mirror of
https://github.com/retspen/webvirtcloud
synced 2026-11-08 19:26:48 +00:00
21f0777e76
Taking or reverting an internal snapshot redefined a pflash VM with a rom loader around the operation. libvirt 10.10 rejects that definition, so the request ended in a 500; where it was accepted, the snapshot recorded the fake loader, and a failure between rewrite and restore left the VM unable to boot. The definition is no longer touched: libvirt decides, and its error is shown (for a running VM with raw NVRAM: 'internal snapshots of a VM with pflash based firmware require QCOW2 nvram format'). A stopped VM's disk-only internal snapshot is taken, as libvirt allows it. Revert errors are shown too. The external snapshot path keeps its rewrite for now. Live tests cover running and stopped UEFI VMs; both failed with a 500 on the previous code.
401 lines
17 KiB
Python
401 lines
17 KiB
Python
import unittest
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from unittest.mock import MagicMock
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from django.conf import settings
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if not settings.configured:
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settings.configure(MAC_OUI="52:54:10")
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from vrtManager.instance import wvmInstance
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from vrtManager.network import wvmNetworks, wvmNetwork
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class TestXmlSafety(unittest.TestCase):
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def test_create_network_escaping(self):
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wn = wvmNetworks.__new__(wvmNetworks)
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wn.wvm = MagicMock()
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mock_net = MagicMock()
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wn.get_network = MagicMock(return_value=mock_net)
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malicious_name = "net<script>alert(1)</script>&name"
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malicious_bridge = "br0' onfocus='alert(2)"
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wn.create_network(
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name=malicious_name,
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forward="bridge",
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ipv4=False,
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gateway=None,
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mask=None,
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dhcp4=None,
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ipv6=False,
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gateway6=None,
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prefix6=None,
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dhcp6=None,
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bridge=malicious_bridge,
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openvswitch=False,
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)
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wn.wvm.networkDefineXML.assert_called_once()
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defined_xml = wn.wvm.networkDefineXML.call_args[0][0]
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self.assertNotIn("<script>", defined_xml)
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self.assertIn("<script>alert(1)</script>&name", defined_xml)
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self.assertIn("name='br0' onfocus='alert(2)'", defined_xml)
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def test_network_set_qos_validation(self):
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wn = wvmNetwork.__new__(wvmNetwork)
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wn._XMLDesc = MagicMock(return_value="<network><name>testnet</name></network>")
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wn.wvm = MagicMock()
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# Invalid direction
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with self.assertRaises(ValueError):
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wn.set_qos("lateral", 100, 200, 300)
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# Invalid numeric strings
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with self.assertRaises(ValueError):
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wn.set_qos("inbound", "not_a_number", 200, 300)
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def test_snapshot_escaping_and_recovery_on_failure(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst.get_status = MagicMock(return_value=5) # shutoff
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inst.change_snapshot_xml = MagicMock()
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inst.recover_snapshot_xml = MagicMock()
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inst._XMLDesc = MagicMock(return_value="<domain></domain>")
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inst._snapshotCreateXML = MagicMock(side_effect=RuntimeError("libvirt exploded"))
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bad_name = "snap<inject>""
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bad_desc = "desc<tag>&"
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with self.assertRaises(RuntimeError):
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inst.create_snapshot(bad_name, bad_desc)
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inst.change_snapshot_xml.assert_not_called()
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inst.recover_snapshot_xml.assert_not_called()
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def test_snapshot_xml_payload_is_escaped(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst.get_status = MagicMock(return_value=5) # shutoff
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inst.change_snapshot_xml = MagicMock()
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inst.recover_snapshot_xml = MagicMock()
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inst._XMLDesc = MagicMock(return_value="<domain></domain>")
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inst._snapshotCreateXML = MagicMock(return_value=None)
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bad_name = "snap<inject>"es"
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bad_desc = "desc<tag>&and"
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inst.create_snapshot(bad_name, bad_desc)
