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executable file
·1495 lines (1264 loc) · 54 KB
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#!/usr/bin/python
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
# Version @VERSION@
#
# A plugin for executing script needed by vmops cloud
import os, sys, time
import XenAPIPlugin
if os.path.exists("/opt/xensource/sm"):
sys.path.extend(["/opt/xensource/sm/", "/usr/local/sbin/", "/sbin/"])
if os.path.exists("/usr/lib/xcp/sm"):
sys.path.extend(["/usr/lib/xcp/sm/", "/usr/local/sbin/", "/sbin/"])
import base64
import socket
import stat
import tempfile
import util
import subprocess
import zlib
import cloudstack_pluginlib as lib
import logging
from util import CommandException
lib.setup_logging("/var/log/cloud/vmops.log")
def echo(fn):
def wrapped(*v, **k):
name = fn.__name__
logging.debug("#### VMOPS enter %s ####" % name )
res = fn(*v, **k)
logging.debug("#### VMOPS exit %s ####" % name )
return res
return wrapped
@echo
def add_to_VCPUs_params_live(session, args):
key = args['key']
value = args['value']
vmname = args['vmname']
try:
cmd = ["bash", "/opt/cloud/bin/add_to_vcpus_params_live.sh", vmname, key, value]
txt = util.pread2(cmd)
except:
return 'false'
return 'true'
@echo
def setup_iscsi(session, args):
uuid=args['uuid']
try:
cmd = ["bash", "/opt/cloud/bin/setup_iscsi.sh", uuid]
txt = util.pread2(cmd)
except:
txt = ''
return txt
@echo
def getgateway(session, args):
mgmt_ip = args['mgmtIP']
try:
cmd = ["bash", "/opt/cloud/bin/network_info.sh", "-g", mgmt_ip]
txt = util.pread2(cmd)
except:
txt = ''
return txt
@echo
def preparemigration(session, args):
uuid = args['uuid']
try:
cmd = ["/opt/cloud/bin/make_migratable.sh", uuid]
util.pread2(cmd)
txt = 'success'
except:
logging.debug("Catch prepare migration exception" )
txt = ''
return txt
@echo
def setIptables(session, args):
try:
cmd = ["/bin/bash", "/opt/cloud/bin/setupxenserver.sh"]
txt = util.pread2(cmd)
txt = 'success'
except:
logging.debug(" setIptables execution failed " )
txt = ''
return txt
@echo
def pingdomr(session, args):
host = args['host']
port = args['port']
socket.setdefaulttimeout(3)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
s.connect((host,int(port)))
txt = 'success'
except:
txt = ''
s.close()
return txt
@echo
def kill_copy_process(session, args):
namelabel = args['namelabel']
try:
cmd = ["bash", "/opt/cloud/bin/kill_copy_process.sh", namelabel]
txt = util.pread2(cmd)
except:
txt = 'false'
return txt
@echo
def pingxenserver(session, args):
txt = 'success'
return txt
def pingtest(session, args):
sargs = args['args']
cmd = sargs.split(' ')
cmd.insert(0, "/opt/cloud/bin/pingtest.sh")
cmd.insert(0, "/bin/bash")
try:
txt = util.pread2(cmd)
txt = 'success'
except:
logging.debug(" pingtest failed " )
txt = ''
return txt
@echo
def setLinkLocalIP(session, args):
brName = args['brName']
try:
cmd = ["ip", "route", "del", "169.254.0.0/16"]
txt = util.pread2(cmd)
except:
txt = ''
try:
cmd = ["ifconfig", brName, "169.254.0.1", "netmask", "255.255.0.0"]
txt = util.pread2(cmd)
except:
try:
cmd = ['cat', '/etc/xensource/network.conf']
result = util.pread2(cmd)
except:
return 'can not cat network.conf'
if result.lower().strip() == "bridge":
try:
cmd = ["brctl", "addbr", brName]
txt = util.pread2(cmd)
except:
pass
else:
try:
cmd = ["ovs-vsctl", "add-br", brName]
txt = util.pread2(cmd)
except:
pass
try:
cmd = ["ifconfig", brName, "169.254.0.1", "netmask", "255.255.0.0"]
txt = util.pread2(cmd)
except:
pass
try:
cmd = ["ip", "route", "add", "169.254.0.0/16", "dev", brName, "src", "169.254.0.1"]
txt = util.pread2(cmd)
except:
txt = ''
txt = 'success'
return txt
@echo
def createFile(session, args):
file_path = args['filepath']
file_contents = args['filecontents']
try:
f = open(file_path, "w")
f.write(file_contents)
