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libvirt/tests/qemusecuritytest.c
Michal Privoznik df8ff46a16 qemusecuritytest: Test SELinux too 
The qemusecuritytest checks for random domain XMLs from
qemuxml2argvdata/ whether set+restore seclabels leaves something
behind. It can be an XATTR that we forgot to remove or a file
that the owner was not restored on. But so far only DAC driver is
checked. Implement missing pieces and enable SELinux testing too.

This is done by mocking some libselinux APIs and following the
same logic used for DAC - everything is implemented in memory,
there is new hash table introduced that holds SELinux labels for
paths that were setfilecon_raw()-ed and in the end the hash table
is checked for entries that don't have the default SELinux label
(i.e. were not restored).

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
2020-11-06 09:14:01 +01:00

265 lines
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/*
* Copyright (C) 2018 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "qemusecuritytest.h"
#include "testutils.h"
#include "testutilsqemu.h"
#include "security/security_manager.h"
#include "conf/domain_conf.h"
#include "qemu/qemu_domain.h"
#include "qemu/qemu_security.h"
#define VIR_FROM_THIS VIR_FROM_NONE
struct testData {
virQEMUDriverPtr driver;
const char *file; /* file name to load VM def XML from; qemuxml2argvdata/ */
};
static int
prepareObjects(virQEMUDriverPtr driver,
const char *xmlname,
virDomainObjPtr *vm_ret)
{
qemuDomainObjPrivatePtr priv;
g_autoptr(virDomainObj) vm = NULL;
g_autofree char *filename = NULL;
g_autofree char *domxml = NULL;
g_autofree char *latestCapsFile = NULL;
filename = g_strdup_printf("%s/qemuxml2argvdata/%s.xml", abs_srcdir, xmlname);
if (virTestLoadFile(filename, &domxml) < 0)
return -1;
if (!(vm = virDomainObjNew(driver->xmlopt)))
return -1;
vm->pid = -1;
priv = vm->privateData;
priv->chardevStdioLogd = false;
priv->rememberOwner = true;
if (!(latestCapsFile = testQemuGetLatestCapsForArch("x86_64", "xml")))
return -1;
if (!(priv->qemuCaps = qemuTestParseCapabilitiesArch(VIR_ARCH_X86_64, latestCapsFile)))
return -1;
if (qemuTestCapsCacheInsert(driver->qemuCapsCache, priv->qemuCaps) < 0)
return -1;
if (!(vm->def = virDomainDefParseString(domxml,
driver->xmlopt,
NULL,
0)))
return -1;
if (virSecurityManagerGenLabel(driver->securityManager, vm->def) < 0)
return -1;
*vm_ret = g_steal_pointer(&vm);
return 0;
}
static int
testDomain(const void *opaque)
{
const struct testData *data = opaque;
g_autoptr(virDomainObj) vm = NULL;
VIR_AUTOSTRINGLIST notRestored = NULL;
size_t i;
int ret = -1;
if (prepareObjects(data->driver, data->file, &vm) < 0)
return -1;
for (i = 0; i < vm->def->ndisks; i++) {
virStorageSourcePtr src = vm->def->disks[i]->src;
virStorageSourcePtr n;
if (!src)
continue;
if (virStorageSourceIsLocalStorage(src) && src->path &&
(src->shared || src->readonly) &&
virStringListAdd(&notRestored, src->path) < 0)
return -1;
for (n = src->backingStore; virStorageSourceIsBacking(n); n = n->backingStore) {
if (virStorageSourceIsLocalStorage(n) && n->path &&
virStringListAdd(&notRestored, n->path) < 0)
return -1;
}
}
/* Mocking is enabled only when this env variable is set.
* See mock code for explanation. */
if (g_setenv(ENVVAR, "1", FALSE) == FALSE)
return -1;
if (qemuSecuritySetAllLabel(data->driver, vm, NULL, false) < 0)
goto cleanup;
qemuSecurityRestoreAllLabel(data->driver, vm, false);
if (checkPaths((const char **) notRestored) < 0)
goto cleanup;
ret = 0;
cleanup:
g_unsetenv(ENVVAR);
freePaths();
return ret;
}
static int
mymain(void)
{
virQEMUDriver driver;
virSecurityManagerPtr stack = NULL;
