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