f.close()
txt = 'success'
except:
logging.debug(" failed to create HA proxy cfg file ")
txt = ''
return txt
@echo
def createFileInDomr(session, args):
file_path = args['filepath']
file_contents = args['filecontents']
domrip = args['domrip']
try:
tmpfile = util.pread2(['mktemp']).strip()
f = open(tmpfile, "w")
f.write(file_contents)
f.close()
target = "root@" + domrip + ":" + file_path
txt = util.pread2(['scp','-P','3922','-q','-o','StrictHostKeyChecking=no','-i','/root/.ssh/id_rsa.cloud',tmpfile, target])
util.pread2(['rm',tmpfile])
txt = 'succ#' + txt
except:
logging.debug("failed to create file " + file_path + " in VR, contain: " + file_contents)
txt = 'fail#' + txt
return txt
@echo
def deleteFile(session, args):
file_path = args["filepath"]
try:
if os.path.isfile(file_path):
os.remove(file_path)
txt = 'success'
except:
logging.debug(" failed to remove HA proxy cfg file ")
txt = ''
return txt
def chain_name(vm_name):
if vm_name.startswith('i-') or vm_name.startswith('r-'):
if vm_name.endswith('untagged'):
return '-'.join(vm_name.split('-')[:-1])
return vm_name
def chain_name_def(vm_name):
if vm_name.startswith('i-'):
if vm_name.endswith('untagged'):
return '-'.join(vm_name.split('-')[:-2]) + "-def"
return '-'.join(vm_name.split('-')[:-1]) + "-def"
return vm_name
def egress_chain_name(vm_name):
return chain_name(vm_name) + "-eg"
@echo
def can_bridge_firewall(session, args):
try:
util.pread2(['ebtables', '-V'])
util.pread2(['ipset', '-V'])
cmd = ['cat', '/etc/xensource/network.conf']
result = util.pread2(cmd)
if result.lower().strip() != "bridge":
return 'false'
except:
return 'false'
try:
util.pread2(['iptables', '-N', 'BRIDGE-FIREWALL'])
util.pread2(['iptables', '-I', 'BRIDGE-FIREWALL', '-m', 'state', '--state', 'RELATED,ESTABLISHED', '-j', 'ACCEPT'])
util.pread2(['iptables', '-A', 'BRIDGE-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '-p', 'udp', '--dport', '67', '--sport', '68', '-j', 'ACCEPT'])
util.pread2(['iptables', '-A', 'BRIDGE-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '-p', 'udp', '--dport', '68', '--sport', '67', '-j', 'ACCEPT'])
util.pread2(['iptables', '-D', 'FORWARD', '-j', 'RH-Firewall-1-INPUT'])
except:
logging.debug('Chain BRIDGE-FIREWALL already exists')
try:
util.pread2(['iptables', '-N', 'BRIDGE-DEFAULT-FIREWALL'])
util.pread2(['iptables', '-A', 'BRIDGE-DEFAULT-FIREWALL', '-m', 'state', '--state', 'RELATED,ESTABLISHED', '-j', 'ACCEPT'])
util.pread2(['iptables', '-A', 'BRIDGE-DEFAULT-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '-p', 'udp', '--dport', '67', '--sport', '68', '-j', 'ACCEPT'])
util.pread2(['iptables', '-A', 'BRIDGE-DEFAULT-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '-p', 'udp', '--dport', '68', '--sport', '67', '-j', 'ACCEPT'])
util.pread2(['iptables', '-I', 'BRIDGE-FIREWALL', '-j', 'BRIDGE-DEFAULT-FIREWALL'])
util.pread2(['iptables', '-D', 'BRIDGE-FIREWALL', '-m', 'state', '--state', 'RELATED,ESTABLISHED', '-j', 'ACCEPT'])
util.pread2(['iptables', '-D', 'BRIDGE-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '-p', 'udp', '--dport', '67', '--sport', '68', '-j', 'ACCEPT'])
util.pread2(['iptables', '-D', 'BRIDGE-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '-p', 'udp', '--dport', '68', '--sport', '67', '-j', 'ACCEPT'])
except:
logging.debug('Chain BRIDGE-DEFAULT-FIREWALL already exists')
result = 'true'
try:
util.pread2(['/bin/bash', '-c', 'iptables -n -L FORWARD | grep BRIDGE-FIREWALL'])
except:
try:
util.pread2(['iptables', '-I', 'FORWARD', '-m', 'physdev', '--physdev-is-bridged', '-j', 'BRIDGE-FIREWALL'])
util.pread2(['iptables', '-A', 'FORWARD', '-j', 'DROP'])
except:
return 'false'
default_ebtables_rules()
allow_egress_traffic(session)
if not os.path.exists('/var/run/cloud'):
os.makedirs('/var/run/cloud')
if not os.path.exists('/var/cache/cloud'):
