95 lines
3.2 KiB
Python
Executable File
95 lines
3.2 KiB
Python
Executable File
#!/usr/bin/env python
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2011 OpenStack, LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Root wrapper for Nova
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Filters which commands nova is allowed to run as another user.
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To use this, you should set the following in nova.conf:
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rootwrap_config=/etc/nova/rootwrap.conf
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You also need to let the nova user run nova-rootwrap as root in sudoers:
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nova ALL = (root) NOPASSWD: /usr/bin/nova-rootwrap /etc/nova/rootwrap.conf *
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To make allowed commands node-specific, your packaging should only
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install {compute,network,volume}.filters respectively on compute, network
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and volume nodes (i.e. nova-api nodes should not have any of those files
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installed).
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"""
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import ConfigParser
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import os
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import signal
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import subprocess
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import sys
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RC_UNAUTHORIZED = 99
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RC_NOCOMMAND = 98
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RC_BADCONFIG = 97
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def _subprocess_setup():
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# Python installs a SIGPIPE handler by default. This is usually not what
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# non-Python subprocesses expect.
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signal.signal(signal.SIGPIPE, signal.SIG_DFL)
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if __name__ == '__main__':
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# Split arguments, require at least a command
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execname = sys.argv.pop(0)
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if len(sys.argv) < 2:
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print "%s: %s" % (execname, "No command specified")
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sys.exit(RC_NOCOMMAND)
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configfile = sys.argv.pop(0)
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userargs = sys.argv[:]
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# Load configuration
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config = ConfigParser.RawConfigParser()
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config.read(configfile)
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try:
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filters_path = config.get("DEFAULT", "filters_path").split(",")
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except ConfigParser.Error:
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print "%s: Incorrect configuration file: %s" % (execname, configfile)
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sys.exit(RC_BADCONFIG)
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# Add ../ to sys.path to allow running from branch
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possible_topdir = os.path.normpath(os.path.join(os.path.abspath(execname),
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os.pardir, os.pardir))
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if os.path.exists(os.path.join(possible_topdir, "nova", "__init__.py")):
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sys.path.insert(0, possible_topdir)
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from nova.rootwrap import wrapper
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# Execute command if it matches any of the loaded filters
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filters = wrapper.load_filters(filters_path)
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filtermatch = wrapper.match_filter(filters, userargs)
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if filtermatch:
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obj = subprocess.Popen(filtermatch.get_command(userargs),
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stdin=sys.stdin,
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stdout=sys.stdout,
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stderr=sys.stderr,
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preexec_fn=_subprocess_setup,
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env=filtermatch.get_environment(userargs))
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obj.wait()
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sys.exit(obj.returncode)
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print "Unauthorized command: %s" % ' '.join(userargs)
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sys.exit(RC_UNAUTHORIZED)
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