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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 subprocess import check_call
from cloudinit.util import (write_file, get_cfg_option_list_or_str,
delete_dir_contents)
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/"
def update_ca_certs():
"""
Updates the CA certificate cache on the current machine.
"""
check_call(["update-ca-certificates"])
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:
cert_file_contents = "\n".join(certs)
cert_file_fullpath = os.path.join(CA_CERT_PATH, CA_CERT_FILENAME)
write_file(cert_file_fullpath, cert_file_contents, mode=0644)
# Append cert filename to CA_CERT_CONFIG file.
write_file(CA_CERT_CONFIG, "\n%s" % CA_CERT_FILENAME, omode="a")
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}.
"""
delete_dir_contents(CA_CERT_PATH)
delete_dir_contents(CA_CERT_SYSTEM_PATH)
write_file(CA_CERT_CONFIG, "", mode=0644)
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:
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 = get_cfg_option_list_or_str(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.
update_ca_certs()
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