Switch to oslo privsep

Please reference here:
https://docs.openstack.org/oslo.privsep/latest/user/index.html#converting-from-rootwrap-to-privsep

Change-Id: I5db0e64ec38d912f907b4ad483562120d030d726

ceilometer/cmd/polling.py

@@ -14,13 +14,17 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+import shlex
+
 import cotyledon
 from cotyledon import oslo_config_glue
 from oslo_config import cfg
 from oslo_log import log
+from oslo_privsep import priv_context
 
 from ceilometer.polling import manager
 from ceilometer import service
+from ceilometer import utils
 
 LOG = log.getLogger(__name__)
 
@@ -78,6 +82,7 @@ def main():
     conf = cfg.ConfigOpts()
     conf.register_cli_opts(CLI_OPTS)
     service.prepare_service(conf=conf)
+    priv_context.init(root_helper=shlex.split(utils._get_root_helper()))
     sm = cotyledon.ServiceManager()
     sm.add(create_polling_service, args=(conf,))
     oslo_config_glue.setup(sm, conf)

ceilometer/ipmi/platform/ipmitool.py

@@ -17,7 +17,8 @@ from oslo_concurrency import processutils
 
 from ceilometer.i18n import _
 from ceilometer.ipmi.platform import exception as ipmiexcept
-from ceilometer import utils
+
+import ceilometer.privsep.ipmitool
 
 
 # Following 2 functions are copied from ironic project to handle ipmitool's
@@ -123,7 +124,7 @@ def execute_ipmi_cmd(template=None):
             command = f(self, **kwargs)
             args.extend(command.split(" "))
             try:
-                (out, __) = utils.execute(*args, run_as_root=True)
+                (out, __) = ceilometer.privsep.ipmitool.ipmi(*args)
             except processutils.ProcessExecutionError:
                 raise ipmiexcept.IPMIException(_("running ipmitool failure"))
             return _parse_output(out, template)

ceilometer/privsep/__init__.py

@@ -0,0 +1,29 @@
+#
+#    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.
+
+"""Setup privsep decorator."""
+
+from oslo_privsep import capabilities
+from oslo_privsep import priv_context
+
+sys_admin_pctxt = priv_context.PrivContext(
+    'ceilometer',
+    cfg_section='ceilometer_sys_admin',
+    pypath=__name__ + '.sys_admin_pctxt',
+    capabilities=[capabilities.CAP_CHOWN,
+                  capabilities.CAP_DAC_OVERRIDE,
+                  capabilities.CAP_DAC_READ_SEARCH,
+                  capabilities.CAP_FOWNER,
+                  capabilities.CAP_NET_ADMIN,
+                  capabilities.CAP_SYS_ADMIN],
+)

ceilometer/privsep/ipmitool.py

@@ -0,0 +1,25 @@
+#
+#    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.
+
+"""
+Helpers for impi related routines.
+"""
+
+from oslo_concurrency import processutils
+
+import ceilometer.privsep
+
+
+@ceilometer.privsep.sys_admin_pctxt.entrypoint
+def ipmi(*cmd):
+    processutils.execute(*cmd)

ceilometer/tests/unit/ipmi/platform/test_intel_node_manager.py

@@ -20,9 +20,9 @@ from oslotest import base
 import six
 
 from ceilometer.ipmi.platform import intel_node_manager as node_manager
+from ceilometer.privsep import ipmitool
 from ceilometer import service
 from ceilometer.tests.unit.ipmi.platform import fake_utils
-from ceilometer import utils
 
 
 @six.add_metaclass(abc.ABCMeta)
@@ -56,7 +56,7 @@ class _Base(base.BaseTestCase):
 class TestNodeManagerV3(_Base):
 
     def init_test_engine(self):
-        utils.execute = mock.Mock(side_effect=fake_utils.execute_with_nm_v3)
+        ipmitool.ipmi = mock.Mock(side_effect=fake_utils.execute_with_nm_v3)
 
     def test_read_airflow(self):
         airflow = self.nm.read_airflow()
@@ -110,7 +110,7 @@ class TestNodeManagerV3(_Base):
 class TestNodeManager(_Base):
 
     def init_test_engine(self):
-        utils.execute = mock.Mock(side_effect=fake_utils.execute_with_nm_v2)
+        ipmitool.ipmi = mock.Mock(side_effect=fake_utils.execute_with_nm_v2)
 
     def test_read_power_all(self):
         power = self.nm.read_power_all()
@@ -162,7 +162,7 @@ class TestNodeManager(_Base):
 class TestNonNodeManager(_Base):
 