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inst._snapshotCreateXML.assert_called_once()
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created_xml = inst._snapshotCreateXML.call_args[0][0]
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self.assertNotIn("<inject>", created_xml)
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self.assertNotIn("<tag>", created_xml)
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self.assertIn("<inject>&quotes", created_xml)
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self.assertIn("<tag>&and", created_xml)
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def test_external_snapshot_recovery(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst.get_status = MagicMock(return_value=1)
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inst.change_snapshot_xml = MagicMock()
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inst.recover_snapshot_xml = MagicMock()
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inst._XMLDesc = MagicMock(return_value="<domain></domain>")
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inst._snapshotCreateXML = MagicMock(return_value=None)
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inst.refresh_instance_pools = MagicMock()
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inst.create_external_snapshot("ext_snap_1", desc="normal snapshot")
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inst.change_snapshot_xml.assert_called_once()
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inst.recover_snapshot_xml.assert_called_once()
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inst.refresh_instance_pools.assert_called_once()
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def test_secure_boot_loader_change_and_recovery(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst.wvm = MagicMock()
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uefi_xml = "<domain><os><loader readonly='yes' secure='yes' type='pflash'>/usr/share/OVMF/OVMF.fd</loader></os></domain>"
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inst._XMLDesc = MagicMock(return_value=uefi_xml)
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inst.change_snapshot_xml()
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inst.wvm.defineXML.assert_called_once()
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changed_xml = inst.wvm.defineXML.call_args[0][0]
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self.assertIn("type=\"rom\"", changed_xml)
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self.assertIn("secure=\"yes\"", changed_xml)
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# Test recovery from rom back to pflash
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inst._XMLDesc = MagicMock(return_value=changed_xml)
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inst.wvm.defineXML.reset_mock()
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inst.recover_snapshot_xml()
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inst.wvm.defineXML.assert_called_once()
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recovered_xml = inst.wvm.defineXML.call_args[0][0]
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self.assertIn("type=\"pflash\"", recovered_xml)
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self.assertIn("secure=\"yes\"", recovered_xml)
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def test_original_rom_loader_preserved(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst._XMLDesc = MagicMock(return_value="<domain><os><loader type='rom'>/usr/share/rom.bin</loader></os></domain>")
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inst._defineXML = MagicMock()
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inst._snapshotCreateXML = MagicMock(return_value=None)
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inst.get_status = MagicMock(return_value=5)
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# change_snapshot_xml should return False and not define XML
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self.assertFalse(inst.change_snapshot_xml())
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inst._defineXML.assert_not_called()
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inst.create_snapshot("snap_rom", "testing rom preservation")
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inst._defineXML.assert_not_called()
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def test_malformed_xml_raises_in_change(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst._XMLDesc = MagicMock(return_value="<malformed << xml")
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with self.assertRaises(Exception):
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inst.change_snapshot_xml()
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def test_recovery_failure_raises(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst._XMLDesc = MagicMock(return_value="<domain><os><loader type='rom'>/path</loader></os></domain>")
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inst._defineXML = MagicMock(side_effect=RuntimeError("libvirt defineXML failed"))
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with self.assertRaises(RuntimeError):
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inst.recover_snapshot_xml()
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def test_snapshot_revert_rom_loader_preserved(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst.instance = MagicMock()
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mock_snap = MagicMock()
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inst.instance.snapshotLookupByName = MagicMock(return_value=mock_snap)
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inst.instance.revertToSnapshot = MagicMock()
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inst._defineXML = MagicMock()
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inst.snapshot_revert("snap_rom")
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inst.instance.snapshotLookupByName.assert_called_once_with("snap_rom", 0)
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inst.instance.revertToSnapshot.assert_called_once_with(mock_snap, 0)
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inst._defineXML.assert_not_called()
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def test_internal_snapshot_never_rewrites_a_pflash_loader(self):
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# R-13: libvirt decides; the definition is not switched to rom.
