/endpoints_client.py
+++ b/tempest/services/identity/v3/json/endpoints_client.py
@@ -14,7 +14,6 @@
 #    under the License.
 
 import json
-import urlparse
 
 from tempest.common.rest_client import RestClient
 from tempest import config
@@ -24,20 +23,11 @@
 
 class EndPointClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(EndPointClientJSON, self).__init__(username, password,
-                                                 auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(EndPointClientJSON, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
-
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(
-            urlparse.urlparse(self.base_url).path, "/v3")
-        return super(EndPointClientJSON, self).request(method, url,
-                                                       headers=headers,
-                                                       body=body)
+        self.api_version = "v3"
 
     def list_endpoints(self):
         """GET endpoints."""
diff --git a/tempest/services/identity/v3/json/identity_client.py b/tempest/services/identity/v3/json/identity_client.py
index 7dd5c6e..ab1dc94 100644
--- a/tempest/services/identity/v3/json/identity_client.py
+++ b/tempest/services/identity/v3/json/identity_client.py
@@ -14,30 +14,22 @@
 #    under the License.
 
 import json
-from urlparse import urlparse
+import urlparse
 
 from tempest.common.rest_client import RestClient
 from tempest import config
+from tempest import exceptions
 
 CONF = config.CONF
 
 
 class IdentityV3ClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(IdentityV3ClientJSON, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(IdentityV3ClientJSON, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
-
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(IdentityV3ClientJSON, self).request(method, url,
-                                                         headers=headers,
-                                                         body=body)
+        self.api_version = "v3"
 
     def create_user(self, user_name, **kwargs):
         """Creates a user."""
@@ -462,43 +454,89 @@
 
 class V3TokenClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(V3TokenClientJSON, self).__init__(username, password,
-                                                auth_url, tenant_name)
-        self.service = CONF.identity.catalog_type
-        self.endpoint_url = 'adminURL'
+    def __init__(self):
+        super(V3TokenClientJSON, self).__init__(None)
+        auth_url = CONF.identity.uri_v3
+        # If the v3 url is not set, get it from the v2 one
+        if auth_url is None:
+            auth_url = CONF.identity.uri.replace(urlparse.urlparse(
+                CONF.identity.uri).path, "/v3")
 
-        auth_url = CONF.identity.uri
-
-        if 'tokens' not in auth_url:
-            auth_url = auth_url.rstrip('/') + '/tokens'
+        if 'auth/tokens' not in auth_url:
+            auth_url = auth_url.rstrip('/') + '/auth/tokens'
 
         self.auth_url = auth_url
 
-    def auth(self, user_id, password):
+    def auth(self, user, password, tenant=None, user_type='id', domain=None):
+        """
+        :param user: user id or name, as specified in user_type
+        :param domain: the user and tenant domain
+
+        Accepts different combinations of credentials. Restrictions:
+        - tenant and domain are only name (no id)
+        - user domain and tenant domain are assumed identical
+        - domain scope is not supported here
+        Sample sample valid combinations:
+        - user_id, password
+        - username, password, domain
+        - username, password, tenant, domain
+        Validation is left to the server side.
+        """
         creds = {
             'auth': {
                 'identity': {
                     'methods': ['password'],
                     'password': {
                         'user': {
-                            'id': user_id,
-                            'password': password
+                            'password': password,
                         }
                     }
                 }
             }
         }
-        headers = {'Content-Type': 'application/json'}
+        if user_type == 'id':
+            creds['auth']['identity']['password']['user']['id'] = user
+        else:
+            creds['auth']['identity']['password']['user']['name'] = user
+        if domain is not None:
+            _domain = dict(name=domain)
+            creds['auth']['identity']['password']['user']['domain'] = _domain
+        if tenant is not None:
+            project = dict(name=tenant, domain=_domain)
+            scope = dict(project=project)
+            creds['auth']['scope'] = scope
+
         body = json.dumps(creds)
-        resp, body = self.post("auth/tokens", headers=headers, body=body)
+        resp, body = self.post(self.auth_url, headers=self.headers, body=body)
         return resp, body
 
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(V3TokenClientJSON, self).request(method, url,
-                                                      headers=headers,
-                                                      body=body)
+    def request(self, method, url, headers=None, body=None):
+        """A simple HTTP request interface."""
+        self._log_request(method, url, headers, body)
+        resp, resp_body = self.http_obj.request(url, method,
+                                                headers=headers, body=body)
+        self._log_response(resp, resp_body)
+
+        if resp.status in [401, 403]:
+            resp_body = json.loads(resp_body)
+            raise exceptions.Unauthorized(resp_body['error']['message'])
+        elif resp.status not in [200, 201, 204]:
+            raise exceptions.IdentityError(
+                'Unexpected status code {0}'.format(resp.status))
+
+        return resp, json.loads(resp_body)
+
+    def get_token(self, user, password, tenant, domain='Default',
+                  auth_data=False):
+        """
+        :param user: username
+        Returns (token id, token data) for supplied credentials
+        """
+        resp, body = self.auth(user, password, tenant, user_type='name',
+                               domain=domain)
+
+        token = resp.get('x-subject-token')
+        if auth_data:
+            return token, body['token']
+        else:
+            return token
diff --git a/tempest/services/identity/v3/json/policy_client.py b/tempest/services/identity/v3/json/policy_client.py
index 3d98d99..c376979 100644
--- a/tempest/services/identity/v3/json/policy_client.py
+++ b/tempest/services/identity/v3/json/policy_client.py
@@ -14,7 +14,6 @@
 #    under the License.
 
