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# Copyright (C) 2018 Warsaw Data Center
#
# Author: Malwina Leis <m.leis@rootbox.com>
# Author: Grzegorz Brzeski <gregory@rootbox.io>
# Author: Adam Dobrawy <a.dobrawy@hyperone.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""
This file contains code used to gather the user data passed to an
instance on rootbox / hyperone cloud platforms
"""
import errno
import logging
import os
import os.path
import typing
from ipaddress import IPv4Address
from cloudinit import sources, subp, util
from cloudinit.event import EventScope, EventType
LOG = logging.getLogger(__name__)
ETC_HOSTS = "/etc/hosts"
def get_manage_etc_hosts():
hosts = util.load_text_file(ETC_HOSTS, quiet=True)
if hosts:
LOG.debug("/etc/hosts exists - setting manage_etc_hosts to False")
return False
LOG.debug("/etc/hosts does not exists - setting manage_etc_hosts to True")
return True
def increment_ip(addr, inc: int) -> str:
return str(IPv4Address(int(IPv4Address(addr)) + inc))
def get_three_ips(addr) -> typing.List[str]:
"""Return a list of 3 IP addresses: [addr, addr + 2, addr + 3]
@param addr: an object that is passed to IPvAddress
@return: list of strings
"""
return [
addr,
increment_ip(addr, 2),
increment_ip(addr, 3),
]
def _sub_arp(cmd):
"""
Uses the preferred cloud-init subprocess def of subp.subp
and runs arping. Breaking this to a separate function
for later use in mocking and unittests
"""
return subp.subp(["arping"] + cmd)
def gratuitous_arp(items, distro):
source_param = "-S"
if distro.name in ["fedora", "centos", "rhel"]:
source_param = "-s"
for item in items:
try:
_sub_arp(
["-c", "2", source_param, item["source"], item["destination"]]
)
except subp.ProcessExecutionError as error:
# warning, because the system is able to function properly
# despite no success - some ARP table may be waiting for
# expiration, but the system may continue
LOG.warning(
'Failed to arping from "%s" to "%s": %s',
item["source"],
item["destination"],
error,
)
def get_md():
"""Returns False (not found or error) or a dictionary with metadata."""
devices = set(
util.find_devs_with("LABEL=CLOUDMD")
+ util.find_devs_with("LABEL=cloudmd")
)
if not devices:
return False
for device in devices:
try:
rbx_data = util.mount_cb(
device=device,
callback=read_user_data_callback,
mtype=["vfat", "fat", "msdosfs"],
)
if rbx_data:
return rbx_data
except OSError as err:
if err.errno != errno.ENOENT:
raise
except util.MountFailedError:
util.logexc(
LOG, "Failed to mount %s when looking for user data", device
)
LOG.debug(
"Did not find RbxCloud data, searched devices: %s", ",".join(devices)
)
return False
def generate_network_config(netadps):
"""Generate network configuration
@param netadps: A list of network adapter settings
@returns: A dict containing network config
"""
return {
"version": 1,
"config": [
{
"type": "physical",
"name": "eth{}".format(str(i)),
"mac_address": netadp["macaddress"].lower(),
"subnets": [
{
"type": "static",
"address": ip["address"],
"netmask": netadp["network"]["netmask"],
"control": "auto",
"gateway": netadp["network"]["gateway"],
"dns_nameservers": netadp["network"]["dns"][
"nameservers"
],
}
for ip in netadp["ip"]
],
}
for i, netadp in enumerate(netadps)
],
}
def read_user_data_callback(mount_dir):
"""This callback will be applied by util.mount_cb() on the mounted
drive.
@param mount_dir: String representing path of directory where mounted drive
is available
@returns: A dict containing userdata, metadata and cfg based on metadata.
"""
meta_data = util.load_json(
text=util.load_binary_file(fname=os.path.join(mount_dir, "cloud.json"))
)
user_data = util.load_text_file(
fname=os.path.join(mount_dir, "user.data"), quiet=True
)
if "vm" not in meta_data or "netadp" not in meta_data:
util.logexc(LOG, "Failed to load metadata. Invalid format.")
return None
username = meta_data.get("additionalMetadata", {}).get("username")
ssh_keys = meta_data.get("additionalMetadata", {}).get("sshKeys", [])
hash = None
if meta_data.get("additionalMetadata", {}).get("password"):
hash = meta_data["additionalMetadata"]["password"]["sha512"]
network = generate_network_config(meta_data["netadp"])
data = {
"userdata": user_data,
"metadata": {
"instance-id": meta_data["vm"]["_id"],
"local-hostname": meta_data["vm"]["name"],
"public-keys": [],
},
"gratuitous_arp": [
{"source": ip["address"], "destination": target}
for netadp in meta_data["netadp"]
for ip in netadp["ip"]
for target in get_three_ips(netadp["network"]["gateway"])
],
"cfg": {
"ssh_pwauth": True,
"disable_root": True,
"system_info": {
"default_user": {
"name": username,
"gecos": username,
"sudo": ["ALL=(ALL) NOPASSWD:ALL"],
"passwd": hash,
"lock_passwd": False,
"ssh_authorized_keys": ssh_keys,
}
},
"network_config": network,
"manage_etc_hosts": get_manage_etc_hosts(),
},
}
LOG.debug("returning DATA object:")
LOG.debug(data)
return data
class DataSourceRbxCloud(sources.DataSource):
dsname = "RbxCloud"
default_update_events = {
EventScope.NETWORK: {
EventType.BOOT_NEW_INSTANCE,
EventType.BOOT,
EventType.BOOT_LEGACY,
}
}
def __init__(self, sys_cfg, distro, paths):
sources.DataSource.__init__(self, sys_cfg, distro, paths)
self.seed = None
self.gratuitous_arp = None
self.cfg = None
def __str__(self):
root = sources.DataSource.__str__(self)
return "%s [seed=%s]" % (root, self.seed)
def _get_data(self):
"""
Metadata is passed to the launching instance which
is used to perform instance configuration.
"""
rbx_data = get_md()
if rbx_data is False:
return False
self.userdata_raw = rbx_data["userdata"]
self.metadata = rbx_data["metadata"]
self.gratuitous_arp = rbx_data["gratuitous_arp"]
self.cfg = rbx_data["cfg"]
return True
@property
def network_config(self):
return self.cfg["network_config"]
def get_public_ssh_keys(self):
return self.metadata["public-keys"]
def get_userdata_raw(self):
return self.userdata_raw
def get_config_obj(self):
return self.cfg
def activate(self, cfg, is_new_instance):
gratuitous_arp(self.gratuitous_arp, self.distro)
# Used to match classes to dependencies
datasources = [
(DataSourceRbxCloud, (sources.DEP_FILESYSTEM,)),
]
# Return a list of data sources that match this set of dependencies
def get_datasource_list(depends):
return sources.list_from_depends(depends, datasources)