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inst = wvmInstance.__new__(wvmInstance)
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inst.get_status = MagicMock(return_value=5)
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inst._XMLDesc = MagicMock(
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return_value="<domain><os><loader readonly='yes' type='pflash'>/usr/share/OVMF/OVMF.fd</loader></os></domain>"
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)
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inst._defineXML = MagicMock()
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inst._snapshotCreateXML = MagicMock()
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inst.create_snapshot("snap", "uefi")
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inst._defineXML.assert_not_called()
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self.assertIn("type='pflash'", inst._snapshotCreateXML.call_args[0][0])
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if __name__ == "__main__":
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unittest.main()
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class TestDiskXmlEscaping(unittest.TestCase):
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def _instance(self):
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inst = wvmInstance.__new__(wvmInstance)
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inst.get_status = MagicMock(return_value=5) # shutoff
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inst.instance = MagicMock()
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inst._defineXML = MagicMock()
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return inst
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def test_attach_disk_escapes_source_and_serial(self):
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inst = self._instance()
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inst.attach_disk(
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"vdb",
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"/images/a'/><disk type='file",
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target_bus="virtio",
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disk_type="file",
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serial="S1</serial><evil/>",
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)
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xml = inst.instance.attachDeviceFlags.call_args[0][0]
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self.assertIn("file='/images/a'/><disk type='file'", xml)
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self.assertIn("<serial>S1</serial><evil/></serial>", xml)
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self.assertNotIn("<evil/>", xml)
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def test_edit_disk_escapes_source_and_serial(self):
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inst = self._instance()
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inst._XMLDesc = MagicMock(
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return_value=(
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"<domain><devices><disk type='file' device='disk'>"
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"<driver name='qemu' type='qcow2'/>"
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"<source file='/images/vm.qcow2'/>"
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"<target dev='vda' bus='virtio'/>"
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"</disk></devices></domain>"
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)
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)
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inst.edit_disk(
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"vda",
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"/images/b'/><x y='",
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False,
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False,
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"virtio",
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"S2<evil/>",
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"qcow2",
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"default",
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"default",
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"default",
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"default",
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)
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xml = inst._defineXML.call_args.args[0]
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from lxml import etree
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self.assertEqual(etree.fromstring(xml).find("devices/disk/source").get("file"), "/images/b'/><x y='")
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self.assertNotIn("<evil/>", xml)
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def test_detach_disk_does_not_evaluate_dev_as_xpath(self):
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inst = self._instance()
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inst._XMLDesc = MagicMock(
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return_value=(
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"<domain><devices><disk type='file' device='disk'>"
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"<source file='/images/vm.qcow2'/>"
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"<target dev='vda' bus='virtio'/>"
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"</disk></devices></domain>"
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)
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)
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with self.assertRaises(IndexError):
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inst.detach_disk("x' or '1'='1")
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inst.instance.detachDeviceFlags.assert_not_called()
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class TestPersistentDiskEditing(unittest.TestCase):
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def setUp(self):
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import libvirt
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from lxml import etree
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self.conn = libvirt.open("test:///default")
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self.addCleanup(self.conn.close)
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self.domain = self.conn.lookupByName("test")
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original = self.domain.XMLDesc(libvirt.VIR_DOMAIN_XML_INACTIVE | libvirt.VIR_DOMAIN_XML_SECURE)
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self.addCleanup(self.conn.defineXML, original)
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config = etree.fromstring(original)
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disk = config.find("devices/disk")
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disk.set("type", "file")
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driver = disk.find("driver")
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if driver is None:
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driver = etree.SubElement(disk, "driver")
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driver.set("name", "qemu")
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driver.set("type", "qcow2")
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driver.set("queues", "4")
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etree.SubElement(disk, "address", type="pci", slot="0x05")
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encryption = etree.SubElement(disk, "encryption", format="luks")
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etree.SubElement(encryption, "secret", type="passphrase", uuid="aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
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etree.SubElement(etree.SubElement(disk, "iotune"), "total_bytes_sec").text = "1024"
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# A pending change and a VNC password outside the edited disk must survive.
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config.find("memory").text = "123456"
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etree.SubElement(config.find("devices"), "graphics", type="vnc", passwd="keep-secret")
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self.conn.defineXML(etree.tostring(config).decode())
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self.inst = wvmInstance.__new__(wvmInstance)
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self.inst.wvm = self.conn
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self.inst.instance = self.domain
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self.target = disk.find("target").get("dev")
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def config(self):
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import libvirt
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from lxml import etree
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return etree.fromstring(self.domain.XMLDesc(libvirt.VIR_DOMAIN_XML_INACTIVE | libvirt.VIR_DOMAIN_XML_SECURE))
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def edit(self, bus="virtio", format="qcow2"):
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self.inst.edit_disk(
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self.target, "/images/a'<new>&.qcow2", False, False, bus,
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"serial<&", format, "none", "native", "unmap", "on",
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)
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def test_running_bus_change_preserves_disk_and_pending_domain_configuration(self):
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self.assertTrue(self.domain.isActive())
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live_before = self.domain.XMLDesc(0)
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self.edit(bus="sata")
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config = self.config()
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disk = config.find("devices/disk")
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self.assertEqual(disk.find("target").get("bus"), "sata")
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self.assertTrue(disk.find("target").get("dev").startswith("sd"))
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self.assertNotEqual(disk.find("address").get("type"), "pci")
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self.assertIsNone(disk.find("driver").get("queues"))
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self.assertEqual(disk.find("driver").get("cache"), "none")
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self.assertEqual(disk.findtext("iotune/total_bytes_sec"), "1024")
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self.assertEqual(disk.find("encryption/secret").get("uuid"), "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
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self.assertEqual(disk.find("source").get("file"), "/images/a'<new>&.qcow2")
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self.assertEqual(disk.findtext("serial"), "serial<&")
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self.assertEqual(config.findtext("memory"), "123456")
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self.assertEqual(config.find("devices/graphics").get("passwd"), "keep-secret")
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self.assertEqual(self.domain.XMLDesc(0), live_before)
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# The resulting disk can be edited again before the VM restarts.