 import json
-from urlparse import urlparse
 
 from tempest.common.rest_client import RestClient
 from tempest import config
@@ -24,20 +23,11 @@
 
 class PolicyClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(PolicyClientJSON, self).__init__(username, password,
-                                               auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(PolicyClientJSON, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
-
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(PolicyClientJSON, self).request(method, url,
-                                                     headers=headers,
-                                                     body=body)
+        self.api_version = "v3"
 
     def create_policy(self, blob, type):
         """Creates a Policy."""
diff --git a/tempest/services/identity/v3/json/service_client.py b/tempest/services/identity/v3/json/service_client.py
index 57b6e9e..92f7629 100644
--- a/tempest/services/identity/v3/json/service_client.py
+++ b/tempest/services/identity/v3/json/service_client.py
@@ -14,7 +14,6 @@
 #    under the License.
 
 import json
-from urlparse import urlparse
 
 from tempest.common.rest_client import RestClient
 from tempest import config
@@ -24,20 +23,11 @@
 
 class ServiceClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ServiceClientJSON, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ServiceClientJSON, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
-
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(ServiceClientJSON, self).request(method, url,
-                                                      headers=headers,
-                                                      body=body)
+        self.api_version = "v3"
 
     def update_service(self, service_id, **kwargs):
         """Updates a service."""
diff --git a/tempest/services/identity/v3/xml/credentials_client.py b/tempest/services/identity/v3/xml/credentials_client.py
index c8cdce7..eca86ab 100644
--- a/tempest/services/identity/v3/xml/credentials_client.py
+++ b/tempest/services/identity/v3/xml/credentials_client.py
@@ -14,7 +14,6 @@
 #    under the License.
 
 import json
-from urlparse import urlparse
 
 from lxml import etree
 
@@ -32,20 +31,11 @@
 
 class CredentialsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(CredentialsClientXML, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(CredentialsClientXML, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
-
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(CredentialsClientXML, self).request(method, url,
-                                                         headers=headers,
-                                                         body=body)
+        self.api_version = "v3"
 
     def _parse_body(self, body):
         data = xml_to_json(body)
diff --git a/tempest/services/identity/v3/xml/endpoints_client.py b/tempest/services/identity/v3/xml/endpoints_client.py
index e1df3a9..a20a9f5 100644
--- a/tempest/services/identity/v3/xml/endpoints_client.py
+++ b/tempest/services/identity/v3/xml/endpoints_client.py
@@ -12,7 +12,6 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-import urlparse
 
 from lxml import etree
 
@@ -30,11 +29,11 @@
 
 class EndPointClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(EndPointClientXML, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(EndPointClientXML, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
+        self.api_version = "v3"
 
     def _parse_array(self, node):
         array = []
@@ -53,9 +52,6 @@
         dscv = CONF.identity.disable_ssl_certificate_validation
         self.http_obj = http.ClosingHttp(
             disable_ssl_certificate_validation=dscv)
-        self._set_auth()
-        self.base_url = self.base_url.replace(
-            urlparse.urlparse(self.base_url).path, "/v3")
         return super(EndPointClientXML, self).request(method, url,
                                                       headers=headers,
                                                       body=body)
diff --git a/tempest/services/identity/v3/xml/identity_client.py b/tempest/services/identity/v3/xml/identity_client.py
index de75fe5..e7b85c1 100644
--- a/tempest/services/identity/v3/xml/identity_client.py
+++ b/tempest/services/identity/v3/xml/identity_client.py
@@ -13,12 +13,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from urlparse import urlparse
+import json
+import urlparse
 
 from lxml import etree
 
 from tempest.common.rest_client import RestClientXML
 from tempest import config
+from tempest import exceptions
 from tempest.services.compute.xml.common import Document
 from tempest.services.compute.xml.common import Element
 from tempest.services.compute.xml.common import Text
@@ -31,11 +33,11 @@
 
 class IdentityV3ClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(IdentityV3ClientXML, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(IdentityV3ClientXML, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
+        self.api_version = "v3"
 
     def _parse_projects(self, node):
         array = []
@@ -76,17 +78,8 @@
         return array
 
     def _parse_body(self, body):
-        json = xml_to_json(body)
-        return json
-
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class RestClient."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(IdentityV3ClientXML, self).request(method, url,
-                                                        headers=headers,
-                                                        body=body)
+        _json = xml_to_json(body)
+        return _json
 
     def create_user(self, user_name, **kwargs):
         """Creates a user."""
@@ -454,25 +447,41 @@
 
