diff options
| -rw-r--r-- | nova/network/linux_net.py | 17 | ||||
| -rw-r--r-- | nova/tests/test_virt.py | 55 | ||||
| -rw-r--r-- | nova/virt/libvirt_conn.py | 215 |
3 files changed, 145 insertions, 142 deletions
diff --git a/nova/network/linux_net.py b/nova/network/linux_net.py index 3d267d941..c11d34922 100644 --- a/nova/network/linux_net.py +++ b/nova/network/linux_net.py @@ -100,13 +100,23 @@ class IptablesTable(object): def remove_chain(self, name): self.chains.remove(name) + self.rules = filter(lambda r: r.chain != name, self.rules) def add_rule(self, chain, rule, wrap=True): if wrap and chain not in self.chains: raise ValueError(_("Unknown chain: %r") % chain) + if '$' in rule: + rule = ' '.join(map(self._wrap_target_chain, rule.split(' '))) + + print 'Adding rule: %r' % rule self.rules.append(IptablesRule(chain, rule, wrap)) + def _wrap_target_chain(self, s): + if s.startswith('$'): + return '%s-%s' % (binary_name, s[1:]) + return s + def remove_rule(self, chain, rule): self.rules.remove(IptablesRule(chain, rule)) @@ -122,8 +132,7 @@ class IptablesManager(object): self.ipv4 = { 'filter': IptablesTable(), 'nat': IptablesTable() } - self.ipv6 = { 'filter': IptablesTable(), - 'nat': IptablesTable() } + self.ipv6 = { 'filter': IptablesTable() } self.ipv4['nat'].add_chain('SNATTING') self.ipv4['nat'].add_rule('POSTROUTING', @@ -135,6 +144,10 @@ class IptablesManager(object): '-j %s-local' % (binary_name,), wrap=False) + self.ipv4['filter'].add_rule('OUTPUT', + '-j %s-local' % (binary_name,), + wrap=False) + # Wrap the builtin chains builtin_chains = {'filter': ['INPUT', 'OUTPUT', 'FORWARD'], 'nat': ['PREROUTING', 'INPUT', diff --git a/nova/tests/test_virt.py b/nova/tests/test_virt.py index 6e5a0114b..a88e01818 100644 --- a/nova/tests/test_virt.py +++ b/nova/tests/test_virt.py @@ -14,6 +14,7 @@ # License for the specific language governing permissions and limitations # under the License. +import re from xml.etree.ElementTree import fromstring as xml_to_tree from xml.dom.minidom import parseString as xml_to_dom @@ -233,16 +234,22 @@ class IptablesFirewallTestCase(test.TestCase): self.manager.delete_user(self.user) super(IptablesFirewallTestCase, self).tearDown() - in_rules = [ + in_nat_rules = [ + '# Generated by iptables-save v1.4.10 on Sat Feb 19 00:03:19 2011', + '*nat', + ':PREROUTING ACCEPT [1170:189210]', + ':INPUT ACCEPT [844:71028]', + ':OUTPUT ACCEPT [5149:405186]', + ':POSTROUTING ACCEPT [5063:386098]' + ] + + in_filter_rules = [ '# Generated by iptables-save v1.4.4 on Mon Dec 6 11:54:13 2010', '*filter', ':INPUT ACCEPT [969615:281627771]', ':FORWARD ACCEPT [0:0]', ':OUTPUT ACCEPT [915599:63811649]', ':nova-block-ipv4 - [0:0]', - '-A INPUT -i virbr0 -p udp -m udp --dport 53 -j ACCEPT ', - '-A INPUT -i virbr0 -p tcp -m tcp --dport 53 -j ACCEPT ', - '-A INPUT -i virbr0 -p udp -m udp --dport 67 -j ACCEPT ', '-A INPUT -i virbr0 -p tcp -m tcp --dport 67 -j ACCEPT ', '-A FORWARD -d 192.168.122.0/24 -o virbr0 -m state --state RELATED' ',ESTABLISHED -j ACCEPT ', @@ -254,7 +261,7 @@ class IptablesFirewallTestCase(test.TestCase): '# Completed on Mon Dec 6 11:54:13 2010', ] - in6_rules = [ + in6_filter_rules = [ '# Generated by ip6tables-save v1.4.4 on Tue Jan 18 23:47:56 2011', '*filter', ':INPUT ACCEPT [349155:75810423]', @@ -314,23 +321,31 @@ class IptablesFirewallTestCase(test.TestCase): instance_ref = db.instance_get(admin_ctxt, instance_ref['id']) # self.fw.add_instance(instance_ref) - def fake_iptables_execute(cmd, process_input=None): + def fake_iptables_execute(cmd, process_input=None, attempts=5): if cmd == 'sudo ip6tables-save -t filter': - return '\n'.join(self.in6_rules), None + return '\n'.join(self.in6_filter_rules), None if cmd == 'sudo iptables-save -t filter': - return '\n'.join(self.in_rules), None + return '\n'.join(self.in_filter_rules), None + if cmd == 'sudo iptables-save -t nat': + return '\n'.join(self.in_nat_rules), None if cmd == 'sudo iptables-restore': - self.out_rules = process_input.split('\n') + lines = process_input.split('\n') + if '*filter' in lines: + self.out_rules = lines return '', '' if cmd == 'sudo ip6tables-restore': - self.out6_rules = process_input.split('\n') + lines = process_input.split('\n') + if '*filter' in lines: + self.out6_rules = lines return '', '' - self.fw.execute = fake_iptables_execute + + from nova.network import linux_net + linux_net.iptables_manager.execute = fake_iptables_execute self.fw.prepare_instance_filter(instance_ref) self.fw.apply_instance_filter(instance_ref) - in_rules = filter(lambda l: not l.startswith('#'), self.in_rules) + in_rules = filter(lambda l: not l.startswith('#'), self.in_filter_rules) for rule in in_rules: if not 'nova' in rule: self.assertTrue(rule in self.out_rules, @@ -338,6 +353,7 @@ class IptablesFirewallTestCase(test.TestCase): instance_chain = None for rule in self.out_rules: + print rule # This is pretty crude, but it'll do for now if '-d 10.11.12.13 -j' in rule: instance_chain = rule.split(' ')[-1] @@ -353,17 +369,18 @@ class IptablesFirewallTestCase(test.TestCase): self.assertTrue(security_group_chain, "The security group chain wasn't added") - self.assertTrue('-A %s -p icmp -s 192.168.11.0/24 -j ACCEPT' % \ - security_group_chain in self.out_rules, + regex = re.compile('-A .* -p icmp -s 192.168.11.0/24 -j ACCEPT') + self.assertTrue(len(filter(regex.match, self.out_rules)) > 0, "ICMP acceptance rule wasn't added") - self.assertTrue('-A %s -p icmp -s 192.168.11.0/24 -m icmp --icmp-type ' - '8 -j ACCEPT' % security_group_chain in self.out_rules, + regex = re.compile('-A .* -p icmp -s 192.168.11.0/24 -m icmp ' + '--icmp-type 8 -j ACCEPT') + self.assertTrue(len(filter(regex.match, self.out_rules)) > 0, "ICMP Echo Request acceptance rule wasn't added") - self.assertTrue('-A %s -p tcp -s 192.168.10.0/24 -m multiport ' - '--dports 80:81 -j ACCEPT' % security_group_chain \ - in self.out_rules, + regex = re.compile('-A .* -p tcp -s 192.168.10.0/24 -m multiport ' + '--dports 80:81 -j ACCEPT') + self.assertTrue(len(filter(regex.match, self.out_rules)) > 0, "TCP port 80/81 acceptance rule wasn't added") diff --git a/nova/virt/libvirt_conn.py b/nova/virt/libvirt_conn.py index 11b3acbf6..976ccaca5 100644 --- a/nova/virt/libvirt_conn.py +++ b/nova/virt/libvirt_conn.py @@ -57,7 +57,6 @@ from nova import exception from nova import flags from nova import log as logging from nova import utils -#from nova.api import context from nova.auth import manager from nova.compute import instance_types from nova.compute import power_state @@ -1207,10 +1206,14 @@ class NWFilterFirewall(FirewallDriver): class IptablesFirewallDriver(FirewallDriver): def __init__(self, execute=None, **kwargs): - self.execute = execute or utils.execute + from nova.network import linux_net + self.iptables = linux_net.iptables_manager self.instances = {} self.nwfilter = NWFilterFirewall(kwargs['get_connection']) + self.iptables.ipv4['filter'].add_chain('sg-fallback') + self.iptables.ipv4['filter'].add_rule('sg-fallback', '-j DROP') + def setup_basic_filtering(self, instance): """Use NWFilter from libvirt for this.""" return self.nwfilter.setup_basic_filtering(instance) @@ -1226,124 +1229,92 @@ class IptablesFirewallDriver(FirewallDriver): LOG.info(_('Attempted to unfilter instance %s which is not ' 'filtered'), instance['id']) - def add_instance(self, instance): + def prepare_instance_filter(self, instance): self.instances[instance['id']] = instance + chain_name = self._instance_chain_name(instance) + + self.iptables.ipv4['filter'].add_chain(chain_name) + ipv4_address = self._ip_for_instance(instance) + self.iptables.ipv4['filter'].add_rule('local', + '-d %s -j $%s' % + (ipv4_address, chain_name)) + + if FLAGS.use_ipv6: + self.iptables.ipv6['filter'].add_chain(chain_name) + ipv6_address = self._ip_for_instance_v6(instance) + self.iptables.ipv4['filter'].add_rule('local', + '-d %s -j $%s' % + (ipv6_address, + chain_name)) + + ipv4_rules, ipv6_rules = self.instance_rules(instance) + + for rule in ipv4_rules: + self.iptables.ipv4['filter'].add_rule(chain_name, rule) + + if FLAGS.use_ipv6: + for rule in ipv6_rules: + self.iptables.ipv6['filter'].add_rule(chain_name, rule) + + self.iptables.apply() + def unfilter_instance(self, instance): - self.remove_instance(instance) - self.apply_ruleset() + chain_name = self._instance_chain_name(instance) - def prepare_instance_filter(self, instance): - self.add_instance(instance) - self.apply_ruleset() + self.iptables.ipv4['filter'].remove_chain(chain_name) + if FLAGS.use_ipv6: + self.iptables.ipv6['filter'].remove_chain(chain_name) - def apply_ruleset(self): - current_filter, _ = self.execute('sudo iptables-save -t filter', - attempts=5) - current_lines = current_filter.split('\n') - new_filter = self.modify_rules(current_lines, 4) - self.execute('sudo iptables-restore', - process_input='\n'.join(new_filter), - attempts=5) - if(FLAGS.use_ipv6): - current_filter, _ = self.execute('sudo ip6tables-save ' - '-t filter', - attempts=5) - current_lines = current_filter.split('\n') - new_filter = self.modify_rules(current_lines, 6) - self.execute('sudo ip6tables-restore', - process_input='\n'.join(new_filter), - attempts=5) - - def modify_rules(self, current_lines, ip_version=4): + self.iptables.apply() + + + def instance_rules(self, instance): ctxt = context.get_admin_context() - # Remove any trace of nova rules. - new_filter = filter(lambda l: 'nova-' not in l, current_lines) - - seen_chains = False - for rules_index in range(len(new_filter)): - if not seen_chains: - if new_filter[rules_index].startswith(':'): - seen_chains = True - elif seen_chains == 1: - if not new_filter[rules_index].startswith(':'): - break - our_chains = [':nova-fallback - [0:0]'] - our_rules = ['-A nova-fallback -j DROP'] - - our_chains += [':nova-local - [0:0]'] - our_rules += ['-A FORWARD -j nova-local'] - our_rules += ['-A OUTPUT -j nova-local'] - - security_groups = {} - # Add our chains - # First, we add instance chains and rules - for instance_id in self.instances: - instance = self.instances[instance_id] - chain_name = self._instance_chain_name(instance) - if(ip_version == 4): - ip_address = self._ip_for_instance(instance) - elif(ip_version == 6): - ip_address = self._ip_for_instance_v6(instance) - - our_chains += [':%s - [0:0]' % chain_name] - - # Jump to the per-instance chain - our_rules += ['-A nova-local -d %s -j %s' % (ip_address, - chain_name)] - - # Always drop invalid packets - our_rules += ['-A %s -m state --state ' - 'INVALID -j DROP' % (chain_name,)] - - # Allow established connections - our_rules += ['-A %s -m state --state ' - 'ESTABLISHED,RELATED -j ACCEPT' % (chain_name,)] - - # Jump to each security group chain in turn - for security_group in \ - db.security_group_get_by_instance(ctxt, - instance['id']): - security_groups[security_group['id']] = security_group - - sg_chain_name = self._security_group_chain_name( - security_group['id']) + ipv4_rules = [] + ipv6_rules = [] - our_rules += ['-A %s -j %s' % (chain_name, sg_chain_name)] - - if(ip_version == 4): - # Allow DHCP responses - dhcp_server = self._dhcp_server_for_instance(instance) - our_rules += ['-A %s -s %s -p udp --sport 67 --dport 68 ' - '-j ACCEPT ' % (chain_name, dhcp_server)] - #Allow project network traffic - if (FLAGS.allow_project_net_traffic): - cidr = self._project_cidr_for_instance(instance) - our_rules += ['-A %s -s %s -j ACCEPT' % (chain_name, cidr)] - elif(ip_version == 6): - # Allow RA responses - ra_server = self._ra_server_for_instance(instance) - if ra_server: - our_rules += ['-A %s -s %s -p icmpv6 -j ACCEPT' % - (chain_name, ra_server + "/128")] - #Allow project network traffic - if (FLAGS.allow_project_net_traffic): - cidrv6 = self._project_cidrv6_for_instance(instance) - our_rules += ['-A %s -s %s -j ACCEPT' % - (chain_name, cidrv6)] - - # If nothing matches, jump to the fallback chain - our_rules += ['-A %s -j nova-fallback' % (chain_name,)] + # Always drop invalid packets + ipv4_rules += ['-m state --state ' 'INVALID -j DROP'] + ipv6_rules += ['-m state --state ' 'INVALID -j DROP'] - # then, security group chains and rules - for security_group_id in security_groups: - chain_name = self._security_group_chain_name(security_group_id) - our_chains += [':%s - [0:0]' % chain_name] + # Allow established connections + ipv4_rules += ['-m state --state ESTABLISHED,RELATED -j ACCEPT'] + ipv6_rules += ['-m state --state ESTABLISHED,RELATED -j ACCEPT'] + + dhcp_server = self._dhcp_server_for_instance(instance) + ipv4_rules += ['-s %s -p udp --sport 67 --dport 68 ' + '-j ACCEPT' % (dhcp_server,)] + + #Allow project network traffic + if FLAGS.allow_project_net_traffic: + cidr = self._project_cidr_for_instance(instance) + ipv4_rules += ['-s %s -j ACCEPT' % (cidr,)] + + # We wrap these in FLAGS.use_ipv6 because they might cause + # a DB lookup. The other ones are just list operations, so + # they're not worth the clutter. + if FLAGS.use_ipv6: + # Allow RA responses + ra_server = self._ra_server_for_instance(instance) + if ra_server: + ipv6_rules += ['-s %s/128 -p icmpv6 -j ACCEPT' % (ra_server,)] - rules = \ - db.security_group_rule_get_by_security_group(ctxt, - security_group_id) + #Allow project network traffic + if FLAGS.allow_project_net_traffic: + cidrv6 = self._project_cidrv6_for_instance(instance) + ipv6_rules += ['-s %s -j ACCEPT' % (cidrv6,)] + + + security_groups = db.security_group_get_by_instance(ctxt, + instance['id']) + + + # then, security group chains and rules + for security_group in security_groups: + rules = db.security_group_rule_get_by_security_group(ctxt, + security_group['id']) for rule in rules: logging.info('%r', rule) @@ -1354,14 +1325,16 @@ class IptablesFirewallDriver(FirewallDriver): continue version = _get_ip_version(rule.cidr) - if version != ip_version: - continue + if version == 4: + rules = ipv4_rules + else: + rules = ipv6_rules protocol = rule.protocol if version == 6 and rule.protocol == 'icmp': protocol = 'icmpv6' - args = ['-A', chain_name, '-p', protocol, '-s', rule.cidr] + args = ['-p', protocol, '-s', rule.cidr] if rule.protocol in ['udp', 'tcp']: if rule.from_port == rule.to_port: @@ -1382,20 +1355,20 @@ class IptablesFirewallDriver(FirewallDriver): icmp_type_arg += '/%s' % icmp_code if icmp_type_arg: - if(ip_version == 4): + if version == 4: args += ['-m', 'icmp', '--icmp-type', icmp_type_arg] - elif(ip_version == 6): + elif version == 6: args += ['-m', 'icmp6', '--icmpv6-type', icmp_type_arg] args += ['-j ACCEPT'] - our_rules += [' '.join(args)] + rules += [' '.join(args)] + + ipv4_rules += ['-j $fallback'] + ipv6_rules += ['-j $fallback'] - new_filter[rules_index:rules_index] = our_rules - new_filter[rules_index:rules_index] = our_chains - logging.info('new_filter: %s', '\n'.join(new_filter)) - return new_filter + return ipv4_rules, ipv6_rules def refresh_security_group_members(self, security_group): pass @@ -1407,7 +1380,7 @@ class IptablesFirewallDriver(FirewallDriver): return 'nova-sg-%s' % (security_group_id,) def _instance_chain_name(self, instance): - return 'nova-inst-%s' % (instance['id'],) + return 'inst-%s' % (instance['id'],) def _ip_for_instance(self, instance): return db.instance_get_fixed_address(context.get_admin_context(), |