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# Copyright 2016 Canonical Limited.
#
# 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.
from subprocess import (
check_output,
CalledProcessError,
)
from charmhelpers.core.hookenv import (
log,
DEBUG,
ERROR,
)
from charmhelpers.fetch import (
apt_install,
apt_purge,
apt_update,
)
from charmhelpers.contrib.hardening.audits.file import (
TemplatedFile,
DeletedFile,
)
from charmhelpers.contrib.hardening import utils
from charmhelpers.contrib.hardening.host import TEMPLATES_DIR
def get_audits():
"""Get OS hardening PAM authentication audits.
:returns: dictionary of audits
"""
audits = []
settings = utils.get_settings('os')
if settings['auth']['pam_passwdqc_enable']:
audits.append(PasswdqcPAM('/etc/passwdqc.conf'))
if settings['auth']['retries']:
audits.append(Tally2PAM('/usr/share/pam-configs/tally2'))
else:
audits.append(DeletedFile('/usr/share/pam-configs/tally2'))
return audits
class PasswdqcPAMContext(object):
def __call__(self):
ctxt = {}
settings = utils.get_settings('os')
ctxt['auth_pam_passwdqc_options'] = \
settings['auth']['pam_passwdqc_options']
return ctxt
class PasswdqcPAM(TemplatedFile):
"""The PAM Audit verifies the linux PAM settings."""
def __init__(self, path):
super(PasswdqcPAM, self).__init__(path=path,
template_dir=TEMPLATES_DIR,
context=PasswdqcPAMContext(),
user='root',
group='root',
mode=0o0640)
def pre_write(self):
# Always remove?
for pkg in ['libpam-ccreds', 'libpam-cracklib']:
log("Purging package '%s'" % pkg, level=DEBUG),
apt_purge(pkg)
apt_update(fatal=True)
for pkg in ['libpam-passwdqc']:
log("Installing package '%s'" % pkg, level=DEBUG),
apt_install(pkg)
def post_write(self):
"""Updates the PAM configuration after the file has been written"""
try:
check_output(['pam-auth-update', '--package'])
except CalledProcessError as e:
log('Error calling pam-auth-update: %s' % e, level=ERROR)
class Tally2PAMContext(object):
def __call__(self):
ctxt = {}
settings = utils.get_settings('os')
ctxt['auth_lockout_time'] = settings['auth']['lockout_time']
ctxt['auth_retries'] = settings['auth']['retries']
return ctxt
class Tally2PAM(TemplatedFile):
"""The PAM Audit verifies the linux PAM settings."""
def __init__(self, path):
super(Tally2PAM, self).__init__(path=path,
template_dir=TEMPLATES_DIR,
context=Tally2PAMContext(),
user='root',
group='root',
mode=0o0640)
def pre_write(self):
# Always remove?
apt_purge('libpam-ccreds')
apt_update(fatal=True)
apt_install('libpam-modules')
def post_write(self):
"""Updates the PAM configuration after the file has been written"""
try:
check_output(['pam-auth-update', '--package'])
except CalledProcessError as e:
log('Error calling pam-auth-update: %s' % e, level=ERROR)
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