Current File : //lib/python3/dist-packages/cloudinit/config/cc_ca_certs.py
# Author: Mike Milner <mike.milner@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""CA Certs: Add ca certificates."""
import logging
import os
from textwrap import dedent
from cloudinit import subp, util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema, get_meta_doc
from cloudinit.settings import PER_INSTANCE
LOG = logging.getLogger(__name__)
DEFAULT_CONFIG = {
"ca_cert_path": None,
"ca_cert_local_path": "/usr/local/share/ca-certificates/",
"ca_cert_filename": "cloud-init-ca-cert-{cert_index}.crt",
"ca_cert_config": "/etc/ca-certificates.conf",
"ca_cert_update_cmd": ["update-ca-certificates"],
}
DISTRO_OVERRIDES = {
"fedora": {
"ca_cert_path": "/etc/pki/ca-trust/",
"ca_cert_local_path": "/usr/share/pki/ca-trust-source/",
"ca_cert_filename": "anchors/cloud-init-ca-cert-{cert_index}.crt",
"ca_cert_config": None,
"ca_cert_update_cmd": ["update-ca-trust"],
},
"rhel": {
"ca_cert_path": "/etc/pki/ca-trust/",
"ca_cert_local_path": "/usr/share/pki/ca-trust-source/",
"ca_cert_filename": "anchors/cloud-init-ca-cert-{cert_index}.crt",
"ca_cert_config": None,
"ca_cert_update_cmd": ["update-ca-trust"],
},
"opensuse": {
"ca_cert_path": "/etc/pki/trust/",
"ca_cert_local_path": "/usr/share/pki/trust/",
"ca_cert_filename": "anchors/cloud-init-ca-cert-{cert_index}.crt",
"ca_cert_config": None,
"ca_cert_update_cmd": ["update-ca-certificates"],
},
"photon": {
"ca_cert_path": "/etc/ssl/certs/",
"ca_cert_local_path": "/etc/pki/tls/certs/",
"ca_cert_filename": "cloud-init-ca-cert-{cert_index}.crt",
"ca_cert_config": None,
"ca_cert_update_cmd": ["rehash_ca_certificates.sh"],
},
}
for distro in (
"opensuse-microos",
"opensuse-tumbleweed",
"opensuse-leap",
"sle_hpc",
"sle-micro",
"sles",
):
DISTRO_OVERRIDES[distro] = DISTRO_OVERRIDES["opensuse"]
MODULE_DESCRIPTION = """\
This module adds CA certificates to the system's CA store and updates any
related files using the appropriate OS-specific utility. The default CA
certificates can be disabled/deleted from use by the system with the
configuration option ``remove_defaults``.
.. note::
certificates must be specified using valid yaml. in order to specify a
multiline certificate, the yaml multiline list syntax must be used
.. note::
Alpine Linux requires the ca-certificates package to be installed in
order to provide the ``update-ca-certificates`` command.
"""
distros = [
"alpine",
"debian",
"fedora",
"rhel",
"opensuse",
"opensuse-microos",
"opensuse-tumbleweed",
"opensuse-leap",
"sle_hpc",
"sle-micro",
"sles",
"ubuntu",
"photon",
]
meta: MetaSchema = {
"id": "cc_ca_certs",
"name": "CA Certificates",
"title": "Add ca certificates",
"description": MODULE_DESCRIPTION,
"distros": distros,
"frequency": PER_INSTANCE,
"examples": [
dedent(
"""\
ca_certs:
remove_defaults: true
trusted:
- single_line_cert
- |
-----BEGIN CERTIFICATE-----
YOUR-ORGS-TRUSTED-CA-CERT-HERE
-----END CERTIFICATE-----
"""
)
],
"activate_by_schema_keys": ["ca_certs", "ca-certs"],
}
__doc__ = get_meta_doc(meta)
def _distro_ca_certs_configs(distro_name):
"""Return a distro-specific ca_certs config dictionary
@param distro_name: String providing the distro class name.
@returns: Dict of distro configurations for ca_cert.
"""
cfg = DISTRO_OVERRIDES.get(distro_name, DEFAULT_CONFIG)
cfg["ca_cert_full_path"] = os.path.join(
cfg["ca_cert_local_path"], cfg["ca_cert_filename"]
)
return cfg
def update_ca_certs(distro_cfg):
"""
Updates the CA certificate cache on the current machine.
@param distro_cfg: A hash providing _distro_ca_certs_configs function.
