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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed 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.
"""Unit Tests for network code."""
from nova.network import linux_net
from nova import test
class IptablesManagerTestCase(test.TestCase):
binary_name = linux_net.get_binary_name()
sample_filter = ['#Generated by iptables-save on Fri Feb 18 15:17:05 2011',
'*filter',
':INPUT ACCEPT [2223527:305688874]',
':FORWARD ACCEPT [0:0]',
':OUTPUT ACCEPT [2172501:140856656]',
':iptables-top-rule - [0:0]',
':iptables-bottom-rule - [0:0]',
':%s-FORWARD - [0:0]' % (binary_name),
':%s-INPUT - [0:0]' % (binary_name),
':%s-local - [0:0]' % (binary_name),
':%s-OUTPUT - [0:0]' % (binary_name),
':nova-filter-top - [0:0]',
'[0:0] -A FORWARD -j nova-filter-top',
'[0:0] -A OUTPUT -j nova-filter-top',
'[0:0] -A nova-filter-top -j %s-local' % (binary_name),
'[0:0] -A INPUT -j %s-INPUT' % (binary_name),
'[0:0] -A OUTPUT -j %s-OUTPUT' % (binary_name),
'[0:0] -A FORWARD -j %s-FORWARD' % (binary_name),
'[0:0] -A INPUT -i virbr0 -p udp -m udp --dport 53 '
'-j ACCEPT',
'[0:0] -A INPUT -i virbr0 -p tcp -m tcp --dport 53 '
'-j ACCEPT',
'[0:0] -A INPUT -i virbr0 -p udp -m udp --dport 67 '
'-j ACCEPT',
'[0:0] -A INPUT -i virbr0 -p tcp -m tcp --dport 67 '
'-j ACCEPT',
'[0:0] -A FORWARD -s 192.168.122.0/24 -i virbr0 '
'-j ACCEPT',
'[0:0] -A FORWARD -i virbr0 -o virbr0 -j ACCEPT',
'[0:0] -A FORWARD -o virbr0 -j REJECT --reject-with '
'icmp-port-unreachable',
'[0:0] -A FORWARD -i virbr0 -j REJECT --reject-with '
'icmp-port-unreachable',
'COMMIT',
'# Completed on Fri Feb 18 15:17:05 2011']
sample_nat = ['# Generated by iptables-save on Fri Feb 18 15:17:05 2011',
'*nat',
':PREROUTING ACCEPT [3936:762355]',
':INPUT ACCEPT [2447:225266]',
':OUTPUT ACCEPT [63491:4191863]',
':POSTROUTING ACCEPT [63112:4108641]',
':%s-OUTPUT - [0:0]' % (binary_name),
':%s-snat - [0:0]' % (binary_name),
':%s-PREROUTING - [0:0]' % (binary_name),
':%s-float-snat - [0:0]' % (binary_name),
':%s-POSTROUTING - [0:0]' % (binary_name),
':nova-postrouting-bottom - [0:0]',
'[0:0] -A PREROUTING -j %s-PREROUTING' % (binary_name),
'[0:0] -A OUTPUT -j %s-OUTPUT' % (binary_name),
'[0:0] -A POSTROUTING -j %s-POSTROUTING' % (binary_name),
'[0:0] -A nova-postrouting-bottom '
'-j %s-snat' % (binary_name),
'[0:0] -A %s-snat '
'-j %s-float-snat' % (binary_name, binary_name),
'[0:0] -A POSTROUTING -j nova-postrouting-bottom',
'COMMIT',
'# Completed on Fri Feb 18 15:17:05 2011']
def setUp(self):
super(IptablesManagerTestCase, self).setUp()
self.manager = linux_net.IptablesManager()
def test_filter_rules_are_wrapped(self):
current_lines = self.sample_filter
table = self.manager.ipv4['filter']
table.add_rule('FORWARD', '-s 1.2.3.4/5 -j DROP')
new_lines = self.manager._modify_rules(current_lines, table, 'filter')
self.assertTrue('[0:0] -A %s-FORWARD '
'-s 1.2.3.4/5 -j DROP' % self.binary_name in new_lines)
table.remove_rule('FORWARD', '-s 1.2.3.4/5 -j DROP')
new_lines = self.manager._modify_rules(current_lines, table, 'filter')
self.assertTrue('[0:0] -A %s-FORWARD '
'-s 1.2.3.4/5 -j DROP' % self.binary_name
not in new_lines)
def test_remove_rules_regex(self):
current_lines = self.sample_nat
table = self.manager.ipv4['nat']
table.add_rule('float-snat', '-s 10.0.0.1 -j SNAT --to 10.10.10.10'
' -d 10.0.0.1')
table.add_rule('float-snat', '-s 10.0.0.1 -j SNAT --to 10.10.10.10'
' -o eth0')
table.add_rule('PREROUTING', '-d 10.10.10.10 -j DNAT --to 10.0.0.1')
table.add_rule('OUTPUT', '-d 10.10.10.10 -j DNAT --to 10.0.0.1')
table.add_rule('float-snat', '-s 10.0.0.10 -j SNAT --to 10.10.10.11'
' -d 10.0.0.10')
table.add_rule('float-snat', '-s 10.0.0.10 -j SNAT --to 10.10.10.11'
' -o eth0')
table.add_rule('PREROUTING', '-d 10.10.10.11 -j DNAT --to 10.0.0.10')
table.add_rule('OUTPUT', '-d 10.10.10.11 -j DNAT --to 10.0.0.10')
new_lines = self.manager._modify_rules(current_lines, table, 'nat')
self.assertEqual(len(new_lines) - len(current_lines), 8)
regex = '.*\s+%s(/32|\s+|$)'
num_removed = table.remove_rules_regex(regex % '10.10.10.10')
self.assertEqual(num_removed, 4)
new_lines = self.manager._modify_rules(current_lines, table, 'nat')
self.assertEqual(len(new_lines) - len(current_lines), 4)
num_removed = table.remove_rules_regex(regex % '10.10.10.11')
self.assertEqual(num_removed, 4)
new_lines = self.manager._modify_rules(current_lines, table, 'nat')
self.assertEqual(new_lines, current_lines)
def test_nat_rules(self):
current_lines = self.sample_nat
new_lines = self.manager._modify_rules(current_lines,
self.manager.ipv4['nat'],
'nat')
for line in [':%s-OUTPUT - [0:0]' % (self.binary_name),
':%s-float-snat - [0:0]' % (self.binary_name),
':%s-snat - [0:0]' % (self.binary_name),
':%s-PREROUTING - [0:0]' % (self.binary_name),
':%s-POSTROUTING - [0:0]' % (self.binary_name)]:
self.assertTrue(line in new_lines, "One of our chains went"
" missing.")