 class V3TokenClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(V3TokenClientXML, self).__init__(username, password,
-                                               auth_url, tenant_name)
-        self.service = CONF.identity.catalog_type
-        self.endpoint_url = 'adminURL'
-
-        auth_url = CONF.identity.uri
-
-        if 'tokens' not in auth_url:
-            auth_url = auth_url.rstrip('/') + '/tokens'
+    def __init__(self):
+        super(V3TokenClientXML, self).__init__(None)
+        auth_url = CONF.identity.uri_v3
+        # If the v3 url is not set, get it from the v2 one
+        if auth_url is None:
+            auth_url = CONF.identity.uri.replace(urlparse.urlparse(
+                CONF.identity.uri).path, "/v3")
+        if 'auth/tokens' not in auth_url:
+            auth_url = auth_url.rstrip('/') + '/auth/tokens'
 
         self.auth_url = auth_url
 
-    def auth(self, user_id, password):
-        user = Element('user',
-                       id=user_id,
-                       password=password)
+    def auth(self, user, password, tenant=None, user_type='id', domain=None):
+        """
+        :param user: user id or name, as specified in user_type
+
+        Accepts different combinations of credentials. Restrictions:
+        - tenant and domain are only name (no id)
+        - user domain and tenant domain are assumed identical
+        Sample sample valid combinations:
+        - user_id, password
+        - username, password, domain
+        - username, password, tenant, domain
+        Validation is left to the server side.
+        """
+        if user_type == 'id':
+            _user = Element('user', id=user, password=password)
+        else:
+            _user = Element('user', name=user, password=password)
+        if domain is not None:
+            _domain = Element('domain', name=domain)
+            _user.append(_domain)
+
         password = Element('password')
-        password.append(user)
+        password.append(_user)
 
         method = Element('method')
         method.append(Text('password'))
@@ -481,18 +490,51 @@
         identity = Element('identity')
         identity.append(methods)
         identity.append(password)
+
         auth = Element('auth')
         auth.append(identity)
-        headers = {'Content-Type': 'application/xml'}
-        resp, body = self.post("auth/tokens", headers=headers,
+
+        if tenant is not None:
+            project = Element('project', name=tenant)
+            project.append(_domain)
+            scope = Element('scope')
+            scope.append(project)
+            auth.append(scope)
+
+        resp, body = self.post(self.auth_url, headers=self.headers,
                                body=str(Document(auth)))
         return resp, body
 
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(V3TokenClientXML, self).request(method, url,
-                                                     headers=headers,
-                                                     body=body)
+    def request(self, method, url, headers=None, body=None):
+        """A simple HTTP request interface."""
+        # Send XML, accept JSON. XML response is not easily
+        # converted to the corresponding JSON one
+        headers['Accept'] = 'application/json'
+        self._log_request(method, url, headers, body)
+        resp, resp_body = self.http_obj.request(url, method,
+                                                headers=headers, body=body)
+        self._log_response(resp, resp_body)
+
+        if resp.status in [401, 403]:
+            resp_body = json.loads(resp_body)
+            raise exceptions.Unauthorized(resp_body['error']['message'])
+        elif resp.status not in [200, 201, 204]:
+            raise exceptions.IdentityError(
+                'Unexpected status code {0}'.format(resp.status))
+
+        return resp, json.loads(resp_body)
+
+    def get_token(self, user, password, tenant, domain='Default',
+                  auth_data=False):
+        """
+        :param user: username
+        Returns (token id, token data) for supplied credentials
+        """
+        resp, body = self.auth(user, password, tenant, user_type='name',
+                               domain=domain)
+
+        token = resp.get('x-subject-token')
+        if auth_data:
+            return token, body['token']
+        else:
+            return token
diff --git a/tempest/services/identity/v3/xml/policy_client.py b/tempest/services/identity/v3/xml/policy_client.py
index 54b4ad8..429c6a4 100644
--- a/tempest/services/identity/v3/xml/policy_client.py
+++ b/tempest/services/identity/v3/xml/policy_client.py
@@ -13,8 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from urlparse import urlparse
-
 from lxml import etree
 
 from tempest.common import http
@@ -31,11 +29,11 @@
 
 class PolicyClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(PolicyClientXML, self).__init__(username, password,
-                                              auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(PolicyClientXML, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
+        self.api_version = "v3"
 
     def _parse_array(self, node):
         array = []
@@ -54,9 +52,6 @@
         dscv = CONF.identity.disable_ssl_certificate_validation
         self.http_obj = http.ClosingHttp(
             disable_ssl_certificate_validation=dscv)
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
         return super(PolicyClientXML, self).request(method, url,
                                                     headers=headers,
                                                     body=body)
diff --git a/tempest/services/identity/v3/xml/service_client.py b/tempest/services/identity/v3/xml/service_client.py
index 2997775..df9b234 100644
--- a/tempest/services/identity/v3/xml/service_client.py
+++ b/tempest/services/identity/v3/xml/service_client.py
@@ -13,8 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from urlparse import urlparse
-
 from lxml import etree
 
 from tempest.common.rest_client import RestClientXML
@@ -30,11 +28,11 @@
 
 class ServiceClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ServiceClientXML, self).__init__(username, password,
-                                               auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ServiceClientXML, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
+        self.api_version = "v3"
 
     def _parse_array(self, node):
         array = []
@@ -46,15 +44,6 @@
         data = xml_to_json(body)
         return data
 