"""
subp.subp(distro_cfg["ca_cert_update_cmd"], capture=False)
def add_ca_certs(distro_cfg, certs):
"""
Adds certificates to the system. To actually apply the new certificates
you must also call the appropriate distro-specific utility such as
L{update_ca_certs}.
@param distro_cfg: A hash providing _distro_ca_certs_configs function.
@param certs: A list of certificate strings.
"""
if not certs:
return
# Write each certificate to a separate file.
for cert_index, c in enumerate(certs, 1):
# First ensure they are strings...
cert_file_contents = str(c)
cert_file_name = distro_cfg["ca_cert_full_path"].format(
cert_index=cert_index
)
util.write_file(cert_file_name, cert_file_contents, mode=0o644)
def disable_default_ca_certs(distro_name, distro_cfg):
"""
Disables all default trusted CA certificates. For Alpine, Debian and
Ubuntu to actually apply the changes you must also call
L{update_ca_certs}.
@param distro_name: String providing the distro class name.
@param distro_cfg: A hash providing _distro_ca_certs_configs function.
"""
if distro_name in ["rhel", "photon"]:
remove_default_ca_certs(distro_cfg)
elif distro_name in ["alpine", "debian", "ubuntu"]:
disable_system_ca_certs(distro_cfg)
if distro_name in ["debian", "ubuntu"]:
debconf_sel = (
"ca-certificates ca-certificates/trust_new_crts " + "select no"
)
subp.subp(("debconf-set-selections", "-"), data=debconf_sel)
def disable_system_ca_certs(distro_cfg):
"""
For every entry in the CA_CERT_CONFIG file prefix the entry with a "!"
in order to disable it.
@param distro_cfg: A hash providing _distro_ca_certs_configs function.
"""
ca_cert_cfg_fn = distro_cfg["ca_cert_config"]
if not ca_cert_cfg_fn or not os.path.exists(ca_cert_cfg_fn):
return
header_comment = (
"# Modified by cloud-init to deselect certs due to user-data"
)
added_header = False
if os.stat(ca_cert_cfg_fn).st_size:
orig = util.load_text_file(ca_cert_cfg_fn)
out_lines = []
for line in orig.splitlines():
if line == header_comment:
added_header = True
out_lines.append(line)
elif line == "" or line[0] in ("#", "!"):
out_lines.append(line)
else:
if not added_header:
out_lines.append(header_comment)
added_header = True
out_lines.append("!" + line)
util.write_file(
ca_cert_cfg_fn, "\n".join(out_lines) + "\n", omode="wb"
)
def remove_default_ca_certs(distro_cfg):
"""
Removes all default trusted CA certificates from the system.
@param distro_cfg: A hash providing _distro_ca_certs_configs function.
"""
if distro_cfg["ca_cert_path"] is None:
return
LOG.debug("Deleting system CA certificates")
util.delete_dir_contents(distro_cfg["ca_cert_path"])
util.delete_dir_contents(distro_cfg["ca_cert_local_path"])
def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
"""
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 "ca-certs" in cfg:
util.deprecate(
deprecated="Key 'ca-certs'",
deprecated_version="22.1",
extra_message="Use 'ca_certs' instead.",
)
elif "ca_certs" not in cfg:
LOG.debug(
"Skipping module named %s, no 'ca_certs' key in configuration",
name,
)
return
if "ca-certs" in cfg and "ca_certs" in cfg:
LOG.warning(
"Found both ca-certs (deprecated) and ca_certs config keys."
" Ignoring ca-certs."
)
ca_cert_cfg = cfg.get("ca_certs", cfg.get("ca-certs"))
distro_cfg = _distro_ca_certs_configs(cloud.distro.name)
# If there is a remove_defaults option set to true, disable the system
# default trusted CA certs first.
if "remove-defaults" in ca_cert_cfg:
util.deprecate(
deprecated="Key 'remove-defaults'",
deprecated_version="22.1",
extra_message="Use 'remove_defaults' instead.",
)
if ca_cert_cfg.get(
"remove_defaults", ca_cert_cfg.get("remove-defaults", False)
):
LOG.debug("Disabling/removing default certificates")
disable_default_ca_certs(cloud.distro.name, distro_cfg)
# 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(distro_cfg, trusted_certs)
# Update the system with the new cert configuration.
LOG.debug("Updating certificates")
update_ca_certs(distro_cfg)
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