os.makedirs('/var/cache/cloud')
#get_ipset_keyword()
cleanup_rules_for_dead_vms(session)
cleanup_rules(session, args)
return result
@echo
def default_ebtables_rules():
try:
util.pread2(['ebtables', '-N', 'DEFAULT_EBTABLES'])
util.pread2(['ebtables', '-A', 'FORWARD', '-j' 'DEFAULT_EBTABLES'])
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'IPv4', '--ip-dst', '255.255.255.255', '--ip-proto', 'udp', '--ip-dport', '67', '-j', 'ACCEPT'])
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'IPv4', '--ip-dst', '255.255.255.255', '--ip-proto', 'udp', '--ip-dport', '68', '-j', 'ACCEPT'])
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'ARP', '--arp-op', 'Request', '-j', 'ACCEPT'])
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'ARP', '--arp-op', 'Reply', '-j', 'ACCEPT'])
# deny mac broadcast and multicast
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'IPv4', '-d', 'Broadcast', '-j', 'DROP'])
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'IPv4', '-d', 'Multicast', '-j', 'DROP'])
# deny ip broadcast and multicast
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'IPv4', '--ip-dst', '255.255.255.255', '-j', 'DROP'])
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'IPv4', '--ip-dst', '224.0.0.0/4', '-j', 'DROP'])
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'IPv4', '-j', 'RETURN'])
# deny ipv6
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', 'IPv6', '-j', 'DROP'])
# deny vlan
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-p', '802_1Q', '-j', 'DROP'])
# deny all others (e.g., 802.1d, CDP)
util.pread2(['ebtables', '-A', 'DEFAULT_EBTABLES', '-j', 'DROP'])
except:
logging.debug('Chain DEFAULT_EBTABLES already exists')
@echo
def allow_egress_traffic(session):
devs = []
for pif in session.xenapi.PIF.get_all():
pif_rec = session.xenapi.PIF.get_record(pif)
dev = pif_rec.get('device')
devs.append(dev + "+")
for d in devs:
try:
util.pread2(['/bin/bash', '-c', "iptables -n -L FORWARD | grep '%s '" % d])
except:
try:
util.pread2(['iptables', '-I', 'FORWARD', '2', '-m', 'physdev', '--physdev-is-bridged', '--physdev-out', d, '-j', 'ACCEPT'])
except:
logging.debug("Failed to add FORWARD rule through to %s" % d)
return 'false'
return 'true'
def ipset(ipsetname, proto, start, end, ips):
try:
util.pread2(['ipset', '-N', ipsetname, 'iptreemap'])
except:
logging.debug("ipset chain already exists" + ipsetname)
result = True
ipsettmp = ''.join(''.join(ipsetname.split('-')).split('_')) + str(int(time.time()) % 1000)
try:
util.pread2(['ipset', '-N', ipsettmp, 'iptreemap'])
except:
logging.debug("Failed to create temp ipset, reusing old name= " + ipsettmp)
try:
util.pread2(['ipset', '-F', ipsettmp])
except:
logging.debug("Failed to clear old temp ipset name=" + ipsettmp)
return False
try:
for ip in ips:
try:
util.pread2(['ipset', '-A', ipsettmp, ip])
except CommandException, cex:
if cex.reason.rfind('already in set') == -1:
raise
except:
logging.debug("Failed to program ipset " + ipsetname)
util.pread2(['ipset', '-F', ipsettmp])
util.pread2(['ipset', '-X', ipsettmp])
return False
try:
util.pread2(['ipset', '-W', ipsettmp, ipsetname])
except:
logging.debug("Failed to swap ipset " + ipsetname)
result = False
try:
util.pread2(['ipset', '-F', ipsettmp])
util.pread2(['ipset', '-X', ipsettmp])
except:
# if the temporary name clashes next time we'll just reuse it
logging.debug("Failed to delete temp ipset " + ipsettmp)
return result
@echo
def destroy_network_rules_for_vm(session, args):
vm_name = args.pop('vmName')
vmchain = chain_name(vm_name)
vmchain_egress = egress_chain_name(vm_name)
vmchain_default = chain_name_def(vm_name)
delete_rules_for_vm_in_bridge_firewall_chain(vm_name)
if vm_name.startswith('i-') or vm_name.startswith('r-') or vm_name.startswith('l-'):
try:
