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-rw-r--r--cloudinit/CloudConfig/cc_ca_certs.py88
1 files changed, 88 insertions, 0 deletions
diff --git a/cloudinit/CloudConfig/cc_ca_certs.py b/cloudinit/CloudConfig/cc_ca_certs.py
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+++ b/cloudinit/CloudConfig/cc_ca_certs.py
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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()