132 lines
5.0 KiB
Python
132 lines
5.0 KiB
Python
# Copyright 2016 Canonical Limited.
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#
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# This file is part of charm-helpers.
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#
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# charm-helpers is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3 as
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# published by the Free Software Foundation.
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#
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# charm-helpers is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with charm-helpers. If not, see <http://www.gnu.org/licenses/>.
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import subprocess
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from charmhelpers.core.hookenv import (
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log,
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INFO,
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)
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from charmhelpers.contrib.hardening.audits.file import NoSUIDSGIDAudit
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from charmhelpers.contrib.hardening import utils
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BLACKLIST = ['/usr/bin/rcp', '/usr/bin/rlogin', '/usr/bin/rsh',
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'/usr/libexec/openssh/ssh-keysign',
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'/usr/lib/openssh/ssh-keysign',
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'/sbin/netreport',
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'/usr/sbin/usernetctl',
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'/usr/sbin/userisdnctl',
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'/usr/sbin/pppd',
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'/usr/bin/lockfile',
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'/usr/bin/mail-lock',
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'/usr/bin/mail-unlock',
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'/usr/bin/mail-touchlock',
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'/usr/bin/dotlockfile',
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'/usr/bin/arping',
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'/usr/sbin/uuidd',
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'/usr/bin/mtr',
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'/usr/lib/evolution/camel-lock-helper-1.2',
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'/usr/lib/pt_chown',
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'/usr/lib/eject/dmcrypt-get-device',
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'/usr/lib/mc/cons.saver']
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WHITELIST = ['/bin/mount', '/bin/ping', '/bin/su', '/bin/umount',
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'/sbin/pam_timestamp_check', '/sbin/unix_chkpwd', '/usr/bin/at',
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'/usr/bin/gpasswd', '/usr/bin/locate', '/usr/bin/newgrp',
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'/usr/bin/passwd', '/usr/bin/ssh-agent',
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'/usr/libexec/utempter/utempter', '/usr/sbin/lockdev',
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'/usr/sbin/sendmail.sendmail', '/usr/bin/expiry',
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'/bin/ping6', '/usr/bin/traceroute6.iputils',
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'/sbin/mount.nfs', '/sbin/umount.nfs',
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'/sbin/mount.nfs4', '/sbin/umount.nfs4',
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'/usr/bin/crontab',
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'/usr/bin/wall', '/usr/bin/write',
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'/usr/bin/screen',
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'/usr/bin/mlocate',
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'/usr/bin/chage', '/usr/bin/chfn', '/usr/bin/chsh',
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'/bin/fusermount',
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'/usr/bin/pkexec',
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'/usr/bin/sudo', '/usr/bin/sudoedit',
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'/usr/sbin/postdrop', '/usr/sbin/postqueue',
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'/usr/sbin/suexec',
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'/usr/lib/squid/ncsa_auth', '/usr/lib/squid/pam_auth',
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'/usr/kerberos/bin/ksu',
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'/usr/sbin/ccreds_validate',
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'/usr/bin/Xorg',
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'/usr/bin/X',
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'/usr/lib/dbus-1.0/dbus-daemon-launch-helper',
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'/usr/lib/vte/gnome-pty-helper',
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'/usr/lib/libvte9/gnome-pty-helper',
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'/usr/lib/libvte-2.90-9/gnome-pty-helper']
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def get_audits():
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"""Get OS hardening suid/sgid audits.
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:returns: dictionary of audits
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"""
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checks = []
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settings = utils.get_settings('os')
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if not settings['security']['suid_sgid_enforce']:
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log("Skipping suid/sgid hardening", level=INFO)
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return checks
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# Build the blacklist and whitelist of files for suid/sgid checks.
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# There are a total of 4 lists:
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# 1. the system blacklist
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# 2. the system whitelist
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# 3. the user blacklist
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# 4. the user whitelist
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#
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# The blacklist is the set of paths which should NOT have the suid/sgid bit
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# set and the whitelist is the set of paths which MAY have the suid/sgid
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# bit setl. The user whitelist/blacklist effectively override the system
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# whitelist/blacklist.
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u_b = settings['security']['suid_sgid_blacklist']
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u_w = settings['security']['suid_sgid_whitelist']
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blacklist = set(BLACKLIST) - set(u_w + u_b)
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whitelist = set(WHITELIST) - set(u_b + u_w)
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checks.append(NoSUIDSGIDAudit(blacklist))
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dry_run = settings['security']['suid_sgid_dry_run_on_unknown']
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if settings['security']['suid_sgid_remove_from_unknown'] or dry_run:
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# If the policy is a dry_run (e.g. complain only) or remove unknown
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# suid/sgid bits then find all of the paths which have the suid/sgid
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# bit set and then remove the whitelisted paths.
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root_path = settings['environment']['root_path']
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unknown_paths = find_paths_with_suid_sgid(root_path) - set(whitelist)
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checks.append(NoSUIDSGIDAudit(unknown_paths, unless=dry_run))
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return checks
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def find_paths_with_suid_sgid(root_path):
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"""Finds all paths/files which have an suid/sgid bit enabled.
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Starting with the root_path, this will recursively find all paths which
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have an suid or sgid bit set.
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"""
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cmd = ['find', root_path, '-perm', '-4000', '-o', '-perm', '-2000',
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'-type', 'f', '!', '-path', '/proc/*', '-print']
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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out, _ = p.communicate()
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return set(out.split('\n'))
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