util.pread2(['iptables', '-F', vmchain_default])
util.pread2(['iptables', '-X', vmchain_default])
except:
logging.debug("Ignoring failure to delete chain " + vmchain_default)
destroy_ebtables_rules(vmchain)
destroy_arptables_rules(vmchain)
try:
util.pread2(['iptables', '-F', vmchain])
util.pread2(['iptables', '-X', vmchain])
except:
logging.debug("Ignoring failure to delete ingress chain " + vmchain)
try:
util.pread2(['iptables', '-F', vmchain_egress])
util.pread2(['iptables', '-X', vmchain_egress])
except:
logging.debug("Ignoring failure to delete egress chain " + vmchain_egress)
remove_rule_log_for_vm(vm_name)
remove_secip_log_for_vm(vm_name)
if 1 in [ vm_name.startswith(c) for c in ['r-', 's-', 'v-', 'l-'] ]:
return 'true'
try:
setscmd = "ipset --save | grep " + vmchain + " | grep '^-N' | awk '{print $2}'"
setsforvm = util.pread2(['/bin/bash', '-c', setscmd]).split('\n')
for set in setsforvm:
if set != '':
util.pread2(['ipset', '-F', set])
util.pread2(['ipset', '-X', set])
except:
logging.debug("Failed to destroy ipsets for %" % vm_name)
return 'true'
@echo
def destroy_ebtables_rules(vm_chain):
delcmd = "ebtables-save | grep " + vm_chain + " | sed 's/-A/-D/'"
delcmds = util.pread2(['/bin/bash', '-c', delcmd]).split('\n')
delcmds.pop()
for cmd in delcmds:
try:
dc = cmd.split(' ')
dc.insert(0, 'ebtables')
util.pread2(dc)
except:
logging.debug("Ignoring failure to delete ebtables rules for vm " + vm_chain)
try:
util.pread2(['ebtables', '-F', vm_chain])
util.pread2(['ebtables', '-X', vm_chain])
except:
logging.debug("Ignoring failure to delete ebtables chain for vm " + vm_chain)
@echo
def destroy_arptables_rules(vm_chain):
delcmd = "arptables -vL FORWARD | grep " + vm_chain + " | sed 's/-i any//' | sed 's/-o any//' | awk '{print $1,$2,$3,$4}' "
delcmds = util.pread2(['/bin/bash', '-c', delcmd]).split('\n')
delcmds.pop()
for cmd in delcmds:
try:
dc = cmd.split(' ')
dc.insert(0, 'arptables')
dc.insert(1, '-D')
dc.insert(2, 'FORWARD')
util.pread2(dc)
except:
logging.debug("Ignoring failure to delete arptables rules for vm " + vm_chain)
try:
util.pread2(['arptables', '-F', vm_chain])
util.pread2(['arptables', '-X', vm_chain])
except:
logging.debug("Ignoring failure to delete arptables chain for vm " + vm_chain)
@echo
def default_ebtables_antispoof_rules(vm_chain, vifs, vm_ip, vm_mac):
if vm_mac == 'ff:ff:ff:ff:ff:ff':
logging.debug("Ignoring since mac address is not valid")
return 'true'
try:
util.pread2(['ebtables', '-N', vm_chain])
except:
try:
util.pread2(['ebtables', '-F', vm_chain])
except:
logging.debug("Failed to create ebtables antispoof chain, skipping")
return 'true'
# note all rules for packets into the bridge (-i) precede all output rules (-o)
# always start after the first rule in the FORWARD chain that jumps to DEFAULT_EBTABLES chain
try:
for vif in vifs:
util.pread2(['ebtables', '-I', 'FORWARD', '2', '-i', vif, '-j', vm_chain])
util.pread2(['ebtables', '-A', 'FORWARD', '-o', vif, '-j', vm_chain])
except:
logging.debug("Failed to program default ebtables FORWARD rules for %s" % vm_chain)
return 'false'
try:
for vif in vifs:
# only allow source mac that belongs to the vm
try:
util.pread2(['ebtables', '-t', 'nat', '-I', 'PREROUTING', '-i', vif, '-s', '!' , vm_mac, '-j', 'DROP'])
except:
util.pread2(['ebtables', '-A', vm_chain, '-i', vif, '-s', '!', vm_mac, '-j', 'DROP'])
# do not allow fake dhcp responses
util.pread2(['ebtables', '-A', vm_chain, '-i', vif, '-p', 'IPv4', '--ip-proto', 'udp', '--ip-dport', '68', '-j', 'DROP'])
# do not allow snooping of dhcp requests
util.pread2(['ebtables', '-A', vm_chain, '-o', vif, '-p', 'IPv4', '--ip-proto', 'udp', '--ip-dport', '67', '-j', 'DROP'])
except:
logging.debug("Failed to program default ebtables antispoof rules for %s" % vm_chain)
return 'false'
return 'true'
@echo