-    def request(self, method, url, headers=None, body=None, wait=None):
-        """Overriding the existing HTTP request in super class rest_client."""
-        self._set_auth()
-        self.base_url = self.base_url.replace(urlparse(self.base_url).path,
-                                              "/v3")
-        return super(ServiceClientXML, self).request(method, url,
-                                                     headers=headers,
-                                                     body=body)
-
     def update_service(self, service_id, **kwargs):
         """Updates a service_id."""
         resp, body = self.get_service(service_id)
diff --git a/tempest/services/identity/xml/identity_client.py b/tempest/services/identity/xml/identity_client.py
index e6a7188..7c36680 100644
--- a/tempest/services/identity/xml/identity_client.py
+++ b/tempest/services/identity/xml/identity_client.py
@@ -17,7 +17,6 @@
 
 from lxml import etree
 
-from tempest.common import http
 from tempest.common.rest_client import RestClientXML
 from tempest import config
 from tempest import exceptions
@@ -32,9 +31,8 @@
 
 class IdentityClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(IdentityClientXML, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(IdentityClientXML, self).__init__(auth_provider)
         self.service = CONF.identity.catalog_type
         self.endpoint_url = 'adminURL'
 
@@ -266,9 +264,9 @@
 class TokenClientXML(RestClientXML):
 
     def __init__(self):
+        super(TokenClientXML, self).__init__(None)
         auth_url = CONF.identity.uri
 
-        # TODO(jaypipes) Why is this all repeated code in here?
         # Normalize URI to ensure /tokens is in it.
         if 'tokens' not in auth_url:
             auth_url = auth_url.rstrip('/') + '/tokens'
@@ -281,33 +279,38 @@
                                 password=password)
         auth = Element("auth", tenantName=tenant)
         auth.append(passwordCreds)
-        headers = {'Content-Type': 'application/xml'}
-        resp, body = self.post(self.auth_url, headers=headers,
+        resp, body = self.post(self.auth_url, headers=self.headers,
                                body=str(Document(auth)))
-        return resp, body
+        return resp, body['access']
 
     def request(self, method, url, headers=None, body=None):
         """A simple HTTP request interface."""
-        dscv = CONF.identity.disable_ssl_certificate_validation
-        self.http_obj = http.ClosingHttp(
-            disable_ssl_certificate_validation=dscv)
         if headers is None:
             headers = {}
+        # Send XML, accept JSON. XML response is not easily
+        # converted to the corresponding JSON one
+        headers['Accept'] = 'application/json'
         self._log_request(method, url, headers, body)
         resp, resp_body = self.http_obj.request(url, method,
                                                 headers=headers, body=body)
         self._log_response(resp, resp_body)
 
-        if resp.status in (401, 403):
+        if resp.status in [401, 403]:
             resp_body = json.loads(resp_body)
             raise exceptions.Unauthorized(resp_body['error']['message'])
+        elif resp.status not in [200, 201]:
+            raise exceptions.IdentityError(
+                'Unexpected status code {0}'.format(resp.status))
 
-        return resp, resp_body
+        return resp, json.loads(resp_body)
 
-    def get_token(self, user, password, tenant):
+    def get_token(self, user, password, tenant, auth_data=False):
+        """
+        Returns (token id, token data) for supplied credentials
+        """
         resp, body = self.auth(user, password, tenant)
-        if resp['status'] != '202':
-            body = json.loads(body)
-            access = body['access']
-            token = access['token']
-            return token['id']
+
+        if auth_data:
+            return body['token']['id'], body
+        else:
+            return body['token']['id']
diff --git a/tempest/services/image/v1/json/image_client.py b/tempest/services/image/v1/json/image_client.py
index a5b93a0..17271cc 100644
--- a/tempest/services/image/v1/json/image_client.py
+++ b/tempest/services/image/v1/json/image_client.py
@@ -33,12 +33,10 @@
 
 class ImageClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ImageClientJSON, self).__init__(username, password,
-                                              auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ImageClientJSON, self).__init__(auth_provider)
         self.service = CONF.images.catalog_type
-        if CONF.service_available.glance:
-            self.http = self._get_http()
+        self._http = None
 
     def _image_meta_from_headers(self, headers):
         meta = {'properties': {}}
@@ -106,13 +104,9 @@
             return None
 
     def _get_http(self):
-        token, endpoint = self.keystone_auth(self.user,
-                                             self.password,
-                                             self.auth_url,
-                                             self.service,
-                                             self.tenant_name)
         dscv = CONF.identity.disable_ssl_certificate_validation
-        return glance_http.HTTPClient(endpoint=endpoint, token=token,
+        return glance_http.HTTPClient(auth_provider=self.auth_provider,
+                                      filters=self.filters,
                                       insecure=dscv)
 
     def _create_with_data(self, headers, data):
@@ -132,6 +126,13 @@
         body = json.loads(''.join([c for c in body_iter]))
         return resp, body['image']
 
