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ceph-ansible/library/ceph_key.py

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#!/usr/bin/python
# Copyright 2018, Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
__metaclass__ = type
ANSIBLE_METADATA = {
'metadata_version': '1.1',
'status': ['preview'],
'supported_by': 'community'
}
DOCUMENTATION = '''
---
module: ceph_key
author: Sebastien Han <seb@redhat.com>
short_description: Manage Cephx key(s)
version_added: "2.6"
description:
- Manage CephX creation, deletion and updates.
It can also list and get information about keyring(s).
options:
cluster:
description:
- The ceph cluster name.
required: false
default: ceph
name:
description:
- name of the CephX key
required: true
state:
description:
- If 'present' is used, the module creates a keyring
with the associated capabilities.
If 'present' is used and a secret is provided the module
will always add the key. Which means it will update
the keyring if the secret changes, the same goes for
the capabilities.
If 'absent' is used, the module will simply delete the keyring.
If 'list' is used, the module will list all the keys and will
return a json output.
If 'update' is used, the module will **only** update
the capabilities of a given keyring.
If 'info' is used, the module will return in a json format the
description of a given keyring.
required: true
choices: ['present', 'absent', 'list', 'update', 'info']
default: list
caps:
description:
- CephX key capabilities
default: None
required: false
secret:
description:
- keyring's secret value
required: false
default: None
import_key:
description:
- Wether or not to import the created keyring into Ceph.
This can be useful for someone that only wants to generate keyrings
but not add them into Ceph.
required: false
default: True
dest:
description:
- Destination to write the keyring
required: false
default: /etc/ceph/
fetch_initial_keys:
description:
- Fetch client.admin and bootstrap key.
This is only needed for Nautilus and above.
Writes down to the filesystem the initial keys generated by the monitor. # noqa E501
This command can ONLY run from a monitor node.
required: false
default: false
'''
EXAMPLES = '''
keys_to_create:
- { name: client.key, key: "AQAin8tUUK84ExAA/QgBtI7gEMWdmnvKBzlXdQ==", caps: { mon: "allow rwx", mds: "allow *" } , mode: "0600" } # noqa e501
- { name: client.cle, caps: { mon: "allow r", osd: "allow *" } , mode: "0600" } # noqa e501
caps:
mon: "allow rwx"
mds: "allow *"
- name: create ceph admin key
ceph_key:
name: client.admin
state: present
secret: AQAin8tU2DsKFBAAFIAzVTzkL3+gtAjjpQiomw==
caps:
mon: allow *
osd: allow *
mgr: allow *
mds: allow
mode: 0400
import_key: False
- name: create monitor initial keyring
ceph_key:
name: mon.
state: present
secret: AQAin8tUMICVFBAALRHNrV0Z4MXupRw4v9JQ6Q==
caps:
mon: allow *
dest: "/var/lib/ceph/tmp/"
import_key: False
- name: create cephx key
ceph_key:
name: "{{ keys_to_create }}"
state: present
caps: "{{ caps }}"
- name: create cephx key but don't import it in Ceph
ceph_key:
name: "{{ keys_to_create }}"
state: present
caps: "{{ caps }}"
import_key: False
- name: update cephx key
ceph_key:
name: "my_key"
state: update
caps: "{{ caps }}"
- name: delete cephx key
ceph_key:
name: "my_key"
state: absent
- name: info cephx key
ceph_key:
name: "my_key""
state: info
- name: list cephx keys
ceph_key:
state: list
- name: fetch cephx keys
ceph_key:
state: fetch_initial_keys
'''
RETURN = '''# '''
from ansible.module_utils.basic import AnsibleModule # noqa E402
import datetime # noqa E402
import grp # noqa E402
import json # noqa E402
import os # noqa E402
import pwd # noqa E402
import stat # noqa E402
import struct # noqa E402
import time # noqa E402
import base64 # noqa E402
import socket # noqa E402
CEPH_INITIAL_KEYS = ['client.admin', 'client.bootstrap-mds', 'client.bootstrap-mgr', # noqa E501
'client.bootstrap-osd', 'client.bootstrap-rbd', 'client.bootstrap-rbd-mirror', 'client.bootstrap-rgw'] # noqa E501
def fatal(message, module):
'''
Report a fatal error and exit
'''
if module:
module.fail_json(msg=message, rc=1)
else:
raise(Exception(message))
def container_exec(binary, container_image):
'''
Build the docker CLI to run a command inside a container
'''
