def load(config):
tunnels = [Tunnel(t) for t in util.flatten(config.get('tunnel', []))]
_assert_no_duplicate_remote_endpoint(tunnels)
internal_interfaces = [InternalInterface(i, tunnels)
for i in util.flatten(config.get('internal_interface', []))]
additional_config = _gather_firewall_config(tunnels, internal_interfaces)
def run(outdir, diff, no_write, no_exec, no_git):
if util.write_file(outdir, 'ipsec-tools.conf',
_render_ipsec_tools(tunnels), no_write, diff):
if os.geteuid() == 0:
util.cmd(('/etc/ipsec-tools.conf',), no_exec)
if any([
util.write_file(outdir, 'racoon/psk.txt', _render_racoon_psk(tunnels), no_write, diff),
util.write_file(outdir, 'racoon/racoon.conf', _render_racoon(tunnels), no_write, diff),
]):
if os.geteuid() == 0:
util.cmd(('racoonctl', 'reload-config'), no_exec)
if util.write_file(outdir, 'network/interfaces.d/caretakr.ipsec.conf',
_render_interfaces(internal_interfaces), no_write, diff=True):
logger.warn("Automatic activation of interface changes not implemented!")
util.git_commit(outdir, ['ipsec-tools.conf',
'racoon/psk.txt', 'racoon/racoon.conf',
'network/interfaces.d/caretakr.ipsec.conf'], no_git, 'ipsec')
return run, additional_config
def __init__(self, config, tunnels):
self.name = config.pop('name')
self.ovs = config.pop('ovs_gre', False)
self.ip = [ipaddr.IPNetwork(i)
for i in util.flatten(config.pop('ip', []))]
if self.ovs is True:
self.ovs_gre_peers = [util.HostIPPort(peer)
for peer in util.flatten(config.pop('ovs_gre_peers', []))]
self.ovs_bridge_eth = util.flatten(config.pop('ovs_bridge_eth', []))
def __init__(self, config):
self.remote_endpoint = ipaddr.IPAddress(config.pop('remote_endpoint'))
self.local_endpoint = ipaddr.IPAddress(config.pop('local_endpoint'))
self.local_interface = config.pop('local_interface', 'eth0')
self.racoon = Racoon(self, config.get('racoon'))
self.policy_level = config.pop('policy_level', 'unique')
self.remote_subnets = [ipaddr.IPNetwork(s, strict=True)
for s in util.flatten(config.pop('remote_subnets'))]
self.local_subnets = [ipaddr.IPNetwork(s, strict=True)
for s in util.flatten(config.pop('local_subnets'))]
self.allow_incoming_traffic = config.pop('allow_incoming_traffic', False)
self.snat = config.pop('snat', None)
def _load_virtual_server_group(config):
virtual_server_group = []
virtual_server = []
for group_name in sorted(config.keys()):
group_config = config[group_name]
vs = {}
vs['hostips'] = [util.HostIPPort(x) for x in group_config.pop('virtual_server')]
vs['ipv4'] = sorted(util.flatten([hostip.ipv4 for hostip in vs['hostips']]))
vs['ipv6'] = sorted(util.flatten([hostip.ipv6 for hostip in vs['hostips']]))
rs = {}
rs['hostips'] = [util.HostIPPort(x) for x in group_config.pop('real_server')]
rs['ipv4'] = sorted(util.flatten([hostip.ipv4 for hostip in rs['hostips']]))
rs['ipv6'] = sorted(util.flatten([hostip.ipv6 for hostip in rs['hostips']]))
drain = {}
if 'drain' in group_config:
drain['hostip'] = util.HostIPPort(group_config.pop('drain', []))
drain['ipv4'] = drain['hostip'].ipv4
drain['ipv6'] = drain['hostip'].ipv6
for l3proto in ('ipv4', 'ipv6'):
invalid_drains = set(drain[l3proto]) - set(rs[l3proto])
if len(invalid_drains) > 0:
raise Exception("Drain IP not a real_server: %s" %
','.join(map(str, invalid_drains)))
else:
drain['hostip'] = []
drain['ipv4'] = []
drain['ipv6'] = []
for l7proto in util.flatten(group_config.pop('proto')):
