#!/usr/bin/python2 # -*- coding: utf-8 -*- # # The Qubes OS Project, http://www.qubes-os.org # # Copyright (C) 2010 Joanna Rutkowska # Copyright (C) 2013 Marek Marczykowski # # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # # 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, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. # # from datetime import datetime from qubes.qubes import QubesNetVm,register_qubes_vm_class,vmm,dry_run from qubes.qubes import QubesVmCollection,QubesException yum_proxy_ip = '10.137.255.254' yum_proxy_port = '8082' class QubesProxyVm(QubesNetVm): """ A class that represents a ProxyVM, ex FirewallVM. A child of QubesNetVM. """ def get_attrs_config(self): attrs_config = super(QubesProxyVm, self).get_attrs_config() attrs_config['uses_default_netvm']['func'] = lambda x: False # Save netvm prop again attrs_config['netvm']['save'] = \ lambda: str(self.netvm.qid) if self.netvm is not None else "none" return attrs_config def __init__(self, **kwargs): super(QubesProxyVm, self).__init__(**kwargs) self.rules_applied = None @property def type(self): return "ProxyVM" def is_proxyvm(self): return True def _set_netvm(self, new_netvm): old_netvm = self.netvm super(QubesProxyVm, self)._set_netvm(new_netvm) if self.netvm is not None: self.netvm.add_external_ip_permission(self.get_xid()) self.write_netvm_domid_entry() if old_netvm is not None: old_netvm.remove_external_ip_permission(self.get_xid()) def post_vm_net_attach(self, vm): """ Called after some VM net-attached to this ProxyVm """ self.write_iptables_xenstore_entry() def post_vm_net_detach(self, vm): """ Called after some VM net-detached from this ProxyVm """ self.write_iptables_xenstore_entry() def start(self, **kwargs): if dry_run: return retcode = super(QubesProxyVm, self).start(**kwargs) if self.netvm is not None: self.netvm.add_external_ip_permission(self.get_xid()) self.write_netvm_domid_entry() return retcode def force_shutdown(self, **kwargs): if dry_run: return if self.netvm is not None: self.netvm.remove_external_ip_permission(kwargs['xid'] if 'xid' in kwargs else self.get_xid()) super(QubesProxyVm, self).force_shutdown(**kwargs) def create_xenstore_entries(self, xid = None): if dry_run: return if xid is None: xid = self.xid super(QubesProxyVm, self).create_xenstore_entries(xid) self.qdb.write("/qubes-iptables-error", '') self.write_iptables_xenstore_entry() def write_netvm_domid_entry(self, xid = -1): if not self.is_running(): return if xid < 0: xid = self.get_xid() if self.netvm is None: self.qdb.write("/qubes-netvm-domid", '') else: self.qdb.write("/qubes-netvm-domid", "{0}".format(self.netvm.get_xid())) def write_iptables_xenstore_entry(self): self.qdb.rm("/qubes-iptables-domainrules/") iptables = "# Generated by Qubes Core on {0}\n".format(datetime.now().ctime()) iptables += "*filter\n" iptables += ":INPUT DROP [0:0]\n" iptables += ":FORWARD DROP [0:0]\n" iptables += ":OUTPUT ACCEPT [0:0]\n" # Strict INPUT rules iptables += "-A INPUT -i vif+ -p udp -m udp --dport 68 -j DROP\n" iptables += "-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED " \ "-j ACCEPT\n" iptables += "-A INPUT -p icmp -j ACCEPT\n" iptables += "-A INPUT -i lo -j ACCEPT\n" iptables += "-A INPUT -j REJECT --reject-with icmp-host-prohibited\n" iptables += "-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED " \ "-j ACCEPT\n" # Allow dom0 networking iptables += "-A FORWARD -i vif0.0 -j ACCEPT\n" # Deny inter-VMs networking iptables += "-A FORWARD -i vif+ -o vif+ -j DROP\n" iptables += "COMMIT\n" self.qdb.write("/qubes-iptables-header", iptables) vms = [vm for vm in self.connected_vms.values()] for vm in vms: iptables="*filter\n" conf = vm.get_firewall_conf() xid = vm.get_xid() if xid < 0: # VM not active ATM continue ip = vm.ip if ip is None: continue # Anti-spoof rules are added by vif-script (vif-route-qubes), here we trust IP address accept_action = "ACCEPT" reject_action = "REJECT --reject-with icmp-host-prohibited" if conf["allow"]: default_action = accept_action rules_action = reject_action else: default_action = reject_action rules_action = accept_action for rule in conf["rules"]: iptables += "-A FORWARD -s {0} -d {1}".format(ip, rule["address"]) if rule["netmask"] != 32: iptables += "/{0}".format(rule["netmask"]) if rule["proto"] is not None and rule["proto"] != "any": iptables += " -p {0}".format(rule["proto"]) if rule["portBegin"] is not None and rule["portBegin"] > 0: iptables += " --dport {0}".format(rule["portBegin"]) if rule["portEnd"] is not None and rule["portEnd"] > rule["portBegin"]: iptables += ":{0}".format(rule["portEnd"]) iptables += " -j {0}\n".format(rules_action) if conf["allowDns"] and self.netvm is not None: # PREROUTING does DNAT to NetVM DNSes, so we need self.netvm. # properties iptables += "-A FORWARD -s {0} -p udp -d {1} --dport 53 -j " \ "ACCEPT\n".format(ip,self.netvm.gateway) iptables += "-A FORWARD -s {0} -p udp -d {1} --dport 53 -j " \ "ACCEPT\n".format(ip,self.netvm.secondary_dns) iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport 53 -j " \ "ACCEPT\n".format(ip,self.netvm.gateway) iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport 53 -j " \ "ACCEPT\n".format(ip,self.netvm.secondary_dns) if conf["allowIcmp"]: iptables += "-A FORWARD -s {0} -p icmp -j ACCEPT\n".format(ip) if conf["allowYumProxy"]: iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport {2} -j ACCEPT\n".format(ip, yum_proxy_ip, yum_proxy_port) else: iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport {2} -j DROP\n".format(ip, yum_proxy_ip, yum_proxy_port) iptables += "-A FORWARD -s {0} -j {1}\n".format(ip, default_action) iptables += "COMMIT\n" self.qdb.write("/qubes-iptables-domainrules/"+str(xid), iptables) # no need for ending -A FORWARD -j DROP, cause default action is DROP self.write_netvm_domid_entry() self.rules_applied = None self.qdb.write("/qubes-iptables", 'reload') register_qubes_vm_class(QubesProxyVm)