container_binary = os.getenv('CEPH_CONTAINER_BINARY')
command_exec = [container_binary,
'run',
'--rm',
'--net=host',
'-v', '/etc/ceph:/etc/ceph:z',
'-v', '/var/lib/ceph/:/var/lib/ceph/:z',
'-v', '/var/log/ceph/:/var/log/ceph/:z',
os.path.join('--entrypoint=' + binary),
container_image]
return command_exec
def is_containerized():
'''
Check if we are running on a containerized cluster
'''
if 'CEPH_CONTAINER_IMAGE' in os.environ:
container_image = os.getenv('CEPH_CONTAINER_IMAGE')
else:
container_image = None
return container_image
def generate_secret():
'''
Generate a CephX secret
'''
key = os.urandom(16)
header = struct.pack('<hiih', 1, int(time.time()), 0, len(key))
secret = base64.b64encode(header + key)
return secret
def generate_caps(cmd, _type, caps):
'''
Generate CephX capabilities list
'''
for k, v in caps.items():
# makes sure someone didn't pass an empty var,
# we don't want to add an empty cap
if len(k) == 0:
continue
if _type == "ceph-authtool":
cmd.extend(["--cap"])
cmd.extend([k, v])
return cmd
def generate_ceph_cmd(cluster, args, user, user_key, container_image=None):
'''
Generate 'ceph' command line to execute
'''
if container_image:
binary = 'ceph'
cmd = container_exec(
binary, container_image)
else:
binary = ['ceph']
cmd = binary
base_cmd = [
'-n',
user,
'-k',
user_key,
'--cluster',
cluster,
'auth',
]
cmd.extend(base_cmd + args)
return cmd
def generate_ceph_authtool_cmd(cluster, name, secret, caps, dest, container_image=None): # noqa E501
'''
Generate 'ceph-authtool' command line to execute
'''
if container_image:
binary = 'ceph-authtool'
cmd = container_exec(
binary, container_image)
else:
binary = ['ceph-authtool']
cmd = binary
base_cmd = [
'--create-keyring',
dest,
'--name',
name,
'--add-key',
secret,
]
cmd.extend(base_cmd)
cmd = generate_caps(cmd, "ceph-authtool", caps)
return cmd
def create_key(module, result, cluster, name, secret, caps, import_key, dest, container_image=None): # noqa E501
'''
Create a CephX key
'''
args = [
'import',
'-i',
dest,
]
cmd_list = []
if not secret:
secret = generate_secret()
cmd_list.append(generate_ceph_authtool_cmd(
cluster, name, secret, caps, dest, container_image))
if import_key:
user = "client.admin"
user = "client.admin"
user_key = os.path.join(
"/etc/ceph/" + cluster + ".client.admin.keyring")
cmd_list.append(generate_ceph_cmd(
cluster, args, user, user_key, container_image))
return cmd_list
def update_key(cluster, name, caps, container_image=None):
'''
Update a CephX key's capabilities
'''
cmd_list = []
args = [
'caps',
name,
]
args = generate_caps(args, "ceph", caps)
user = "client.admin"
user_key = os.path.join(
"/etc/ceph/" + cluster + ".client.admin.keyring")
cmd_list.append(generate_ceph_cmd(
cluster, args, user, user_key, container_image))
return cmd_list
def delete_key(cluster, name, container_image=None):
'''
Delete a CephX key
'''
cmd_list = []
args = [
'del',
name,
]
user = "client.admin"
user_key = os.path.join(
"/etc/ceph/" + cluster + ".client.admin.keyring")
cmd_list.append(generate_ceph_cmd(
cluster, args, user, user_key, container_image))
return cmd_list
def get_key(cluster, name, dest, container_image=None):
'''
Get a CephX key (write on the filesystem)
'''
cmd_list = []
args = [
'get',
name,
'-o',
dest,
]
user = "client.admin"
user_key = os.path.join(
"/etc/ceph/" + cluster + ".client.admin.keyring")
cmd_list.append(generate_ceph_cmd(
cluster, args, user, user_key, container_image))
return cmd_list
def info_key(cluster, name, user, user_key, output_format, container_image=None): # noqa E501
'''
Get information about a CephX key
'''
cmd_list = []
args = [
'get',
name,
'-f',
output_format,
]
cmd_list.append(generate_ceph_cmd(
cluster, args, user, user_key, container_image))
return cmd_list
def list_keys(cluster, user, user_key, container_image=None):
'''
List all CephX keys
'''
cmd_list = []
args = [
'ls',
'-f',
'json',
]
cmd_list.append(generate_ceph_cmd(
cluster, args, user, user_key, container_image))
return cmd_list
def exec_commands(module, cmd_list):
'''
Execute command(s)
'''
for cmd in cmd_list:
rc, out, err = module.run_command(cmd)
if rc != 0:
return rc, cmd, out, err
return rc, cmd, out, err
def lookup_ceph_initial_entities(out):
'''
Lookup Ceph initial keys entries in the auth map
'''
