mirror of
https://github.com/sshuttle/sshuttle.git
synced 2025-01-07 14:39:45 +01:00
167a57e739
In instances where a cluster pod in a local VM needs to access a server that is sshuttle'd from the host, since the packets arriving at the host already made a hop, their TTL is 63 and so get ignored by sshuttle. Allowing an override of the firewall TTL rule allows the packets to go through.
180 lines
6.0 KiB
Python
180 lines
6.0 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 unittest.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.family = AF_INET
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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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sock = Mock()
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sock.family = AF_INET6
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sock.getsockopt.return_value = struct.pack(
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'!HH4xBBBBBBBBBBBBBBBB', socket.ntohs(AF_INET6),
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1024, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1)
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method = get_method('nft')
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assert method.get_tcp_dstip(sock) == ('::1', 1024)
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assert sock.mock_calls == [call.getsockopt(41, 80, 64)]
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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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63)
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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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63)
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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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63)
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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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