def default_arp_antispoof(vm_chain, vifs, vm_ip, vm_mac):
if vm_mac == 'ff:ff:ff:ff:ff:ff':
logging.debug("Ignoring since mac address is not valid")
return 'true'
try:
util.pread2(['arptables', '-N', vm_chain])
except:
try:
util.pread2(['arptables', '-F', vm_chain])
except:
logging.debug("Failed to create arptables rule, skipping")
return 'true'
# note all rules for packets into the bridge (-i) precede all output rules (-o)
try:
for vif in vifs:
util.pread2(['arptables', '-I', 'FORWARD', '-i', vif, '-j', vm_chain])
util.pread2(['arptables', '-A', 'FORWARD', '-o', vif, '-j', vm_chain])
except:
logging.debug("Failed to program default arptables rules in FORWARD chain vm=" + vm_chain)
return 'false'
try:
for vif in vifs:
#accept arp replies into the bridge as long as the source mac and ips match the vm
util.pread2(['arptables', '-A', vm_chain, '-i', vif, '--opcode', 'Reply', '--source-mac', vm_mac, '--source-ip', vm_ip, '-j', 'ACCEPT'])
#accept any arp requests from this vm. In the future this can be restricted to deny attacks on hosts
#also important to restrict source ip and src mac in these requests as they can be used to update arp tables on destination
util.pread2(['arptables', '-A', vm_chain, '-i', vif, '--opcode', 'Request', '--source-mac', vm_mac, '--source-ip', vm_ip, '-j', 'RETURN'])
#accept any arp requests to this vm as long as the request is for this vm's ip
util.pread2(['arptables', '-A', vm_chain, '-o', vif, '--opcode', 'Request', '--destination-ip', vm_ip, '-j', 'ACCEPT'])
#accept any arp replies to this vm as long as the mac and ip matches
util.pread2(['arptables', '-A', vm_chain, '-o', vif, '--opcode', 'Reply', '--destination-mac', vm_mac, '--destination-ip', vm_ip, '-j', 'ACCEPT'])
util.pread2(['arptables', '-A', vm_chain, '-j', 'DROP'])
except:
logging.debug("Failed to program default arptables rules")
return 'false'
return 'true'
@echo
def network_rules_vmSecondaryIp(session, args):
vm_name = args.pop('vmName')
vm_mac = args.pop('vmMac')
ip_secondary = args.pop('vmSecIp')
action = args.pop('action')
logging.debug("vmMac = "+ vm_mac)
logging.debug("vmName = "+ vm_name)
#action = "-A"
logging.debug("action = "+ action)
try:
vm = session.xenapi.VM.get_by_name_label(vm_name)
if len(vm) != 1:
return 'false'
vm_rec = session.xenapi.VM.get_record(vm[0])
vm_vifs = vm_rec.get('VIFs')
vifnums = [session.xenapi.VIF.get_record(vif).get('device') for vif in vm_vifs]
domid = vm_rec.get('domid')
except:
logging.debug("### Failed to get domid or vif list for vm ##" + vm_name)
return 'false'
if domid == '-1':
logging.debug("### Failed to get domid for vm (-1): " + vm_name)
return 'false'
vifs = ["vif" + domid + "." + v for v in vifnums]
#vm_name = '-'.join(vm_name.split('-')[:-1])
vmchain = chain_name(vm_name)
add_to_ipset(vmchain, [ip_secondary], action)
#add arptables rules for the secondary ip
arp_rules_vmip(vmchain, vifs, [ip_secondary], vm_mac, action)
return 'true'
@echo
def default_network_rules_systemvm(session, args):
try:
util.pread2(['/bin/bash', '-c', 'iptables -n -L FORWARD | grep BRIDGE-FIREWALL'])
except:
can_bridge_firewall(session, args)
vm_name = args.pop('vmName')
try:
vm = session.xenapi.VM.get_by_name_label(vm_name)
if len(vm) != 1:
return 'false'
vm_rec = session.xenapi.VM.get_record(vm[0])
vm_vifs = vm_rec.get('VIFs')
vifnums = [session.xenapi.VIF.get_record(vif).get('device') for vif in vm_vifs]
domid = vm_rec.get('domid')
except:
logging.debug("### Failed to get domid or vif list for vm ##" + vm_name)
return 'false'
if domid == '-1':
logging.debug("### Failed to get domid for vm (-1): " + vm_name)
return 'false'
vifs = ["vif" + domid + "." + v for v in vifnums]
#vm_name = '-'.join(vm_name.split('-')[:-1])
vmchain = chain_name(vm_name)
delete_rules_for_vm_in_bridge_firewall_chain(vm_name)
try:
util.pread2(['iptables', '-N', vmchain])
