974c29cf5a
Copies current nova-rootwrap code to openstack.common, so that it can be reused by Cinder and Quantum. Implements blueprint common-rootwrap. Before it can be used in projects, update.py needs to grow the capability to deploy files in bin/ and etc/, as well as replacing a placeholder text by the destination project name in source files and binary names. In this proposed version, the placeholder text is "oslo". Change-Id: I8655d5b3cccacd1cc2225aa539339fb478615422
126 lines
4.5 KiB
Python
Executable File
126 lines
4.5 KiB
Python
Executable File
#!/usr/bin/env python
|
|
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright (c) 2011 OpenStack, LLC.
|
|
# 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.
|
|
|
|
"""Root wrapper for OpenStack services
|
|
|
|
Filters which commands a service is allowed to run as another user.
|
|
|
|
To use this with oslo, you should set the following in oslo.conf:
|
|
rootwrap_config=/etc/oslo/rootwrap.conf
|
|
|
|
You also need to let the oslo user run oslo-rootwrap as root in sudoers:
|
|
oslo ALL = (root) NOPASSWD: /usr/bin/oslo-rootwrap /etc/oslo/rootwrap.conf *
|
|
|
|
Service packaging should deploy .filters files only on nodes where they are
|
|
needed, to avoid allowing more than is necessary.
|
|
"""
|
|
|
|
import ConfigParser
|
|
import logging
|
|
import os
|
|
import pwd
|
|
import signal
|
|
import subprocess
|
|
import sys
|
|
|
|
|
|
RC_UNAUTHORIZED = 99
|
|
RC_NOCOMMAND = 98
|
|
RC_BADCONFIG = 97
|
|
RC_NOEXECFOUND = 96
|
|
|
|
|
|
def _subprocess_setup():
|
|
# Python installs a SIGPIPE handler by default. This is usually not what
|
|
# non-Python subprocesses expect.
|
|
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
|
|
|
|
|
|
def _exit_error(execname, message, errorcode, log=True):
|
|
print "%s: %s" % (execname, message)
|
|
if log:
|
|
logging.error(message)
|
|
sys.exit(errorcode)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
# Split arguments, require at least a command
|
|
execname = sys.argv.pop(0)
|
|
if len(sys.argv) < 2:
|
|
_exit_error(execname, "No command specified", RC_NOCOMMAND, log=False)
|
|
|
|
configfile = sys.argv.pop(0)
|
|
userargs = sys.argv[:]
|
|
|
|
# Add ../ to sys.path to allow running from branch
|
|
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(execname),
|
|
os.pardir, os.pardir))
|
|
if os.path.exists(os.path.join(possible_topdir, "oslo", "__init__.py")):
|
|
sys.path.insert(0, possible_topdir)
|
|
|
|
from openstack.common.rootwrap import wrapper
|
|
|
|
# Load configuration
|
|
try:
|
|
rawconfig = ConfigParser.RawConfigParser()
|
|
rawconfig.read(configfile)
|
|
config = wrapper.RootwrapConfig(rawconfig)
|
|
except ValueError as exc:
|
|
msg = "Incorrect value in %s: %s" % (configfile, exc.message)
|
|
_exit_error(execname, msg, RC_BADCONFIG, log=False)
|
|
except ConfigParser.Error:
|
|
_exit_error(execname, "Incorrect configuration file: %s" % configfile,
|
|
RC_BADCONFIG, log=False)
|
|
|
|
if config.use_syslog:
|
|
wrapper.setup_syslog(execname,
|
|
config.syslog_log_facility,
|
|
config.syslog_log_level)
|
|
|
|
# Execute command if it matches any of the loaded filters
|
|
filters = wrapper.load_filters(config.filters_path)
|
|
try:
|
|
filtermatch = wrapper.match_filter(filters, userargs,
|
|
exec_dirs=config.exec_dirs)
|
|
if filtermatch:
|
|
command = filtermatch.get_command(userargs,
|
|
exec_dirs=config.exec_dirs)
|
|
if config.use_syslog:
|
|
logging.info("(%s > %s) Executing %s (filter match = %s)" % (
|
|
os.getlogin(), pwd.getpwuid(os.getuid())[0],
|
|
command, filtermatch.name))
|
|
|
|
obj = subprocess.Popen(command,
|
|
stdin=sys.stdin,
|
|
stdout=sys.stdout,
|
|
stderr=sys.stderr,
|
|
preexec_fn=_subprocess_setup,
|
|
env=filtermatch.get_environment(userargs))
|
|
obj.wait()
|
|
sys.exit(obj.returncode)
|
|
|
|
except wrapper.FilterMatchNotExecutable as exc:
|
|
msg = ("Executable not found: %s (filter match = %s)"
|
|
% (exc.match.exec_path, exc.match.name))
|
|
_exit_error(execname, msg, RC_NOEXECFOUND, log=config.use_syslog)
|
|
|
|
except wrapper.NoFilterMatched:
|
|
msg = ("Unauthorized command: %s (no filter matched)"
|
|
% ' '.join(userargs))
|
|
_exit_error(execname, msg, RC_UNAUTHORIZED, log=config.use_syslog)
|