port = port_by_l7proto[l7proto]
for l3proto in ('ipv4', 'ipv6'):
for l4proto in l4proto_by_l7proto[l7proto]:
name = '%s_%s_%s_%s' % (group_name, l3proto, l4proto, l7proto)
if len(vs[l3proto]) == 0:
logger.debug("Ignoring %s, no virtual ips!" % name)
continue
if len(rs[l3proto]) == 0:
logger.debug("Ignoring %s, no real ips!" % name)
continue
virtual_server_group.append(VirtualServerGroup(name, vs[l3proto],
l3proto, l4proto, l7proto, port))
virtual_server.append(VirtualServer(name, l3proto, l4proto, l7proto,
port, rs[l3proto], drain[l3proto]))
return virtual_server_group, virtual_server
def check_wildcard(a):
if a is None:
return None
if '*' in util.flatten(a):
logger.debug("Emptying address list because it has a wildcard: %s" % a)
return []
return a
def add(self, things):
for thing in util.flatten(things):
if isinstance(thing, firewall.IPTablesRuleset):
self.fw.add(thing)
elif isinstance(thing, firewall.HostsAllowRuleset):
self.ha.add(thing)
else:
raise Exception("Must be IPTablesRuleset or HostsAllowRuleset: %s" % str(thing))
def __init__(self, name, app_dict, appnode_catchall, ipfilters):
if not nginx_util.looks_like_app_name(name):
raise ValueError("Invalid application name: %s", name)
self.name = name
self.server_name = [util.HostIPPort(server_name)
for server_name in util.flatten(app_dict.pop('fqdn'))]
self.catchall = appnode_catchall[app_dict.pop('catchall')]
runtime_port = app_dict.pop('runtime_port', None)
if runtime_port is not None:
if not nginx_util.looks_like_port(runtime_port):
raise ValueError("Invalid runtime port: %s", runtime_port)
self.runtime_port = int(runtime_port)
else:
self.runtime_port = None
self.staticfilexas = app_dict.pop('staticfilexas', True)
self.mxclientsystem = app_dict.pop('mxclientsystem', None)
self.x_frame_options = app_dict.pop('x_frame_options', None)
self.authenticate = app_dict.pop('authenticate', 'none')
self.mobile = app_dict.pop('mobile', None)
if 'ipfilter' in app_dict:
self.ipfilter = ipfilters[app_dict.pop('ipfilter')]
else:
self.ipfilter = None
if 'root' in app_dict:
self.root = app_dict.pop('root')
if not nginx_util.looks_like_path(self.root):
raise ValueError("Invalid root path: %s" % self.root)
else:
self.root = None
if 'index' in app_dict:
self.index = app_dict.pop('index')
if not nginx_util.looks_like_index_html(self.index):
raise ValueError("Invalid index name: %s" % self.index)
else:
self.index = None
self.backup_servers = app_dict.pop('backup_server', [])
self.client_max_body_size = app_dict.pop('client_max_body_size', '1G')
if not nginx_util.looks_like_offset_number(self.client_max_body_size):
raise ValueError("Invalid size for client_max_body_size: %s" %
self.client_max_body_size)
self.unavailable = app_dict.pop('unavailable', False)
if not isinstance(self.unavailable, bool):
raise ValueError("unavailable option needs True or False as value, "
"%s given" % self.unavailable)
self.request_handler = []
for suburl, rh_dict in app_dict.pop('request_handler', {}).items():
self.request_handler.append(AppnodeAppRequestHandler(suburl, rh_dict, ipfilters))
def virtual_ip_address(self, ips):
ips = util.flatten(ips)
ips = (sorted(set([ip for ip in ips if isinstance(ip, ipaddr.IPv4Address)])) +
sorted(set([ip for ip in ips if isinstance(ip, ipaddr.IPv6Address)])))
if len(ips) > 0:
self._virtual_ipaddress = ips[0]
else:
logger.error("No VRRP virtual_ipaddress available at all!")
