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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
import pwd
import socket
from subprocess import check_call
import json
import StringIO
import ConfigParser
import cloudinit.CloudConfig as cc
import cloudinit.util as 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/"
def write_file(filename, contents, owner, group, mode):
"""
Write a file to disk with specified owner, group, and mode. If the file
exists already it will be overwritten.
@param filename: Full path to the new file.
@param contents: The contents of the newly created file.
@param owner: The username who should own the file.
@param group: The group for the new file.
@param mode: The octal mode (as string) for the new file.
"""
raise NotImplementedError()
def append_to_file(filename, contents):
"""
Append C{contents} to an existing file on the filesystem. If the file
doesn't exist it will be created with the default owner and permissions.
@param filename: Full path to the new file.
@param contents: The contents to append to the file.
"""
raise NotImplementedError()
def delete_dir_contents(dirname):
"""
Delete all the contents of the directory specified by C{dirname} without
deleting the directory itself.
@param dirname: The directory whose contents should be deleted.
"""
raise NotImplementedError()
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, "root", "root", "644")
append_to_file(CA_CERT_CONFIG, CA_CERT_FILENAME)
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, "", "root", "root", "644")
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 not cfg.has_key('ca-certs'):
return
ca_cert_cfg = cfg['ca-certs']
if ca_cert_cfg.get("remove-defaults", False):
remove_default_ca_certs()
# set the validation key based on the presence of either 'validation_key'
# or 'validation_cert'. In the case where both exist, 'validation_key'
# takes precedence
if ca_cert_cfg.has_key('trusted'):
trusted_certs = util.get_cfg_option_list_or_str(ca_cert_cfg, 'trusted')
if trusted_certs:
add_ca_certs(trusted_certs)
update_ca_certs()
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