+    @property
+    def http(self):
+        if self._http is None:
+            if CONF.service_available.glance:
+                self._http = self._get_http()
+        return self._http
+
     def create_image(self, name, container_format, disk_format, **kwargs):
         params = {
             "name": name,
diff --git a/tempest/services/image/v2/json/image_client.py b/tempest/services/image/v2/json/image_client.py
index 0c4fb5c..38aef2d 100644
--- a/tempest/services/image/v2/json/image_client.py
+++ b/tempest/services/image/v2/json/image_client.py
@@ -28,19 +28,15 @@
 
 class ImageClientV2JSON(rest_client.RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ImageClientV2JSON, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ImageClientV2JSON, self).__init__(auth_provider)
         self.service = CONF.images.catalog_type
-        if CONF.service_available.glance:
-            self.http = self._get_http()
+        self._http = None
 
     def _get_http(self):
-        token, endpoint = self.keystone_auth(self.user, self.password,
-                                             self.auth_url, self.service,
-                                             self.tenant_name)
         dscv = CONF.identity.disable_ssl_certificate_validation
-        return glance_http.HTTPClient(endpoint=endpoint, token=token,
+        return glance_http.HTTPClient(auth_provider=self.auth_provider,
+                                      filters=self.filters,
                                       insecure=dscv)
 
     def get_images_schema(self):
@@ -65,6 +61,13 @@
 
         jsonschema.validate(body, schema)
 
+    @property
+    def http(self):
+        if self._http is None:
+            if CONF.service_available.glance:
+                self._http = self._get_http()
+        return self._http
+
     def create_image(self, name, container_format, disk_format, **kwargs):
         params = {
             "name": name,
diff --git a/tempest/services/network/json/network_client.py b/tempest/services/network/json/network_client.py
index 9908816..1458c7b 100644
--- a/tempest/services/network/json/network_client.py
+++ b/tempest/services/network/json/network_client.py
@@ -31,9 +31,8 @@
     quotas
     """
 
-    def get_rest_client(self, username,
-                        password, auth_url, tenant_name=None):
-        return RestClient(username, password, auth_url, tenant_name)
+    def get_rest_client(self, auth_provider):
+        return RestClient(auth_provider)
 
     def deserialize_single(self, body):
         return json.loads(body)
diff --git a/tempest/services/network/network_client_base.py b/tempest/services/network/network_client_base.py
index 467256e..96b9b1d 100644
--- a/tempest/services/network/network_client_base.py
+++ b/tempest/services/network/network_client_base.py
@@ -46,16 +46,14 @@
 
 
 class NetworkClientBase(object):
-    def __init__(self, username, password,
-                 auth_url, tenant_name=None):
+    def __init__(self, auth_provider):
         self.rest_client = self.get_rest_client(
-            username, password, auth_url, tenant_name)
+            auth_provider)
         self.rest_client.service = CONF.network.catalog_type
         self.version = '2.0'
         self.uri_prefix = "v%s" % (self.version)
 
-    def get_rest_client(self, username, password,
-                        auth_url, tenant_name):
+    def get_rest_client(self, auth_provider):
         raise NotImplementedError
 
     def post(self, uri, body, headers=None):
diff --git a/tempest/services/network/xml/network_client.py b/tempest/services/network/xml/network_client.py
index 4eb38be..720c842 100644
--- a/tempest/services/network/xml/network_client.py
+++ b/tempest/services/network/xml/network_client.py
@@ -28,10 +28,8 @@
     PLURALS = ['dns_nameservers', 'host_routes', 'allocation_pools',
                'fixed_ips', 'extensions']
 
-    def get_rest_client(self, username, password,
-                        auth_url, tenant_name=None):
-        return RestClientXML(username, password,
-                             auth_url, tenant_name)
+    def get_rest_client(self, auth_provider):
+        return RestClientXML(auth_provider)
 
     def _parse_array(self, node):
         array = []
diff --git a/tempest/services/object_storage/account_client.py b/tempest/services/object_storage/account_client.py
index 28d10aa..924d9a8 100644
--- a/tempest/services/object_storage/account_client.py
+++ b/tempest/services/object_storage/account_client.py
@@ -25,12 +25,15 @@
 
 
 class AccountClient(RestClient):
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(AccountClient, self).__init__(username, password,
-                                            auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(AccountClient, self).__init__(auth_provider)
         self.service = CONF.object_storage.catalog_type
         self.format = 'json'
 
+    @property
+    def token(self):
+        return self.auth_provider.auth_data[0]
+
     def create_account(self, data=None,
                        params=None,
                        metadata={},
@@ -128,20 +131,20 @@
         return resp, body
 
     def list_extensions(self):
-        _base_url = self.base_url
-        self.base_url = "/".join(self.base_url.split("/")[:-2])
+        self.skip_path()
         resp, body = self.get('info')
-        self.base_url = _base_url
+        self.reset_path()
         body = json.loads(body)
         return resp, body
 
 
 class AccountClientCustomizedHeader(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(AccountClientCustomizedHeader, self).__init__(username,
-                                                            password, auth_url,
-                                                            tenant_name)
+    # TODO(andreaf) This class is now redundant, to be removed in next patch
+
+    def __init__(self, auth_provider):
+        super(AccountClientCustomizedHeader, self).__init__(
+            auth_provider)
         # Overwrites json-specific header encoding in RestClient
         self.service = CONF.object_storage.catalog_type
         self.format = 'json'
@@ -151,14 +154,17 @@
         self.http_obj = http.ClosingHttp()
         if headers is None:
             headers = {}
-        if self.base_url is None:
-            self._set_auth()
 