seen_lines = set()
for line in new_lines:
line = line.strip()
self.assertTrue(line not in seen_lines,
"Duplicate line: %s" % line)
seen_lines.add(line)
last_postrouting_line = ''
for line in new_lines:
if line.startswith('[0:0] -A POSTROUTING'):
last_postrouting_line = line
self.assertTrue('-j nova-postrouting-bottom' in last_postrouting_line,
"Last POSTROUTING rule does not jump to "
"nova-postouting-bottom: %s" % last_postrouting_line)
for chain in ['POSTROUTING', 'PREROUTING', 'OUTPUT']:
self.assertTrue('[0:0] -A %s -j %s-%s' %
(chain, self.binary_name, chain) in new_lines,
"Built-in chain %s not wrapped" % (chain,))
def test_filter_rules(self):
current_lines = self.sample_filter
new_lines = self.manager._modify_rules(current_lines,
self.manager.ipv4['filter'],
'nat')
for line in [':%s-FORWARD - [0:0]' % (self.binary_name),
':%s-INPUT - [0:0]' % (self.binary_name),
':%s-local - [0:0]' % (self.binary_name),
':%s-OUTPUT - [0:0]' % (self.binary_name)]:
self.assertTrue(line in new_lines, "One of our chains went"
" missing.")
seen_lines = set()
for line in new_lines:
line = line.strip()
self.assertTrue(line not in seen_lines,
"Duplicate line: %s" % line)
seen_lines.add(line)
for chain in ['FORWARD', 'OUTPUT']:
for line in new_lines:
if line.startswith('[0:0] -A %s' % chain):
self.assertTrue('-j nova-filter-top' in line,
"First %s rule does not "
"jump to nova-filter-top" % chain)
break
self.assertTrue('[0:0] -A nova-filter-top '
'-j %s-local' % self.binary_name in new_lines,
"nova-filter-top does not jump to wrapped local chain")
for chain in ['INPUT', 'OUTPUT', 'FORWARD']:
self.assertTrue('[0:0] -A %s -j %s-%s' %
(chain, self.binary_name, chain) in new_lines,
"Built-in chain %s not wrapped" % (chain,))
def test_missing_table(self):
current_lines = []
new_lines = self.manager._modify_rules(current_lines,
self.manager.ipv4['filter'],
'filter')
for line in ['*filter',
'COMMIT']:
self.assertTrue(line in new_lines, "One of iptables key lines"
"went missing.")
self.assertTrue(len(new_lines) > 4, "No iptables rules added")
self.assertTrue("#Generated by nova" == new_lines[0] and
"*filter" == new_lines[1] and
"COMMIT" == new_lines[-2] and
"#Completed by nova" == new_lines[-1],
"iptables rules not generated in the correct order")
def test_iptables_top_order(self):
# Test iptables_top_regex
current_lines = list(self.sample_filter)
current_lines[12:12] = ['[0:0] -A FORWARD -j iptables-top-rule']
self.flags(iptables_top_regex='-j iptables-top-rule')
new_lines = self.manager._modify_rules(current_lines,
self.manager.ipv4['filter'],
'filter')
self.assertEqual(current_lines, new_lines)
def test_iptables_bottom_order(self):
# Test iptables_bottom_regex
current_lines = list(self.sample_filter)
current_lines[26:26] = ['[0:0] -A FORWARD -j iptables-bottom-rule']
self.flags(iptables_bottom_regex='-j iptables-bottom-rule')
new_lines = self.manager._modify_rules(current_lines,
self.manager.ipv4['filter'],
'filter')
self.assertEqual(current_lines, new_lines)
def test_iptables_preserve_order(self):
# Test both iptables_top_regex and iptables_bottom_regex
current_lines = list(self.sample_filter)
current_lines[12:12] = ['[0:0] -A FORWARD -j iptables-top-rule']
current_lines[27:27] = ['[0:0] -A FORWARD -j iptables-bottom-rule']
self.flags(iptables_top_regex='-j iptables-top-rule')
self.flags(iptables_bottom_regex='-j iptables-bottom-rule')
new_lines = self.manager._modify_rules(current_lines,
self.manager.ipv4['filter'],
'filter')
self.assertEqual(current_lines, new_lines)
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