# convert out to json, ansible returns a string...
try:
out_dict = json.loads(out)
except ValueError as e:
fatal("Could not decode 'ceph auth list' json output: {}".format(e), module) # noqa E501
entities = []
if "auth_dump" in out_dict:
for key in out_dict["auth_dump"]:
for k, v in key.items():
if k == "entity":
if v in CEPH_INITIAL_KEYS:
entities.append(v)
else:
fatal("'auth_dump' key not present in json output:", module) # noqa E501
if len(entities) != len(CEPH_INITIAL_KEYS):
return None
return entities
def build_key_path(cluster, entity):
'''
Build key path depending on the key type
'''
if "admin" in entity:
path = "/etc/ceph"
key_path = os.path.join(
path + "/" + cluster + "." + entity + ".keyring")
elif "bootstrap" in entity:
path = "/var/lib/ceph"
# bootstrap keys show up as 'client.boostrap-osd'
# however the directory is called '/var/lib/ceph/bootstrap-osd'
# so we need to substring 'client.'
entity_split = entity.split('.')[1]
key_path = os.path.join(
path + "/" + entity_split + "/" + cluster + ".keyring")
else:
return None
return key_path
def run_module():
module_args = dict(
cluster=dict(type='str', required=False, default='ceph'),
name=dict(type='str', required=False),
state=dict(type='str', required=True),
caps=dict(type='dict', required=False, default=None),
secret=dict(type='str', required=False, default=None),
import_key=dict(type='bool', required=False, default=True),
dest=dict(type='str', required=False, default='/etc/ceph/'),
)
module = AnsibleModule(
argument_spec=module_args,
supports_check_mode=True,
add_file_common_args=True,
)
# Gather module parameters in variables
state = module.params['state']
name = module.params.get('name')
cluster = module.params.get('cluster')
caps = module.params.get('caps')
secret = module.params.get('secret')
import_key = module.params.get('import_key')
dest = module.params.get('dest')
result = dict(
changed=False,
stdout='',
stderr='',
rc='',
start='',
end='',
delta='',
)
if module.check_mode:
return result
startd = datetime.datetime.now()
# will return either the image name or None
container_image = is_containerized()
# Test if the key exists, if it does we skip its creation
# We only want to run this check when a key needs to be added
# There is no guarantee that any cluster is running and we don't need one
if import_key:
user = "client.admin"
user_key = os.path.join(
"/etc/ceph/" + cluster + ".client.admin.keyring")
output_format = "json"
rc, cmd, out, err = exec_commands(
module, info_key(cluster, name, user, user_key, output_format, container_image)) # noqa E501
if state == "present":
if not caps:
fatal("Capabilities must be provided when state is 'present'", module) # noqa E501
# Build a different path for bootstrap keys as there are stored as
# /var/lib/ceph/bootstrap-rbd/ceph.keyring
if 'bootstrap' in dest:
file_path = os.path.join(dest + "/" + cluster + ".keyring")
else:
file_path = os.path.join(dest + "/" + cluster +
"." + name + ".keyring")
# We allow 'present' to override any existing key
# ONLY if a secret is provided
# if not we skip the creation
if import_key:
if rc == 0 and not secret:
# If the key exists in Ceph we must fetch it on the system
# because nothing tells us it exists on the fs or not
rc, cmd, out, err = exec_commands(module, get_key(cluster, name, file_path, container_image)) # noqa E501
result["stdout"] = "skipped, since {0} already exists, we only fetched the key at {1}. If you want to update a key use 'state: update'".format( # noqa E501
name, file_path)
result['rc'] = rc
module.exit_json(**result)
rc, cmd, out, err = exec_commands(module, create_key(
