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# vi: ts=4 expandtab
#
# Author: Mike Milner <mike.milner@canonical.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from cloudinit import util
CA_CERT_PATH = "/usr/share/ca-certificates/"
CA_CERT_FILENAME = "cloud-init-ca-certs.crt"
CA_CERT_CONFIG = "/etc/ca-certificates.conf"
CA_CERT_SYSTEM_PATH = "/etc/ssl/certs/"
CA_CERT_FULL_PATH = os.path.join(CA_CERT_PATH, CA_CERT_FILENAME)
distros = ['ubuntu', 'debian']
def update_ca_certs():
"""
Updates the CA certificate cache on the current machine.
"""
util.subp(["update-ca-certificates"], capture=False)
def add_ca_certs(certs):
"""
Adds certificates to the system. To actually apply the new certificates
you must also call L{update_ca_certs}.
@param certs: A list of certificate strings.
"""
if certs:
# First ensure they are strings...
cert_file_contents = "\n".join([str(c) for c in certs])
util.write_file(CA_CERT_FULL_PATH, cert_file_contents, mode=0o644)
# Append cert filename to CA_CERT_CONFIG file.
# We have to strip the content because blank lines in the file
# causes subsequent entries to be ignored. (LP: #1077020)
orig = util.load_file(CA_CERT_CONFIG)
cur_cont = '\n'.join([l for l in orig.splitlines()
if l != CA_CERT_FILENAME])
out = "%s\n%s\n" % (cur_cont.rstrip(), CA_CERT_FILENAME)
util.write_file(CA_CERT_CONFIG, out, omode="wb")
def remove_default_ca_certs():
"""
Removes all default trusted CA certificates from the system. To actually
apply the change you must also call L{update_ca_certs}.
"""
util.delete_dir_contents(CA_CERT_PATH)
util.delete_dir_contents(CA_CERT_SYSTEM_PATH)
util.write_file(CA_CERT_CONFIG, "", mode=0o644)
debconf_sel = "ca-certificates ca-certificates/trust_new_crts select no"
util.subp(('debconf-set-selections', '-'), debconf_sel)
def handle(name, cfg, _cloud, log, _args):
"""
Call to handle ca-cert sections in cloud-config file.
@param name: The module name "ca-cert" from cloud.cfg
@param cfg: A nested dict containing the entire cloud config contents.
@param cloud: The L{CloudInit} object in use.
@param log: Pre-initialized Python logger object to use for logging.
@param args: Any module arguments from cloud.cfg
"""
# If there isn't a ca-certs section in the configuration don't do anything
if "ca-certs" not in cfg:
log.debug(("Skipping module named %s,"
" no 'ca-certs' key in configuration"), name)
return
ca_cert_cfg = cfg['ca-certs']
# If there is a remove-defaults option set to true, remove the system
# default trusted CA certs first.
if ca_cert_cfg.get("remove-defaults", False):
log.debug("Removing default certificates")
remove_default_ca_certs()
# If we are given any new trusted CA certs to add, add them.
if "trusted" in ca_cert_cfg:
trusted_certs = util.get_cfg_option_list(ca_cert_cfg, "trusted")
if trusted_certs:
log.debug("Adding %d certificates" % len(trusted_certs))
add_ca_certs(trusted_certs)
# Update the system with the new cert configuration.
log.debug("Updating certificates")
update_ca_certs()
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