virSecurityManagerPtr dac = NULL;
#ifdef WITH_SELINUX
virSecurityManagerPtr selinux = NULL;
#endif
int ret = 0;
if (virInitialize() < 0 ||
qemuTestDriverInit(&driver) < 0)
return -1;
/* Now fix the secdriver */
virObjectUnref(driver.securityManager);
if (!(dac = virSecurityManagerNewDAC("test", 1000, 1000,
VIR_SECURITY_MANAGER_PRIVILEGED |
VIR_SECURITY_MANAGER_DYNAMIC_OWNERSHIP,
NULL))) {
fprintf(stderr, "Cannot initialize DAC security driver");
ret = -1;
goto cleanup;
}
if (!(stack = virSecurityManagerNewStack(dac))) {
fprintf(stderr, "Cannot initialize stack security driver");
ret = -1;
goto cleanup;
}
dac = NULL;
#if WITH_SELINUX
selinux = virSecurityManagerNew("selinux", "test",
VIR_SECURITY_MANAGER_PRIVILEGED |
VIR_SECURITY_MANAGER_DEFAULT_CONFINED |
VIR_SECURITY_MANAGER_REQUIRE_CONFINED);
if (!selinux) {
fprintf(stderr, "Cannot initialize selinux security driver");
ret = -1;
goto cleanup;
}
if (virSecurityManagerStackAddNested(stack, selinux) < 0) {
fprintf(stderr, "Cannot add selinux security driver onto stack");
ret = -1;
goto cleanup;
}
selinux = NULL;
#endif
driver.securityManager = g_steal_pointer(&stack);
#define DO_TEST_DOMAIN(f) \
do { \
struct testData data = {.driver = &driver, .file = f}; \
if (virTestRun(f, testDomain, &data) < 0) \
ret = -1; \
} while (0)
DO_TEST_DOMAIN("acpi-table");
DO_TEST_DOMAIN("channel-unix-guestfwd");
DO_TEST_DOMAIN("console-virtio-unix");
DO_TEST_DOMAIN("controller-virtio-scsi");
DO_TEST_DOMAIN("disk-aio");
DO_TEST_DOMAIN("disk-backing-chains-noindex");
DO_TEST_DOMAIN("disk-cache");
DO_TEST_DOMAIN("disk-cdrom");
DO_TEST_DOMAIN("disk-cdrom-bus-other");
DO_TEST_DOMAIN("disk-cdrom-network");
DO_TEST_DOMAIN("disk-cdrom-tray");
DO_TEST_DOMAIN("disk-copy_on_read");
DO_TEST_DOMAIN("disk-detect-zeroes");
DO_TEST_DOMAIN("disk-error-policy");
DO_TEST_DOMAIN("disk-floppy");
DO_TEST_DOMAIN("disk-floppy-q35-2_11");
DO_TEST_DOMAIN("disk-floppy-q35-2_9");
DO_TEST_DOMAIN("disk-network-gluster");
DO_TEST_DOMAIN("disk-network-iscsi");
DO_TEST_DOMAIN("disk-network-nbd");
DO_TEST_DOMAIN("disk-network-rbd");
DO_TEST_DOMAIN("disk-network-sheepdog");
DO_TEST_DOMAIN("disk-network-source-auth");
DO_TEST_DOMAIN("disk-network-tlsx509-nbd");
DO_TEST_DOMAIN("disk-network-tlsx509-vxhs");
DO_TEST_DOMAIN("disk-readonly-disk");
DO_TEST_DOMAIN("disk-scsi");
DO_TEST_DOMAIN("disk-scsi-device-auto");
DO_TEST_DOMAIN("disk-shared");
DO_TEST_DOMAIN("disk-virtio");
DO_TEST_DOMAIN("disk-virtio-scsi-reservations");
DO_TEST_DOMAIN("graphics-vnc-tls-secret");
DO_TEST_DOMAIN("hugepages-nvdimm");
DO_TEST_DOMAIN("iothreads-virtio-scsi-pci");
DO_TEST_DOMAIN("memory-hotplug-nvdimm");
DO_TEST_DOMAIN("memory-hotplug-nvdimm-access");
DO_TEST_DOMAIN("memory-hotplug-nvdimm-align");
DO_TEST_DOMAIN("memory-hotplug-nvdimm-label");
DO_TEST_DOMAIN("memory-hotplug-nvdimm-pmem");
DO_TEST_DOMAIN("memory-hotplug-nvdimm-readonly");
DO_TEST_DOMAIN("net-vhostuser");
DO_TEST_DOMAIN("os-firmware-bios");
DO_TEST_DOMAIN("os-firmware-efi");
DO_TEST_DOMAIN("os-firmware-efi-secboot");
DO_TEST_DOMAIN("pci-bridge-many-disks");
DO_TEST_DOMAIN("tseg-explicit-size");
DO_TEST_DOMAIN("usb-redir-unix");
DO_TEST_DOMAIN("virtio-non-transitional");
DO_TEST_DOMAIN("virtio-transitional");
DO_TEST_DOMAIN("x86_64-pc-graphics");
DO_TEST_DOMAIN("x86_64-pc-headless");
DO_TEST_DOMAIN("x86_64-q35-graphics");
DO_TEST_DOMAIN("x86_64-q35-headless");
cleanup:
qemuTestDriverFree(&driver);
#ifdef WITH_SELINUX
virObjectUnref(selinux);
#endif
virObjectUnref(dac);
virObjectUnref(stack);
return ret;
}
VIR_TEST_MAIN_PRELOAD(mymain,
VIR_TEST_MOCK("domaincaps"))
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