1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
#!/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 Nova
Filters which commands nova is allowed to run as another user.
To use this, you should set the following in nova.conf:
root_helper=sudo nova-rootwrap /etc/nova/rootwrap.conf
You also need to let the nova user run nova-rootwrap as root in sudoers:
nova ALL = (root) NOPASSWD: /usr/bin/nova-rootwrap /etc/nova/rootwrap.conf *
To make allowed commands node-specific, your packaging should only
install {compute,network,volume}.filters respectively on compute, network
and volume nodes (i.e. nova-api nodes should not have any of those files
installed).
"""
import ConfigParser
import os
import subprocess
import sys
RC_UNAUTHORIZED = 99
RC_NOCOMMAND = 98
RC_BADCONFIG = 97
if __name__ == '__main__':
# Split arguments, require at least a command
execname = sys.argv.pop(0)
if len(sys.argv) < 2:
print "%s: %s" % (execname, "No command specified")
sys.exit(RC_NOCOMMAND)
configfile = sys.argv.pop(0)
userargs = sys.argv[:]
# Load configuration
config = ConfigParser.RawConfigParser()
config.read(configfile)
try:
filters_path = config.get("DEFAULT", "filters_path").split(",")
except ConfigParser.Error:
print "%s: Incorrect configuration file: %s" % (execname, configfile)
sys.exit(RC_BADCONFIG)
# 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, "nova", "__init__.py")):
sys.path.insert(0, possible_topdir)
from nova.rootwrap import wrapper
# Execute command if it matches any of the loaded filters
filters = wrapper.load_filters(filters_path)
filtermatch = wrapper.match_filter(filters, userargs)
if filtermatch:
obj = subprocess.Popen(filtermatch.get_command(userargs),
stdin=sys.stdin,
stdout=sys.stdout,
stderr=sys.stderr,
env=filtermatch.get_environment(userargs))
obj.wait()
sys.exit(obj.returncode)
print "Unauthorized command: %s" % ' '.join(userargs)
sys.exit(RC_UNAUTHORIZED)
|