     def init_test_engine(self):
-        utils.execute = mock.Mock(side_effect=fake_utils.execute_without_nm)
+        ipmitool.ipmi = mock.Mock(side_effect=fake_utils.execute_without_nm)
 
     def test_read_power_all(self):
         # no NM support

ceilometer/tests/unit/ipmi/platform/test_ipmi_sensor.py

@@ -16,8 +16,8 @@ import mock
 from oslotest import base
 
 from ceilometer.ipmi.platform import ipmi_sensor
+from ceilometer.privsep import ipmitool
 from ceilometer.tests.unit.ipmi.platform import fake_utils
-from ceilometer import utils
 
 
 class TestIPMISensor(base.BaseTestCase):
@@ -25,7 +25,7 @@ class TestIPMISensor(base.BaseTestCase):
     def setUp(self):
         super(TestIPMISensor, self).setUp()
 
-        utils.execute = mock.Mock(side_effect=fake_utils.execute_with_nm_v2)
+        ipmitool.ipmi = mock.Mock(side_effect=fake_utils.execute_with_nm_v2)
         self.ipmi = ipmi_sensor.IPMISensor()
 
     @classmethod
@@ -93,7 +93,7 @@ class TestNonIPMISensor(base.BaseTestCase):
     def setUp(self):
         super(TestNonIPMISensor, self).setUp()
 
-        utils.execute = mock.Mock(side_effect=fake_utils.execute_without_ipmi)
+        ipmitool.ipmi = mock.Mock(side_effect=fake_utils.execute_without_ipmi)
         self.ipmi = ipmi_sensor.IPMISensor()
 
     @classmethod

ceilometer/utils.py

@@ -20,7 +20,6 @@
 
 import threading
 
-from oslo_concurrency import processutils
 from oslo_config import cfg
 
 ROOTWRAP_CONF = "/etc/ceilometer/rootwrap.conf"
@@ -43,13 +42,6 @@ def setup_root_helper(conf):
     ROOTWRAP_CONF = conf.rootwrap_config
 
 
-def execute(*cmd, **kwargs):
-    """Convenience wrapper around oslo's execute() method."""
-    if 'run_as_root' in kwargs and 'root_helper' not in kwargs:
-        kwargs['root_helper'] = _get_root_helper()
-    return processutils.execute(*cmd, **kwargs)
-
-
 def spawn_thread(target, *args, **kwargs):
     t = threading.Thread(target=target, args=args, kwargs=kwargs)
     t.daemon = True

etc/ceilometer/rootwrap.d/ipmi.filters

@@ -2,6 +2,4 @@
 # This file should be owned by (and only-writeable by) the root user
 
 [Filters]
-# ceilometer/ipmi/platform/ipmitool.py: 'ipmitool'
+privsep-rootwrap-sys_admin: RegExpFilter, privsep-helper, root, privsep-helper, --config-file, /etc/(?!\.\.).*, --privsep_context, ceilometer.privsep.sys_admin_pctxt, --privsep_sock_path, /tmp/.*
-ipmitool: CommandFilter, ipmitool, root
-

lower-constraints.txt

@@ -21,6 +21,7 @@ oslo.i18n==3.15.3
 oslo.log==3.36.0
 oslo.messaging==6.2.0
 oslo.messaging[kafka]==6.2.0
+oslo.privsep==1.32.0
 oslo.reports==1.18.0
 oslo.rootwrap==2.0.0
 oslo.utils==3.37.0

releasenotes/notes/switch-to-oslo-privsep-b58f20a279f31bc0.yaml

@@ -0,0 +1,15 @@
+---
+security:
+  - |
+    Privsep transitions. Ceilometer is transitioning from using the older
+    style rootwrap privilege escalation path to the new style Oslo privsep
+    path. This should improve performance and security of Ceilometer
+    in the long term.
+  - |
+    Privsep daemons are now started by Ceilometer when required. These
+    daemons can be started via rootwrap if required. rootwrap configs
+    therefore need to be updated to include new privsep daemon invocations.
+upgrade:
+  - |
+    The following commands are no longer required to be listed in your rootwrap
+    configuration: ipmitool.

requirements.txt

@@ -19,6 +19,7 @@ oslo.rootwrap>=2.0.0 # Apache-2.0
 pbr>=2.0.0 # Apache-2.0
 oslo.messaging>=6.2.0 # Apache-2.0
 oslo.utils>=3.37.0 # Apache-2.0
+oslo.privsep>=1.32.0 # Apache-2.0
 pysnmp<5.0.0,>=4.2.3 # BSD
 python-glanceclient>=2.8.0 # Apache-2.0
 python-keystoneclient>=3.15.0 # Apache-2.0