-        req_url = "%s/%s" % (self.base_url, url)
-
+        # Authorize the request
+        req_url, req_headers, req_body = self.auth_provider.auth_request(
+            method=method, url=url, headers=headers, body=body,
+            filters=self.filters
+        )
         self._log_request(method, req_url, headers, body)
+        # use original body
         resp, resp_body = self.http_obj.request(req_url, method,
-                                                headers=headers, body=body)
+                                                headers=req_headers,
+                                                body=req_body)
         self._log_response(resp, resp_body)
 
         if resp.status == 401 or resp.status == 403:
diff --git a/tempest/services/object_storage/container_client.py b/tempest/services/object_storage/container_client.py
index bc85c73..63a6460 100644
--- a/tempest/services/object_storage/container_client.py
+++ b/tempest/services/object_storage/container_client.py
@@ -24,15 +24,18 @@
 
 
 class ContainerClient(RestClient):
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ContainerClient, self).__init__(username, password,
-                                              auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ContainerClient, self).__init__(auth_provider)
 
         # Overwrites json-specific header encoding in RestClient
         self.headers = {}
         self.service = CONF.object_storage.catalog_type
         self.format = 'json'
 
+    @property
+    def token(self):
+        return self.auth_provider.auth_data[0]
+
     def create_container(
             self, container_name,
             metadata=None,
diff --git a/tempest/services/object_storage/object_client.py b/tempest/services/object_storage/object_client.py
index 2a68a4f..ca4f1c1 100644
--- a/tempest/services/object_storage/object_client.py
+++ b/tempest/services/object_storage/object_client.py
@@ -24,9 +24,8 @@
 
 
 class ObjectClient(RestClient):
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ObjectClient, self).__init__(username, password,
-                                           auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ObjectClient, self).__init__(auth_provider)
 
         self.service = CONF.object_storage.catalog_type
 
@@ -138,10 +137,11 @@
 
 class ObjectClientCustomizedHeader(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ObjectClientCustomizedHeader, self).__init__(username,
-                                                           password, auth_url,
-                                                           tenant_name)
+    # TODO(andreaf) This class is now redundant, to be removed in next patch
+
+    def __init__(self, auth_provider):
+        super(ObjectClientCustomizedHeader, self).__init__(
+            auth_provider)
         # Overwrites json-specific header encoding in RestClient
         self.service = CONF.object_storage.catalog_type
         self.format = 'json'
@@ -153,13 +153,17 @@
             disable_ssl_certificate_validation=dscv)
         if headers is None:
             headers = {}
-        if self.base_url is None:
-            self._set_auth()
 
-        req_url = "%s/%s" % (self.base_url, url)
+        # Authorize the request
+        req_url, req_headers, req_body = self.auth_provider.auth_request(
+            method=method, url=url, headers=headers, body=body,
+            filters=self.filters
+        )
+        # Use original method
         self._log_request(method, req_url, headers, body)
         resp, resp_body = self.http_obj.request(req_url, method,
-                                                headers=headers, body=body)
+                                                headers=req_headers,
+                                                body=req_body)
         self._log_response(resp, resp_body)
         if resp.status == 401 or resp.status == 403:
             raise exceptions.Unauthorized()
diff --git a/tempest/services/orchestration/json/orchestration_client.py b/tempest/services/orchestration/json/orchestration_client.py
index 273c2ae..0a16b9f 100644
--- a/tempest/services/orchestration/json/orchestration_client.py
+++ b/tempest/services/orchestration/json/orchestration_client.py
@@ -27,9 +27,8 @@
 
 class OrchestrationClient(rest_client.RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(OrchestrationClient, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(OrchestrationClient, self).__init__(auth_provider)
         self.service = CONF.orchestration.catalog_type
         self.build_interval = CONF.orchestration.build_interval
         self.build_timeout = CONF.orchestration.build_timeout
diff --git a/tempest/services/telemetry/json/telemetry_client.py b/tempest/services/telemetry/json/telemetry_client.py
index a1112da..747d7c1 100644
--- a/tempest/services/telemetry/json/telemetry_client.py
+++ b/tempest/services/telemetry/json/telemetry_client.py
@@ -20,9 +20,8 @@
 
 class TelemetryClientJSON(client.TelemetryClientBase):
 
-    def get_rest_client(self, username,
-                        password, auth_url, tenant_name=None):
-        return RestClient(username, password, auth_url, tenant_name)
+    def get_rest_client(self, auth_provider):
+        return RestClient(auth_provider)
 
     def deserialize(self, body):
         return json.loads(body.replace("\n", ""))
diff --git a/tempest/services/telemetry/telemetry_client_base.py b/tempest/services/telemetry/telemetry_client_base.py
index 24039c6..200c94a 100644
--- a/tempest/services/telemetry/telemetry_client_base.py
+++ b/tempest/services/telemetry/telemetry_client_base.py
@@ -35,17 +35,15 @@
     statistics
     """
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        self.rest_client = self.get_rest_client(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        self.rest_client = self.get_rest_client(auth_provider)
         self.rest_client.service = CONF.telemetry.catalog_type
         self.headers = self.rest_client.headers
         self.version = '2'
         self.uri_prefix = "v%s" % self.version
 
