4b98e30307
Add charmhelpers.contrib.hardening and calls to install, config-changed, upgrade-charm and update-status hooks. Also add new config option to allow one or more hardening modules to be applied at runtime. Change-Id: Icf48829e010d35d7d7a4ccd547eae6a8c511c04e
135 lines
4.0 KiB
Python
135 lines
4.0 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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from subprocess import (
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check_output,
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CalledProcessError,
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)
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from charmhelpers.core.hookenv import (
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log,
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DEBUG,
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ERROR,
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)
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from charmhelpers.fetch import (
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apt_install,
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apt_purge,
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apt_update,
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)
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from charmhelpers.contrib.hardening.audits.file import (
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TemplatedFile,
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DeletedFile,
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)
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from charmhelpers.contrib.hardening import utils
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from charmhelpers.contrib.hardening.host import TEMPLATES_DIR
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def get_audits():
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"""Get OS hardening PAM authentication audits.
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:returns: dictionary of audits
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"""
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audits = []
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settings = utils.get_settings('os')
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if settings['auth']['pam_passwdqc_enable']:
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audits.append(PasswdqcPAM('/etc/passwdqc.conf'))
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if settings['auth']['retries']:
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audits.append(Tally2PAM('/usr/share/pam-configs/tally2'))
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else:
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audits.append(DeletedFile('/usr/share/pam-configs/tally2'))
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return audits
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class PasswdqcPAMContext(object):
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def __call__(self):
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ctxt = {}
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settings = utils.get_settings('os')
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ctxt['auth_pam_passwdqc_options'] = \
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settings['auth']['pam_passwdqc_options']
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return ctxt
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class PasswdqcPAM(TemplatedFile):
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"""The PAM Audit verifies the linux PAM settings."""
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def __init__(self, path):
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super(PasswdqcPAM, self).__init__(path=path,
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template_dir=TEMPLATES_DIR,
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context=PasswdqcPAMContext(),
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user='root',
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group='root',
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mode=0o0640)
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def pre_write(self):
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# Always remove?
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for pkg in ['libpam-ccreds', 'libpam-cracklib']:
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log("Purging package '%s'" % pkg, level=DEBUG),
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apt_purge(pkg)
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apt_update(fatal=True)
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for pkg in ['libpam-passwdqc']:
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log("Installing package '%s'" % pkg, level=DEBUG),
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apt_install(pkg)
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def post_write(self):
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"""Updates the PAM configuration after the file has been written"""
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try:
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check_output(['pam-auth-update', '--package'])
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except CalledProcessError as e:
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log('Error calling pam-auth-update: %s' % e, level=ERROR)
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class Tally2PAMContext(object):
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def __call__(self):
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ctxt = {}
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settings = utils.get_settings('os')
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ctxt['auth_lockout_time'] = settings['auth']['lockout_time']
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ctxt['auth_retries'] = settings['auth']['retries']
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return ctxt
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class Tally2PAM(TemplatedFile):
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"""The PAM Audit verifies the linux PAM settings."""
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def __init__(self, path):
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super(Tally2PAM, self).__init__(path=path,
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template_dir=TEMPLATES_DIR,
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context=Tally2PAMContext(),
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user='root',
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group='root',
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mode=0o0640)
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def pre_write(self):
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# Always remove?
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apt_purge('libpam-ccreds')
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apt_update(fatal=True)
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apt_install('libpam-modules')
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def post_write(self):
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"""Updates the PAM configuration after the file has been written"""
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try:
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check_output(['pam-auth-update', '--package'])
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except CalledProcessError as e:
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log('Error calling pam-auth-update: %s' % e, level=ERROR)
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