self._virtual_ipaddress = None
self._virtual_ipaddress_excluded = ips[1:]
def _expand_interfaces(interfaces, depth=0, maxdepth=10):
done = True
logger.trace("interfaces before: (depth %s)\n%s" % (depth, yaml.dump(interfaces)))
interfaces = {k: util.flatten(v) for (k, v) in interfaces.iteritems()}
for name in list(sorted(interfaces.keys())):
interfaces[name] = util.flatten(interfaces[name])
logger.trace("looking at %s: %s" % (name, interfaces[name]))
for i in range(len(interfaces[name])):
iface = interfaces[name][i]
if isinstance(iface, str) and iface in interfaces and iface != name:
interfaces[name][i] = interfaces[iface]
logger.trace("replacing %s with %s" % (iface, interfaces[iface]))
done = False
logger.trace("interfaces after: (depth %s)\n%s" % (depth, yaml.dump(interfaces)))
if not done:
if depth < maxdepth:
interfaces = _expand_interfaces(interfaces, depth+1, maxdepth)
else:
raise Exception("Maximum recursion depth exceeded for _expand_interfaces")
return interfaces
def _custom_rules(custom, interfaces):
_expand_interface = lambda iface: interfaces.get(iface, iface)
stages = defaultdict(dict)
for table, chains in custom.iteritems():
for chain, rules in chains.iteritems():
for rule in rules:
stage = rule.pop('stage', 'middle')
comment = rule.pop('comment', None)
command = rule.pop('command', 'A')
i = map(_expand_interface, util.flatten(rule.pop('i', [])))
o = map(_expand_interface, util.flatten(rule.pop('o', [])))
s = check_wildcard(rule.pop('s', []))
d = check_wildcard(rule.pop('d', []))
r = rule.pop('r', '-j ACCEPT')
if len(rule) > 0:
logger.warn("Unrecognized options in custom rule: %s" % rule)
ruleset = stages[stage].setdefault((table, chain),
firewall.IPTablesRuleset(table, chain))
ruleset.add(comment=comment, command=command, i=i, o=o, s=s, d=d, r=r)
return stages
def _gather_firewall_config(tunnels, internal_interfaces):
ovs_gre_peers = util.flatten([internal_interface.ovs_gre_peer_ips()
for internal_interface in internal_interfaces])
if len(ovs_gre_peers) == 0:
ovs_gre_peers = None
customer_ipsec_gateway = [tunnel.generate_firewall_rules()
for tunnel in tunnels]
return {
'firewall': {
'gre_peers': ovs_gre_peers,
'customer_ipsec_gateway': customer_ipsec_gateway,
}
}
def _figure_out_modules(modules_to_load, modules_to_run):
if modules_to_load is None or len(modules_to_load) == 0:
modules_to_load = known_modules
else:
modules_to_load = util.flatten(modules_to_load)
filtered_to_load = []
for module_name in modules_to_load:
if module_name not in known_modules:
raise Exception("Unknown module %s!" % module_name)
else:
filtered_to_load.append(module_name)
if modules_to_run is None or len(modules_to_run) == 0:
modules_to_run = filtered_to_load
else:
modules_to_run = util.flatten(modules_to_run)
filtered_to_run = []
for module_name in modules_to_run:
if module_name not in known_modules:
logger.error("Ignoring unknown module %s!" % module_name)
elif module_name not in modules_to_load:
logger.error("Skipping module run for %s, it's not being loaded!" % module_name)
else:
filtered_to_run.append(module_name)
return filtered_to_load, filtered_to_run
def __init__(self, name, catchall_dict):
self.name = name
self.ssl = catchall_dict.pop('ssl', name)
self.x_frame_options = catchall_dict.pop('x_frame_options', None)
self.ssl_client_certificate = catchall_dict.pop('ssl_client_certificate', None)
self.ssl_crl = catchall_dict.pop('ssl_crl', None)
self.ssl_verify_client = catchall_dict.pop('ssl_verify_client', 'on')
self.listen = []
for listen_item in util.flatten(catchall_dict.pop('listen', [])):
listen_hostipport = util.HostIPPort(listen_item)
if len(listen_hostipport.addresses) == 0:
raise Exception("No listen addresses found for: %s (%s)!" %
(listen_item, self._name))
self.listen.append(listen_hostipport)
def __init__(self, name, redir_dict, ff_ssl_catchall):