     @abc.abstractmethod
-    def get_rest_client(self, username, password,
-                        auth_url, tenant_name):
+    def get_rest_client(self, auth_provider):
         """
         :param config:
         :param username:
diff --git a/tempest/services/telemetry/xml/telemetry_client.py b/tempest/services/telemetry/xml/telemetry_client.py
index 862d08f..f29fe22 100644
--- a/tempest/services/telemetry/xml/telemetry_client.py
+++ b/tempest/services/telemetry/xml/telemetry_client.py
@@ -23,9 +23,8 @@
 
 class TelemetryClientXML(client.TelemetryClientBase):
 
-    def get_rest_client(self, username,
-                        password, auth_url, tenant_name=None):
-        return RestClientXML(username, password, auth_url, tenant_name)
+    def get_rest_client(self, auth_provider):
+        return RestClientXML(auth_provider)
 
     def _parse_array(self, body):
         array = []
diff --git a/tempest/services/volume/json/admin/volume_hosts_client.py b/tempest/services/volume/json/admin/volume_hosts_client.py
index e4178b9..6efb258 100644
--- a/tempest/services/volume/json/admin/volume_hosts_client.py
+++ b/tempest/services/volume/json/admin/volume_hosts_client.py
@@ -27,9 +27,8 @@
     Client class to send CRUD Volume Hosts API requests to a Cinder endpoint
     """
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VolumeHostsClientJSON, self).__init__(username, password,
-                                                    auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(VolumeHostsClientJSON, self).__init__(auth_provider)
 
         self.service = CONF.volume.catalog_type
         self.build_interval = CONF.volume.build_interval
diff --git a/tempest/services/volume/json/admin/volume_types_client.py b/tempest/services/volume/json/admin/volume_types_client.py
index 5b6328b..653532e 100644
--- a/tempest/services/volume/json/admin/volume_types_client.py
+++ b/tempest/services/volume/json/admin/volume_types_client.py
@@ -27,9 +27,8 @@
     Client class to send CRUD Volume Types API requests to a Cinder endpoint
     """
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VolumeTypesClientJSON, self).__init__(username, password,
-                                                    auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(VolumeTypesClientJSON, self).__init__(auth_provider)
 
         self.service = CONF.volume.catalog_type
         self.build_interval = CONF.volume.build_interval
diff --git a/tempest/services/volume/json/extensions_client.py b/tempest/services/volume/json/extensions_client.py
index c3bbb20..257b7c8 100644
--- a/tempest/services/volume/json/extensions_client.py
+++ b/tempest/services/volume/json/extensions_client.py
@@ -23,9 +23,8 @@
 
 class ExtensionsClientJSON(RestClient):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ExtensionsClientJSON, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ExtensionsClientJSON, self).__init__(auth_provider)
         self.service = CONF.volume.catalog_type
 
     def list_extensions(self):
diff --git a/tempest/services/volume/json/snapshots_client.py b/tempest/services/volume/json/snapshots_client.py
index e8926bd..0a79469 100644
--- a/tempest/services/volume/json/snapshots_client.py
+++ b/tempest/services/volume/json/snapshots_client.py
@@ -27,9 +27,8 @@
 class SnapshotsClientJSON(RestClient):
     """Client class to send CRUD Volume API requests."""
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(SnapshotsClientJSON, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(SnapshotsClientJSON, self).__init__(auth_provider)
 
         self.service = CONF.volume.catalog_type
         self.build_interval = CONF.volume.build_interval
diff --git a/tempest/services/volume/json/volumes_client.py b/tempest/services/volume/json/volumes_client.py
index 6c09e02..0524212 100644
--- a/tempest/services/volume/json/volumes_client.py
+++ b/tempest/services/volume/json/volumes_client.py
@@ -29,9 +29,8 @@
     Client class to send CRUD Volume API requests to a Cinder endpoint
     """
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VolumesClientJSON, self).__init__(username, password,
-                                                auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(VolumesClientJSON, self).__init__(auth_provider)
 
         self.service = CONF.volume.catalog_type
         self.build_interval = CONF.volume.build_interval
diff --git a/tempest/services/volume/xml/admin/volume_hosts_client.py b/tempest/services/volume/xml/admin/volume_hosts_client.py
index 39b82e5..7278fd9 100644
--- a/tempest/services/volume/xml/admin/volume_hosts_client.py
+++ b/tempest/services/volume/xml/admin/volume_hosts_client.py
@@ -29,9 +29,8 @@
     Client class to send CRUD Volume Hosts API requests to a Cinder endpoint
     """
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VolumeHostsClientXML, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(VolumeHostsClientXML, self).__init__(auth_provider)
         self.service = CONF.volume.catalog_type
         self.build_interval = CONF.compute.build_interval
         self.build_timeout = CONF.compute.build_timeout
diff --git a/tempest/services/volume/xml/admin/volume_types_client.py b/tempest/services/volume/xml/admin/volume_types_client.py
index 942c4e1..29ba431 100644
--- a/tempest/services/volume/xml/admin/volume_types_client.py
+++ b/tempest/services/volume/xml/admin/volume_types_client.py
@@ -34,9 +34,8 @@
     Client class to send CRUD Volume Types API requests to a Cinder endpoint
     """
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VolumeTypesClientXML, self).__init__(username, password,
-                                                   auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(VolumeTypesClientXML, self).__init__(auth_provider)
         self.service = CONF.volume.catalog_type
         self.build_interval = CONF.compute.build_interval
         self.build_timeout = CONF.compute.build_timeout
diff --git a/tempest/services/volume/xml/extensions_client.py b/tempest/services/volume/xml/extensions_client.py
index a04616d..21e1d04 100644
--- a/tempest/services/volume/xml/extensions_client.py
+++ b/tempest/services/volume/xml/extensions_client.py
@@ -24,9 +24,8 @@
 