module, result, cluster, name, secret, caps, import_key, dest, container_image)) # noqa E501
file_args = module.load_file_common_arguments(module.params)
file_args['path'] = file_path
module.set_fs_attributes_if_different(file_args, False)
elif state == "update":
if not caps:
fatal("Capabilities must be provided when state is 'update'", module) # noqa E501
if rc != 0:
result["stdout"] = "skipped, since {0} does not exist".format(name)
result['rc'] = 0
module.exit_json(**result)
rc, cmd, out, err = exec_commands(
module, update_key(cluster, name, caps, container_image))
# After the update we don't need to overwrite the key on the filesystem
# since the secret has not changed
elif state == "absent":
rc, cmd, out, err = exec_commands(
module, delete_key(cluster, name, container_image))
elif state == "info":
if rc != 0:
result["stdout"] = "skipped, since {0} does not exist".format(name)
result['rc'] = 0
module.exit_json(**result)
user = "client.admin"
user_key = os.path.join(
"/etc/ceph/" + cluster + ".client.admin.keyring")
output_format = "json"
rc, cmd, out, err = exec_commands(
module, info_key(cluster, name, user, user_key, output_format, container_image)) # noqa E501
elif state == "list":
user = "client.admin"
user_key = os.path.join(
"/etc/ceph/" + cluster + ".client.admin.keyring")
rc, cmd, out, err = exec_commands(
module, list_keys(cluster, user, user_key, container_image))
elif state == "fetch_initial_keys":
hostname = socket.gethostname()
user = "mon."
user_key = os.path.join(
"/var/lib/ceph/mon/" + cluster + "-" + hostname + "/keyring")
rc, cmd, out, err = exec_commands(
module, list_keys(cluster, user, user_key, container_image))
if rc != 0:
result["stdout"] = "failed to retrieve ceph keys".format(name)
result['rc'] = 0
module.exit_json(**result)
entities = lookup_ceph_initial_entities(out)
if entities is None:
fatal("Failed to find some of the initial entities", module)
# get ceph's group and user id
if container_image:
ceph_uid = os.getenv('CEPH_UID')
ceph_grp = os.getenv('CEPH_UID')
else:
ceph_uid = pwd.getpwnam('ceph').pw_uid
ceph_grp = grp.getgrnam('ceph').gr_gid
output_format = "plain"
for entity in entities:
key_path = build_key_path(cluster, entity)
if key_path is None:
fatal("Failed to build key path, no entity yet?", module)
elif os.path.isfile(key_path):
# if the key is already on the filesystem
# there is no need to fetch it again
continue
extra_args = [
'-o',
key_path,
]
info_cmd = info_key(cluster, entity, user,
user_key, output_format, container_image)
# we use info_cmd[0] because info_cmd is an array made of an array
info_cmd[0].extend(extra_args)
rc, cmd, out, err = exec_commands(
module, info_cmd) # noqa E501
# apply ceph:ceph ownership and mode 0400 on keys
# FIXME by using
# file_args = module.load_file_common_arguments(module.params)
# file_args['path'] = dest
# module.set_fs_attributes_if_different(file_args, False)
try:
os.chown(key_path, ceph_uid, ceph_grp)
os.chmod(key_path, stat.S_IRUSR)
except OSError as e:
fatal("Failed to set owner/group/permissions of %s: %s" % (
key_path, str(e)), module)
else:
module.fail_json(
msg='State must either be "present" or "absent" or "update" or "list" or "info" or "fetch_initial_keys".', changed=False, rc=1) # noqa E501
endd = datetime.datetime.now()
delta = endd - startd
result = dict(
cmd=cmd,
start=str(startd),
end=str(endd),
delta=str(delta),
rc=rc,
stdout=out.rstrip("\r\n"),
stderr=err.rstrip("\r\n"),
changed=True,
)
if rc != 0:
module.fail_json(msg='non-zero return code', **result)
module.exit_json(**result)
def main():
run_module()
if __name__ == '__main__':
main()
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