mirror of
https://github.com/sshuttle/sshuttle.git
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bc24ed359a
First, check if TTL indicates we should ignore packet (instead of checking in multiple rules later). Also, nft method didn't do this at all. Now, nft matches the behavior of nat. Second, forward DNS traffic (we may need to intercept traffic to localhost if a DNS server is running on localhost). Third, ignore any local traffic packets. (Previously, we ignored local traffic except DNS and then had the DNS rules). The nft method didn't do this previously at all. It now matches the behavior of nat. Lastly, list the subnets to redirect and/or exclude. This step is left unchanged. Excluding the local port that we are listening on is redundant with the third step, but should cause no harm. In summary, this ordering simplifies the rules in nat and eliminates differences that previously existed between nat and nft.
167 lines
5.6 KiB
Python
167 lines
5.6 KiB
Python
import socket
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from socket import AF_INET, AF_INET6
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import struct
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import pytest
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from mock import Mock, patch, call
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from sshuttle.helpers import Fatal
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from sshuttle.methods import get_method
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def test_get_supported_features():
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method = get_method('nat')
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features = method.get_supported_features()
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assert not features.ipv6
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assert not features.udp
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assert features.dns
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def test_get_tcp_dstip():
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sock = Mock()
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sock.getsockopt.return_value = struct.pack(
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'!HHBBBB', socket.ntohs(AF_INET), 1024, 127, 0, 0, 1)
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method = get_method('nat')
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assert method.get_tcp_dstip(sock) == ('127.0.0.1', 1024)
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assert sock.mock_calls == [call.getsockopt(0, 80, 16)]
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def test_recv_udp():
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sock = Mock()
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sock.recvfrom.return_value = "11111", "127.0.0.1"
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method = get_method('nat')
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result = method.recv_udp(sock, 1024)
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assert sock.mock_calls == [call.recvfrom(1024)]
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assert result == ("127.0.0.1", None, "11111")
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def test_send_udp():
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sock = Mock()
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method = get_method('nat')
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method.send_udp(sock, None, "127.0.0.1", "22222")
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assert sock.mock_calls == [call.sendto("22222", "127.0.0.1")]
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def test_setup_tcp_listener():
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listener = Mock()
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method = get_method('nat')
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method.setup_tcp_listener(listener)
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assert listener.mock_calls == []
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def test_setup_udp_listener():
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listener = Mock()
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method = get_method('nat')
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method.setup_udp_listener(listener)
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assert listener.mock_calls == []
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def test_assert_features():
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method = get_method('nat')
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features = method.get_supported_features()
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method.assert_features(features)
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features.udp = True
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with pytest.raises(Fatal):
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method.assert_features(features)
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features.ipv6 = True
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with pytest.raises(Fatal):
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method.assert_features(features)
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def test_firewall_command():
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method = get_method('nat')
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assert not method.firewall_command("somthing")
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@patch('sshuttle.methods.nat.ipt')
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@patch('sshuttle.methods.nat.ipt_ttl')
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@patch('sshuttle.methods.nat.ipt_chain_exists')
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def test_setup_firewall(mock_ipt_chain_exists, mock_ipt_ttl, mock_ipt):
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mock_ipt_chain_exists.return_value = True
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method = get_method('nat')
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assert method.name == 'nat'
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with pytest.raises(Exception) as excinfo:
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method.setup_firewall(
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1024, 1026,
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[(AF_INET6, u'2404:6800:4004:80c::33')],
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AF_INET6,
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[(AF_INET6, 64, False, u'2404:6800:4004:80c::', 0, 0),
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(AF_INET6, 128, True, u'2404:6800:4004:80c::101f', 80, 80)],
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True,
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None)
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assert str(excinfo.value) \
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== 'Address family "AF_INET6" unsupported by nat method_name'
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assert mock_ipt_chain_exists.mock_calls == []
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assert mock_ipt_ttl.mock_calls == []
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assert mock_ipt.mock_calls == []
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with pytest.raises(Exception) as excinfo:
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method.setup_firewall(
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1025, 1027,
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[(AF_INET, u'1.2.3.33')],
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AF_INET,
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[(AF_INET, 24, False, u'1.2.3.0', 8000, 9000),
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(AF_INET, 32, True, u'1.2.3.66', 8080, 8080)],
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True,
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None)
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assert str(excinfo.value) == 'UDP not supported by nat method_name'
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assert mock_ipt_chain_exists.mock_calls == []
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assert mock_ipt_ttl.mock_calls == []
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assert mock_ipt.mock_calls == []
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method.setup_firewall(
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1025, 1027,
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[(AF_INET, u'1.2.3.33')],
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AF_INET,
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[(AF_INET, 24, False, u'1.2.3.0', 8000, 9000),
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(AF_INET, 32, True, u'1.2.3.66', 8080, 8080)],
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False,
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None)
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assert mock_ipt_chain_exists.mock_calls == [
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call(AF_INET, 'nat', 'sshuttle-1025')
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]
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assert mock_ipt_ttl.mock_calls == [
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call(AF_INET, 'nat', '-A', 'sshuttle-1025', '-j', 'RETURN',
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'-m', 'ttl', '--ttl', '63')
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]
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assert mock_ipt.mock_calls == [
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call(AF_INET, 'nat', '-D', 'OUTPUT', '-j', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-D', 'PREROUTING', '-j', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-F', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-X', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-N', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-F', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-I', 'OUTPUT', '1', '-j', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-I', 'PREROUTING', '1', '-j', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-A', 'sshuttle-1025', '-j', 'REDIRECT',
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'--dest', u'1.2.3.33/32', '-p', 'udp',
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'--dport', '53', '--to-ports', '1027'),
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call(AF_INET, 'nat', '-A', 'sshuttle-1025', '-j', 'RETURN',
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'-m', 'addrtype', '--dst-type', 'LOCAL'),
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call(AF_INET, 'nat', '-A', 'sshuttle-1025', '-j', 'RETURN',
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'--dest', u'1.2.3.66/32', '-p', 'tcp', '--dport', '8080:8080'),
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call(AF_INET, 'nat', '-A', 'sshuttle-1025', '-j', 'REDIRECT',
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'--dest', u'1.2.3.0/24', '-p', 'tcp', '--dport', '8000:9000',
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'--to-ports', '1025')
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]
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mock_ipt_chain_exists.reset_mock()
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mock_ipt_ttl.reset_mock()
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mock_ipt.reset_mock()
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method.restore_firewall(1025, AF_INET, False, None)
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assert mock_ipt_chain_exists.mock_calls == [
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call(AF_INET, 'nat', 'sshuttle-1025')
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]
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assert mock_ipt_ttl.mock_calls == []
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assert mock_ipt.mock_calls == [
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call(AF_INET, 'nat', '-D', 'OUTPUT', '-j', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-D', 'PREROUTING', '-j', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-F', 'sshuttle-1025'),
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call(AF_INET, 'nat', '-X', 'sshuttle-1025')
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]
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mock_ipt_chain_exists.reset_mock()
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mock_ipt_ttl.reset_mock()
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mock_ipt.reset_mock()
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