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self.target = disk.find("target").get("dev")
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self.edit(bus="sata")
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self.assertEqual(self.config().find("devices/disk/target").get("dev"), self.target)
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def test_failed_definition_leaves_the_original_configuration_intact(self):
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from libvirt import libvirtError
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from unittest.mock import patch
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before = self.domain.XMLDesc(2)
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with patch.object(self.inst, "_defineXML", side_effect=libvirtError("definition failed")):
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with self.assertRaises(libvirtError):
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self.edit(bus="sata")
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self.assertEqual(self.domain.XMLDesc(2), before)
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def test_network_disk_keeps_auth_source_and_encryption(self):
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from lxml import etree
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config = self.config()
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disk = config.find("devices/disk")
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disk.set("type", "network")
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disk.remove(disk.find("source"))
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source = etree.SubElement(disk, "source", protocol="rbd", name="pool/vm-disk")
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etree.SubElement(source, "host", name="mon1", port="6789")
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auth = etree.SubElement(disk, "auth", username="libvirt")
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etree.SubElement(auth, "secret", type="ceph", uuid="aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
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self.conn.defineXML(etree.tostring(config).decode())
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self.edit(bus="sata")
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result = self.config().find("devices/disk")
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self.assertEqual(result.find("source").get("name"), "pool/vm-disk")
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self.assertEqual(result.find("source/host").get("name"), "mon1")
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self.assertEqual(result.find("auth").get("username"), "libvirt")
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self.assertIsNotNone(result.find("encryption"))
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def test_empty_format_omits_driver_type(self):
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self.edit(format="")
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self.assertIsNone(self.config().find("devices/disk/driver").get("type"))
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def test_virtio_options_survive_editing_on_the_same_bus(self):
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self.edit()
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self.assertEqual(self.config().find("devices/disk/driver").get("queues"), "4")
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class TestEmptyDiskClone(unittest.TestCase):
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def test_clone_omits_empty_disks_before_real_libvirt_definition(self):
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import libvirt
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from lxml import etree
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conn = libvirt.open("test:///default")
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self.addCleanup(conn.close)
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domain = conn.lookupByName("test")
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config = etree.fromstring(domain.XMLDesc(libvirt.VIR_DOMAIN_XML_INACTIVE))
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devices = config.find("devices")
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for disk in devices.findall("disk"):
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source = disk.find("source")
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if source is not None:
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disk.remove(source)
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for interface in devices.findall("interface"):
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devices.remove(interface)
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inst = wvmInstance.__new__(wvmInstance)
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inst.wvm = conn
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inst.instance = domain
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# Exercise defensive handling of incomplete disk metadata, while the
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# clone is still defined and looked up through the real test driver.
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inst._XMLDesc = MagicMock(return_value=etree.tostring(config).decode())
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clone_uuid = inst.clone_instance({"name": "empty-disk-clone"})
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clone = conn.lookupByUUIDString(clone_uuid)
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self.addCleanup(clone.undefine)
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clone_config = etree.fromstring(clone.XMLDesc(libvirt.VIR_DOMAIN_XML_INACTIVE))
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self.assertEqual(clone_config.findtext("name"), "empty-disk-clone")
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self.assertEqual(clone_config.findall("devices/disk"), [])
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self.assertTrue(config.findall("devices/disk"))
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def test_clone_rejects_existing_name_before_allocating_storage(self):
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import libvirt
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conn = libvirt.open("test:///default")
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self.addCleanup(conn.close)
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inst = wvmInstance.__new__(wvmInstance)
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inst.wvm = conn
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inst.instance = conn.lookupByName("test")
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inst._XMLDesc = MagicMock()
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with self.assertRaisesRegex(ValueError, "already exists"):
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inst.clone_instance({"name": "test"})
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inst._XMLDesc.assert_not_called()
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