self.name = name
self.server_name = util.HostIPPort(redir_dict.pop('fqdn'))
self.redirect = redir_dict.pop('redirect')
self.catchall = find_catchall_for_app(self.server_name.fqdn,
redir_dict.pop('catchall', None),
ff_ssl_catchall)
if 'hsts_max_age' in redir_dict:
self.hsts_max_age = int(redir_dict.pop('hsts_max_age'))
else:
self.hsts_max_age = None
self.ssl = redir_dict.pop('ssl', self.catchall.ssl)
server_name_ips = self.server_name.addresses
catchall_ips = util.flatten([listen.addresses
for listen in self.catchall.listen])
if len(set(server_name_ips) - set(catchall_ips)) > 0:
logger.warn("%s %s (%s) resolves to [%s] but catchall (%s) listens on [%s]" %
(type(self).__name__, self._name, self.server_name.fqdn,
', '.join([str(x) for x in server_name_ips]),
self.catchall.name,
', '.join([str(x) for x in catchall_ips])))
def __init__(self, name, app_dict, ff_ssl_catchall):
self.name = name
self.appnode = util.HostIPPort(app_dict.pop('appnode'))
self.server_name = util.HostIPPort(app_dict.pop('fqdn'))
self.catchall = find_catchall_for_app(self.server_name.fqdn,
app_dict.pop('catchall', None),
ff_ssl_catchall)
self.client_max_body_size = app_dict.pop('client_max_body_size', '1024M')
self.hsts_max_age = app_dict.pop('hsts_max_age', None)
self.x_frame_options = app_dict.pop('x_frame_options', None)
self.ssl = app_dict.pop('ssl', self.catchall.ssl)
self.ssl_client_certificate = app_dict.pop('ssl_client_certificate', None)
self.ssl_crl = app_dict.pop('ssl_crl', None)
self.ssl_verify_client = app_dict.pop('ssl_verify_client', 'on')
server_name_ips = self.server_name.addresses
catchall_ips = util.flatten([listen.addresses
for listen in self.catchall.listen])
if len(set(server_name_ips) - set(catchall_ips)) > 0:
logger.warn("%s %s (%s) resolves to [%s] but catchall (%s) listens on [%s]" %
(type(self).__name__, self.name, self.server_name.fqdn,
', '.join([str(x) for x in server_name_ips]),
self.catchall.name,
', '.join([str(x) for x in catchall_ips])))
def load(config):
logger.trace("config: %s" % config)
icmp_stateful = config.pop('icmp_stateful', True)
ipv6_nat = config.pop('ipv6_nat', False)
interfaces = _expand_interfaces(config.pop('interfaces', {}))
input_ssh_from = check_wildcard(config.pop('input_ssh_from', []))
input_munin_from = check_wildcard(config.pop('input_munin_from', None))
input_nrpe_from = check_wildcard(config.pop('input_nrpe_from', None))
input_dns_from = check_wildcard(config.pop('input_dns_from', None))
input_dns_notrack = config.pop('input_dns_notrack', False)
input_http_from = check_wildcard(config.pop('input_http_from', None))
input_http_port = check_wildcard(config.pop('input_http_port', [80, 443]))
input_http_notrack = config.pop('input_http_notrack', False)
input_smtp_from = check_wildcard(config.pop('input_smtp_from', None))
input_postgresql_from = check_wildcard(config.pop('input_postgresql_from', None))
input_xmpp_c2s_from = check_wildcard(config.pop('input_xmpp_c2s_from', None))
input_nsca_from = check_wildcard(config.pop('input_nsca_from', None))
output_dns_to = check_wildcard(config.pop('output_dns_to', []))
output_ntp_to = check_wildcard(config.pop('output_ntp_to', []))
output_http_to = check_wildcard(config.pop('output_http_to', None))
output_http_port = check_wildcard(config.pop('output_http_port', [80, 443]))
output_smtp_to = check_wildcard(config.pop('output_smtp_to', []))
output_munin_to = check_wildcard(config.pop('output_munin_to', None))
output_nsca_to = check_wildcard(config.pop('output_nsca_to', None))
output_postgresql_to = check_wildcard(config.pop('output_postgresql_to', None))
output_xmpp_c2s_to = check_wildcard(config.pop('output_xmpp_c2s_to', None))
output_user = config.pop('output_user', None)
output_group = config.pop('output_group', None)
xmpp_s2s_fromto = check_wildcard(config.pop('xmpp_s2s_fromto', None))