 class ExtensionsClientXML(RestClientXML):
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(ExtensionsClientXML, self).__init__(username, password,
-                                                  auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(ExtensionsClientXML, self).__init__(auth_provider)
         self.service = CONF.volume.catalog_type
 
     def _parse_array(self, node):
diff --git a/tempest/services/volume/xml/snapshots_client.py b/tempest/services/volume/xml/snapshots_client.py
index 5e62b6d..4f066a6 100644
--- a/tempest/services/volume/xml/snapshots_client.py
+++ b/tempest/services/volume/xml/snapshots_client.py
@@ -33,9 +33,8 @@
 class SnapshotsClientXML(RestClientXML):
     """Client class to send CRUD Volume API requests."""
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(SnapshotsClientXML, self).__init__(username, password,
-                                                 auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(SnapshotsClientXML, self).__init__(auth_provider)
 
         self.service = CONF.volume.catalog_type
         self.build_interval = CONF.volume.build_interval
diff --git a/tempest/services/volume/xml/volumes_client.py b/tempest/services/volume/xml/volumes_client.py
index 7adaf4b..deb56fd 100644
--- a/tempest/services/volume/xml/volumes_client.py
+++ b/tempest/services/volume/xml/volumes_client.py
@@ -35,9 +35,8 @@
     Client class to send CRUD Volume API requests to a Cinder endpoint
     """
 
-    def __init__(self, username, password, auth_url, tenant_name=None):
-        super(VolumesClientXML, self).__init__(username, password,
-                                               auth_url, tenant_name)
+    def __init__(self, auth_provider):
+        super(VolumesClientXML, self).__init__(auth_provider)
         self.service = CONF.volume.catalog_type
         self.build_interval = CONF.compute.build_interval
         self.build_timeout = CONF.compute.build_timeout
diff --git a/tempest/tests/fake_auth_provider.py b/tempest/tests/fake_auth_provider.py
new file mode 100644
index 0000000..bc68d26
--- /dev/null
+++ b/tempest/tests/fake_auth_provider.py
@@ -0,0 +1,20 @@
+# Copyright 2014 Hewlett-Packard Development Company, L.P.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+
+class FakeAuthProvider(object):
+
+    def auth_request(self, method, url, headers=None, body=None, filters=None):
+        return url, headers, body
diff --git a/tempest/tests/test_rest_client.py b/tempest/tests/test_rest_client.py
index f3c7440..ead112b 100644
--- a/tempest/tests/test_rest_client.py
+++ b/tempest/tests/test_rest_client.py
@@ -19,23 +19,24 @@
 from tempest import exceptions
 from tempest.openstack.common.fixture import mockpatch
 from tempest.tests import base
+from tempest.tests import fake_auth_provider
 from tempest.tests import fake_config
 from tempest.tests import fake_http
 
 
 class BaseRestClientTestClass(base.TestCase):
 
-    def _set_token(self):
-        self.rest_client.token = 'fake token'
+    def _get_region(self):
+        return 'fake region'
 
     def setUp(self):
         super(BaseRestClientTestClass, self).setUp()
         self.stubs.Set(config, 'TempestConfigPrivate', fake_config.FakeConfig)
-        self.rest_client = rest_client.RestClient('fake_user', 'fake_pass',
-                                                  'http://fake_url/v2.0')
+        self.rest_client = rest_client.RestClient(
+            fake_auth_provider.FakeAuthProvider())
         self.stubs.Set(httplib2.Http, 'request', self.fake_http.request)
-        self.useFixture(mockpatch.PatchObject(self.rest_client, '_set_auth',
-                                              side_effect=self._set_token()))
+        self.useFixture(mockpatch.PatchObject(self.rest_client, '_get_region',
+                                              side_effect=self._get_region()))
         self.useFixture(mockpatch.PatchObject(self.rest_client,
                                               '_log_response'))
 
diff --git a/tools/verify_tempest_config.py b/tools/verify_tempest_config.py
index 913c90b..29eed9d 100755
--- a/tools/verify_tempest_config.py
+++ b/tools/verify_tempest_config.py
@@ -40,12 +40,12 @@
 
 
 def verify_nova_api_versions(os):
-    # Check nova api versions
-    os.servers_client._set_auth()
-    v2_endpoint = os.servers_client.base_url
-    endpoint = 'http://' + v2_endpoint.split('/')[2]
-    __, body = RAW_HTTP.request(endpoint, 'GET')
+    # Check nova api versions - only get base URL without PATH
+    os.servers_client.skip_path = True
+    __, body = RAW_HTTP.request(os.servers_client.base_url, 'GET')
     body = json.loads(body)
+    # Restore full base_url
+    os.servers_client.skip_path = False
     versions = map(lambda x: x['id'], body['versions'])
     if CONF.compute_feature_enabled.api_v3 != ('v3.0' in versions):
         print('Config option compute api_v3 should be change to: %s' % (