except:
util.pread2(['iptables', '-F', vmchain])
for vif in vifs:
try:
util.pread2(['iptables', '-A', 'BRIDGE-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '--physdev-out', vif, '-j', vmchain])
util.pread2(['iptables', '-I', 'BRIDGE-FIREWALL', '2', '-m', 'physdev', '--physdev-is-bridged', '--physdev-in', vif, '-j', vmchain])
util.pread2(['iptables', '-I', vmchain, '-m', 'physdev', '--physdev-is-bridged', '--physdev-in', vif, '-j', 'RETURN'])
except:
logging.debug("Failed to program default rules")
return 'false'
util.pread2(['iptables', '-A', vmchain, '-j', 'ACCEPT'])
if write_rule_log_for_vm(vm_name, '-1', '_ignore_', domid, '_initial_', '-1') == False:
logging.debug("Failed to log default network rules for systemvm, ignoring")
return 'true'
@echo
def create_ipset_forvm (ipsetname):
result = True
try:
logging.debug("Creating ipset chain .... " + ipsetname)
util.pread2(['ipset', '-F', ipsetname])
util.pread2(['ipset', '-X', ipsetname])
util.pread2(['ipset', '-N', ipsetname, 'iphash'])
except:
logging.debug("ipset chain not exists creating.... " + ipsetname)
util.pread2(['ipset', '-N', ipsetname, 'iphash'])
return result
@echo
def add_to_ipset(ipsetname, ips, action):
result = True
for ip in ips:
try:
logging.debug("vm ip " + ip)
util.pread2(['ipset', action, ipsetname, ip])
except:
logging.debug("vm ip alreday in ip set" + ip)
continue
return result
@echo
def arp_rules_vmip (vm_chain, vifs, ips, vm_mac, action):
try:
if action == "-A":
action = "-I"
for vif in vifs:
for vm_ip in ips:
#accept any arp requests to this vm as long as the request is for this vm's ip
util.pread2(['arptables', action, vm_chain, '-o', vif, '--opcode', 'Request', '--destination-ip', vm_ip, '-j', 'ACCEPT'])
#accept any arp replies to this vm as long as the mac and ip matches
util.pread2(['arptables', action, vm_chain, '-o', vif, '--opcode', 'Reply', '--destination-mac', vm_mac, '--destination-ip', vm_ip, '-j', 'ACCEPT'])
#accept arp replies into the bridge as long as the source mac and ips match the vm
util.pread2(['arptables', action, vm_chain, '-i', vif, '--opcode', 'Reply', '--source-mac', vm_mac, '--source-ip', vm_ip, '-j', 'ACCEPT'])
#accept any arp requests from this vm. In the future this can be restricted to deny attacks on hosts
#also important to restrict source ip and src mac in these requests as they can be used to update arp tables on destination
util.pread2(['arptables', action, vm_chain, '-i', vif, '--opcode', 'Request', '--source-mac', vm_mac, '--source-ip', vm_ip, '-j', 'RETURN'])
except:
logging.debug("Failed to program arptables rules for ip")
return 'false'
return 'true'
@echo
def default_network_rules(session, args):
vm_name = args.pop('vmName')
vm_ip = args.pop('vmIP')
vm_id = args.pop('vmID')
vm_mac = args.pop('vmMAC')
sec_ips = args.pop("secIps")
action = "-A"
try:
vm = session.xenapi.VM.get_by_name_label(vm_name)
if len(vm) != 1:
logging.debug("### Failed to get record for vm " + vm_name)
return 'false'
vm_rec = session.xenapi.VM.get_record(vm[0])
domid = vm_rec.get('domid')
except:
logging.debug("### Failed to get domid for vm " + vm_name)
return 'false'
if domid == '-1':
logging.debug("### Failed to get domid for vm (-1): " + vm_name)
return 'false'
vif = "vif" + domid + ".0"
tap = "tap" + domid + ".0"
vifs = [vif]
try:
util.pread2(['ifconfig', tap])
vifs.append(tap)
except:
pass
delete_rules_for_vm_in_bridge_firewall_chain(vm_name)
vmchain = chain_name(vm_name)
vmchain_egress = egress_chain_name(vm_name)
vmchain_default = chain_name_def(vm_name)
destroy_ebtables_rules(vmchain)
try:
util.pread2(['iptables', '-N', vmchain])
except:
util.pread2(['iptables', '-F', vmchain])
try:
util.pread2(['iptables', '-N', vmchain_egress])
except:
util.pread2(['iptables', '-F', vmchain_egress])
try:
util.pread2(['iptables', '-N', vmchain_default])
except:
util.pread2(['iptables', '-F', vmchain_default])
vmipset = vm_name
#create ipset and add vm ips to that ip set
if create_ipset_forvm(vmipset) == False:
logging.debug(" failed to create ipset for rule " + str(tokens))
return 'false'
#add primary nic ip to ipset
if add_to_ipset(vmipset, [vm_ip], action ) == False:
logging.debug(" failed to add vm " + vm_ip + " ip to set ")
return 'false'
#add secodnary nic ips to ipset
secIpSet = "1"
ips = sec_ips.split(':')
ips.pop()
if ips[0] == "0":
secIpSet = "0";
if secIpSet == "1":
logging.debug("Adding ipset for secondary ips")
add_to_ipset(vmipset, ips, action)
if write_secip_log_for_vm(vm_name, sec_ips, vm_id) == False:
logging.debug("Failed to log default network rules, ignoring")
keyword = '--' + get_ipset_keyword()
try:
for v in vifs:
util.pread2(['iptables', '-A', 'BRIDGE-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '--physdev-out', v, '-j', vmchain_default])
util.pread2(['iptables', '-I', 'BRIDGE-FIREWALL', '2', '-m', 'physdev', '--physdev-is-bridged', '--physdev-in', v, '-j', vmchain_default])
#don't let vm spoof its ip address
for v in vifs:
#util.pread2(['iptables', '-A', vmchain_default, '-m', 'physdev', '--physdev-is-bridged', '--physdev-in', v, '--source', vm_ip,'-p', 'udp', '--dport', '53', '-j', 'RETURN'])
util.pread2(['iptables', '-A', vmchain_default, '-m', 'physdev', '--physdev-is-bridged', '--physdev-in', v, '-m', 'set', keyword, vmipset, 'src', '-p', 'udp', '--dport', '53', '-j', 'RETURN'])
util.pread2(['iptables', '-A', vmchain_default, '-m', 'physdev', '--physdev-is-bridged', '--physdev-in', v, '-m', 'set', '!', keyword, vmipset, 'src', '-j', 'DROP'])
util.pread2(['iptables', '-A', vmchain_default, '-m', 'physdev', '--physdev-is-bridged', '--physdev-out', v, '-m', 'set', '!', keyword, vmipset, 'dst', '-j', 'DROP'])
util.pread2(['iptables', '-A', vmchain_default, '-m', 'physdev', '--physdev-is-bridged', '--physdev-in', v, '-m', 'set', keyword, vmipset, 'src', '-j', vmchain_egress])
util.pread2(['iptables', '-A', vmchain_default, '-m', 'physdev', '--physdev-is-bridged', '--physdev-out', v, '-j', vmchain])
except:
logging.debug("Failed to program default rules for vm " + vm_name)
return 'false'
default_arp_antispoof(vmchain, vifs, vm_ip, vm_mac)
#add default arp rules for secondary ips;
if secIpSet == "1":
logging.debug("Adding arp rules for sec ip")
arp_rules_vmip(vmchain, vifs, ips, vm_mac, action)
default_ebtables_antispoof_rules(vmchain, vifs, vm_ip, vm_mac)
if write_rule_log_for_vm(vm_name, vm_id, vm_ip, domid, '_initial_', '-1', vm_mac) == False:
logging.debug("Failed to log default network rules, ignoring")
logging.debug("Programmed default rules for vm " + vm_name)
return 'true'
@echo
def check_domid_changed(session, vmName):
curr_domid = '-1'
try:
vm = session.xenapi.VM.get_by_name_label(vmName)
if len(vm) != 1:
logging.debug("### Could not get record for vm ## " + vmName)
else:
vm_rec = session.xenapi.VM.get_record(vm[0])
curr_domid = vm_rec.get('domid')
except:
logging.debug("### Failed to get domid for vm ## " + vmName)
logfilename = "/var/run/cloud/" + vmName +".log"
if not os.path.exists(logfilename):
return ['-1', curr_domid]
lines = (line.rstrip() for line in open(logfilename))
[_vmName,_vmID,_vmIP,old_domid,_signature,_seqno, _vmMac] = ['_', '-1', '_', '-1', '_', '-1', 'ff:ff:ff:ff:ff:ff']
for line in lines:
try:
[_vmName,_vmID,_vmIP,old_domid,_signature,_seqno,_vmMac] = line.split(',')
except ValueError,v:
[_vmName,_vmID,_vmIP,old_domid,_signature,_seqno] = line.split(',')
break
return [curr_domid, old_domid]
@echo
def delete_rules_for_vm_in_bridge_firewall_chain(vmName):
vm_name = vmName
vmchain = chain_name_def(vm_name)
delcmd = "iptables-save | grep '\-A BRIDGE-FIREWALL' | grep " + vmchain + " | sed 's/-A/-D/'"