gre_peers = check_wildcard(config.pop('gre_peers', None))
if any([input_dns_notrack, input_http_notrack]):
logger.debug("notrack option set, early accepting icmp")
icmp_stateful = False
input_tcp = config.pop('input_tcp', [])
input_udp = config.pop('input_udp', [])
output_tcp = config.pop('output_tcp', [])
output_udp = config.pop('output_udp', [])
custom = _custom_rules(config.pop('custom', {}), interfaces)
input_log_ignore = config.pop('input_log_ignore', None)
input_log_limit = config.pop('input_log_limit', None)
input_log_burst = config.pop('input_log_burst', None)
output_log_ignore = config.pop('output_log_ignore', None)
output_log_limit = config.pop('output_log_limit', None)
output_log_burst = config.pop('output_log_burst', None)
forwarding = False
stateful_forward = config.pop('stateful_forward', True)
customer_ipsec_gateway = util.flatten(config.pop('customer_ipsec_gateway', []))
if len(customer_ipsec_gateway) > 0:
logger.debug("customer ipsec gateway set, enabling forwarding")
forwarding = True
fh = IPTablesHostsAllow()
fh.fw.enable_ipv6_nat(ipv6_nat)
logger.debug("creating rules for early phase")
fh.add(libow.early_lo())
if input_dns_from is not None and input_dns_notrack is True:
fh.add(libow.input_dns(input_dns_from, input_dns_notrack))
if input_http_from is not None and input_http_notrack is True:
fh.add(libow.input_http(input_http_from, input_http_port, input_http_notrack))
fh.add(custom['early'].values())
logger.debug("creating rules for start phase")
if icmp_stateful is False:
fh.add(libow.input_icmp())
fh.add(libow.output_icmp())
fh.add(libow.start('INPUT'))
fh.add(libow.start('OUTPUT'))
if icmp_stateful is True:
fh.add(libow.stateful_input_icmp())
fh.add(libow.output_icmp())
if forwarding is True:
if stateful_forward is True:
fh.add(libow.start('FORWARD'))
fh.add(libow.forward_icmp())
fh.add(custom['start'].values())
logger.debug("creating rules for middle phase")
if input_ssh_from is not None:
fh.add(libow.input_ssh(input_ssh_from))
if input_munin_from is not None:
fh.add(libow.input_tcp(input_munin_from, 4949))
if input_nrpe_from is not None:
fh.add(libow.input_nrpe(input_nrpe_from))
if input_dns_from is not None and input_dns_notrack is False:
fh.add(libow.input_dns(input_dns_from, input_dns_notrack))
if input_http_from is not None and input_http_notrack is False:
fh.add(libow.input_http(input_http_from, input_http_port, input_http_notrack))
if input_smtp_from is not None:
fh.add(libow.input_tcp(input_smtp_from, 25))
if input_postgresql_from is not None:
fh.add(libow.input_tcp(input_postgresql_from, 5432))
if input_xmpp_c2s_from is not None:
fh.add(libow.input_tcp(input_xmpp_c2s_from, 5222))
fh.add(libow.input_tcp([], 7777)) # XXX: unfiltered?
for rule in input_tcp:
comment = rule.get('comment', None)
s = check_wildcard(rule.get('from', []))
port = rule.get('port', None)
fh.add(libow.input_tcp(comment=comment, s=s, port=port))
for rule in input_udp:
comment = rule.get('comment', None)
s = check_wildcard(rule.get('from', []))
port = rule.get('port', None)
fh.add(libow.input_udp(comment=comment, s=s, port=port))
if input_nsca_from is not None:
fh.add(libow.input_tcp(input_nsca_from, 5667))
if xmpp_s2s_fromto is not None:
fh.add(libow.input_tcp(xmpp_s2s_fromto, 5269))
if gre_peers is not None:
fh.add(libow.input_gre(gre_peers))
if output_dns_to is not None:
fh.add(libow.output_dns(output_dns_to))
if output_ntp_to is not None:
fh.add(libow.output_udp(output_ntp_to, 123, uid='ntp'))
if output_http_to is not None:
fh.add(libow.output_http(output_http_to, output_http_port))
if output_smtp_to is not None:
fh.add(libow.output_tcp(output_smtp_to, 25, uid='postfix'))
if output_munin_to is not None:
fh.add(libow.output_tcp(output_munin_to, 4949, uid='munin'))
if output_nsca_to is not None:
fh.add(libow.output_tcp(output_nsca_to, 5667))
if output_postgresql_to is not None:
fh.add(libow.output_tcp(output_postgresql_to, 5432))
if output_xmpp_c2s_to is not None:
fh.add(libow.output_tcp(output_xmpp_c2s_to, 5222))
if xmpp_s2s_fromto is not None:
fh.add(libow.output_tcp(xmpp_s2s_fromto, 5269, uid='ejabberd'))
if gre_peers is not None:
fh.add(libow.output_gre(gre_peers))
for rule in output_tcp:
comment = rule.get('comment', None)
d = check_wildcard(rule.get('to', []))
port = rule.get('port', None)
uid = rule.get('uid', None)
fh.add(libow.output_tcp(comment=comment, d=d, port=port, uid=uid))
for rule in output_udp:
comment = rule.get('comment', None)
d = check_wildcard(rule.get('to', []))
port = rule.get('port', None)
uid = rule.get('uid', None)
fh.add(libow.output_udp(comment=comment, d=d, port=port, uid=uid))
if output_user is not None:
output_user = util.flatten(output_user)
for user in output_user:
if isinstance(user, str):
fh.add(libow.output_tcp(d=[], uid=user))
elif isinstance(user, int):
fh.add(libow.output_tcp(d=[], uid=str(user)))
else:
raise Exception("don't understand output_user %s" % user)
if output_group is not None:
output_group = util.flatten(output_group)
for group in output_group:
if isinstance(group, str):
fh.add(libow.output_tcp(d=[], gid=group))
elif isinstance(group, int):
fh.add(libow.output_tcp(d=[], gid=str(group)))
else:
raise Exception("don't understand output_group %s" % group)
if len(customer_ipsec_gateway) > 0:
for cig in customer_ipsec_gateway:
fh.add(libow.customer_ipsec_gateway(
remote_endpoint=cig['remote_endpoint'],
remote_subnets=cig['remote_subnets'],
local_subnets=cig['local_subnets'],
allow_incoming_traffic=cig.get('allow_incoming_traffic', False),
snat=cig.get('snat', None)
))
fh.add(custom['middle'].values())
logger.debug("creating rules for end phase")
fh.add(libow.input_traceroute())
fh.add(libow.output_beheer_root())
fh.add(custom['end'].values())
logger.debug("creating rules for late phase")
fh.add(libow.log('INPUT', input_log_ignore, input_log_limit, input_log_burst))
fh.add(libow.log('OUTPUT', output_log_ignore, output_log_limit, output_log_burst))
fh.add(custom['late'].values())
for hosts_allow in config.pop('hosts_allow', []):
daemon = hosts_allow.pop('daemon')
s = hosts_allow.pop('from', None)
if '*' in util.flatten(s):
s = 'all'
if len(hosts_allow) > 0:
logger.warn("Unrecognized options in hosts_allow rule: %s" % hosts_allow)
fh.add(libow.hosts_allow(daemon, s))
firewall_lines = fh.fw.get_iptables_restore_script(4).splitlines()
firewall6_lines = fh.fw.get_iptables_restore_script(6).splitlines()
hosts_allow_lines = fh.ha.get_hosts_allow_content().splitlines()
additional_config = None
def run(outdir, diff, no_write, no_exec, no_git):
if any([
util.write_file(outdir, 'network/firewall', firewall_lines, no_write, diff),
util.write_file(outdir, 'network/firewall6', firewall6_lines, no_write, diff),
util.write_file(outdir, 'hosts.allow', hosts_allow_lines, no_write, diff),
]):
if os.geteuid() == 0:
if no_exec is True:
util.cmd(('/sbin/iptables-restore', '-t'), dry_run=False, stdin=firewall_lines)
util.cmd(('/sbin/ip6tables-restore', '-t'),
dry_run=False, stdin=firewall6_lines)
else:
util.cmd(('/sbin/iptables-restore'), dry_run=False, stdin=firewall_lines)
util.cmd(('/sbin/ip6tables-restore'), dry_run=False, stdin=firewall6_lines)
util.git_commit(outdir, ['network/firewall', 'network/firewall6', 'hosts.allow'],
no_git, 'firewall')
return run, additional_config
def server_name(self, server_name):
self._server_name = util.flatten(server_name)
def listen(self, listen):
listen = util.flatten(listen)
if not all([isinstance(l, util.HostIPPort) for l in listen]):
raise ValueError("Server listen address needs to be HostIPPort")
self._listen = listen
def server(self, server):
self._server = util.flatten(server)
def backup_server(self, backup_server):
self._backup_server = util.flatten(backup_server)