delcmds = util.pread2(['/bin/bash', '-c', delcmd]).split('\n')
delcmds.pop()
for cmd in delcmds:
try:
dc = cmd.split(' ')
dc.insert(0, 'iptables')
dc.pop()
util.pread2(filter(None, dc))
except:
logging.debug("Ignoring failure to delete rules for vm " + vmName)
@echo
def network_rules_for_rebooted_vm(session, vmName):
vm_name = vmName
[curr_domid, old_domid] = check_domid_changed(session, vm_name)
if curr_domid == old_domid:
return True
if old_domid == '-1':
return True
if curr_domid == '-1':
return True
logging.debug("Found a rebooted VM -- reprogramming rules for " + vm_name)
delete_rules_for_vm_in_bridge_firewall_chain(vm_name)
if 1 in [ vm_name.startswith(c) for c in ['r-', 's-', 'v-', 'l-'] ]:
default_network_rules_systemvm(session, {"vmName":vm_name})
return True
vif = "vif" + curr_domid + ".0"
tap = "tap" + curr_domid + ".0"
vifs = [vif]
try:
util.pread2(['ifconfig', tap])
vifs.append(tap)
except:
pass
vmchain = chain_name(vm_name)
vmchain_default = chain_name_def(vm_name)
for v in vifs:
util.pread2(['iptables', '-A', 'BRIDGE-FIREWALL', '-m', 'physdev', '--physdev-is-bridged', '--physdev-out', v, '-j', vmchain_default])
util.pread2(['iptables', '-I', 'BRIDGE-FIREWALL', '2', '-m', 'physdev', '--physdev-is-bridged', '--physdev-in', v, '-j', vmchain_default])
#change antispoof rule in vmchain
try:
delcmd = "iptables-save | grep '\-A " + vmchain_default + "' | grep physdev-in | sed 's/!--set/! --set/' | sed 's/-A/-D/'"
delcmd2 = "iptables-save | grep '\-A " + vmchain_default + "' | grep physdev-out | sed 's/!--set/! --set/'| sed 's/-A/-D/'"
inscmd = "iptables-save | grep '\-A " + vmchain_default + "' | grep physdev-in | grep vif | sed -r 's/vif[0-9]+.0/" + vif + "/' | sed 's/!--set/! --set/'"
inscmd2 = "iptables-save| grep '\-A " + vmchain_default + "' | grep physdev-in | grep tap | sed -r 's/tap[0-9]+.0/" + tap + "/' | sed 's/!--set/! --set/'"
inscmd3 = "iptables-save | grep '\-A " + vmchain_default + "' | grep physdev-out | grep vif | sed -r 's/vif[0-9]+.0/" + vif + "/' | sed 's/!--set/! --set/'"
inscmd4 = "iptables-save| grep '\-A " + vmchain_default + "' | grep physdev-out | grep tap | sed -r 's/tap[0-9]+.0/" + tap + "/' | sed 's/!--set/! --set/'"
ipts = []
for cmd in [delcmd, delcmd2, inscmd, inscmd2, inscmd3, inscmd4]:
cmds = util.pread2(['/bin/bash', '-c', cmd]).split('\n')
cmds.pop()
for c in cmds:
ipt = c.split(' ')
ipt.insert(0, 'iptables')
ipt.pop()
ipts.append(ipt)
for ipt in ipts:
try:
util.pread2(filter(None,ipt))
except:
logging.debug("Failed to rewrite antispoofing rules for vm " + vm_name)
except:
logging.debug("No rules found for vm " + vm_name)
destroy_ebtables_rules(vmchain)
destroy_arptables_rules(vmchain)
[vm_ip, vm_mac] = get_vm_mac_ip_from_log(vmchain)
default_arp_antispoof(vmchain, vifs, vm_ip, vm_mac)
#check wether the vm has secondary ips
if is_secondary_ips_set(vm_name) == True:
vmips = get_vm_sec_ips(vm_name)
#add arp rules for the secondaryp ip
for ip in vmips:
arp_rules_vmip(vmchain, vifs, [ip], vm_mac, "-A")
default_ebtables_antispoof_rules(vmchain, vifs, vm_ip, vm_mac)
rewrite_rule_log_for_vm(vm_name, curr_domid)
return True
@echo
def get_vm_sec_ips(vm_name):
logfilename = "/var/run/cloud/" + vm_name +".ip"
lines = (line.rstrip() for line in open(logfilename))
for line in lines:
try:
[_vmName,_vmIP,_vmID] = line.split(',')
break
except ValueError,v:
[_vmName,_vmIP,_vmID] = line.split(',')
_vmIPS = _vmIP.split(":")[:-1]
return _vmIPS
@echo
def is_secondary_ips_set(vm_name):
logfilename = "/var/run/cloud/" + vm_name +".ip"
if not os.path.exists(logfilename):
return False
return True
@echo
def rewrite_rule_log_for_vm(vm_name, new_domid):
logfilename = "/var/run/cloud/" + vm_name +".log"
if not os.path.exists(logfilename):
return
lines = (line.rstrip() for line in open(logfilename))