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libvirt/tests/securityselinuxlabeltest.c
Andrea Bolognani 6952af8b43 qemu: Propagate shared_filesystems 
virFileIsSharedFS() is the function that ultimately decides
whether a filesystem should be considered shared, but the list
of manually configured shared filesystems is part of the QEMU
driver's configuration, so we need to pass the information
through several layers in order to make use of it.

Note that with this change the list is propagated all the way
through, but its contents are still ignored, so the behavior
remains the same for now.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
2024-10-03 13:29:26 +02:00

351 lines
9.2 KiB
C
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/*
* Copyright (C) 2011-2014 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, write to the Free Software
* License along with this library; If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include <time.h>
#include <selinux/selinux.h>
#include <selinux/context.h>
#include <sys/xattr.h>
#include "internal.h"
#include "testutils.h"
#include "testutilsqemu.h"
#include "viralloc.h"
#include "virerror.h"
#include "virfile.h"
#include "virlog.h"
#include "security/security_manager.h"
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_LOG_INIT("tests.securityselinuxlabeltest");
static virQEMUDriver driver;
static virSecurityManager *mgr;
typedef struct testSELinuxFile testSELinuxFile;
struct testSELinuxFile {
char *file;
char *context;
};
static int
testUserXattrEnabled(void)
{
int ret = -1;
ssize_t len;
const char *con_value = "system_u:object_r:svirt_image_t:s0:c41,c264";
g_autofree char *path = NULL;
path = g_strdup_printf("%s/securityselinuxlabeldata/testxattr", abs_builddir);
if (g_mkdir_with_parents(abs_builddir "/securityselinuxlabeldata", 0777) < 0 ||
virFileTouch(path, 0600) < 0)
goto cleanup;
len = setxattr(path, "user.libvirt.selinux", con_value,
strlen(con_value), 0);
if (len < 0) {
if (errno == EOPNOTSUPP)
ret = 0;
goto cleanup;
}
ret = 1;
cleanup:
unlink(path);
rmdir(abs_builddir "/securityselinuxlabeldata");
return ret;
}
static void
testSELinuxMungePath(char **path)
{
char *tmp = g_strdup_printf("%s/securityselinuxlabeldata%s", abs_builddir, *path);
g_free(*path);
*path = tmp;
}
static int
testSELinuxLoadFileList(const char *testname,
testSELinuxFile **files,
size_t *nfiles)
{
g_autofree char *path = NULL;
g_autoptr(FILE) fp = NULL;
g_autofree char *line = NULL;
*files = NULL;
*nfiles = 0;
path = g_strdup_printf("%s/securityselinuxlabeldata/%s.txt", abs_srcdir,
testname);
if (!(fp = fopen(path, "r")))
return -1;
line = g_new0(char, 1024);
while (!feof(fp)) {
char *file = NULL, *context = NULL, *tmp;
if (!fgets(line, 1024, fp)) {
if (!feof(fp))
return -1;
break;
}
tmp = strchr(line, ';');
if (!tmp) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"unexpected format for line '%s'",
line);
return -1;
}
*tmp = '\0';
tmp++;
file = g_strdup_printf("%s/securityselinuxlabeldata%s", abs_builddir,
line);
if (*tmp != '\0' && *tmp != '\n') {
context = g_strdup(tmp);
tmp = strchr(context, '\n');
if (tmp)
*tmp = '\0';
}
VIR_EXPAND_N(*files, *nfiles, 1);
(*files)[(*nfiles)-1].file = file;
(*files)[(*nfiles)-1].context = context;
}
return 0;
}
static virDomainDef *
testSELinuxLoadDef(const char *testname)
{
g_autofree char *xmlfile = NULL;
virDomainDef *def = NULL;
size_t i;
xmlfile = g_strdup_printf("%s/securityselinuxlabeldata/%s.xml", abs_srcdir,
testname);
if (!(def = virDomainDefParseFile(xmlfile, driver.xmlopt,
NULL, 0)))
return NULL;
for (i = 0; i < def->ndisks; i++) {
if (def->disks[i]->src->type != VIR_STORAGE_TYPE_FILE &&
def->disks[i]->src->type != VIR_STORAGE_TYPE_BLOCK)
continue;
testSELinuxMungePath(&def->disks[i]->src->path);
}
for (i = 0; i < def->nserials; i++) {
if (def->serials[i]->source->type != VIR_DOMAIN_CHR_TYPE_FILE &&
def->serials[i]->source->type != VIR_DOMAIN_CHR_TYPE_PIPE &&
def->serials[i]->source->type != VIR_DOMAIN_CHR_TYPE_DEV &&
def->serials[i]->source->type != VIR_DOMAIN_CHR_TYPE_UNIX)
continue;
if (def->serials[i]->source->type == VIR_DOMAIN_CHR_TYPE_UNIX) {
testSELinuxMungePath(&def->serials[i]->source->data.nix.path);
} else {
testSELinuxMungePath(&def->serials[i]->source->data.file.path);
}
}
if (def->os.kernel)
testSELinuxMungePath(&def->os.kernel);
if (def->os.initrd)
testSELinuxMungePath(&def->os.initrd);
return def;
}
static int
testSELinuxCreateDisks(testSELinuxFile *files, size_t nfiles)
{
size_t i;
if (g_mkdir_with_parents(abs_builddir "/securityselinuxlabeldata/nfs", 0777) < 0)
return -1;
for (i = 0; i < nfiles; i++) {
if (virFileTouch(files[i].file, 0600) < 0)
return -1;
}
return 0;
}
static int
testSELinuxDeleteDisks(testSELinuxFile *files, size_t nfiles)
{
size_t i;
for (i = 0; i < nfiles; i++) {
if (unlink(files[i].file) < 0)
return -1;
}
if (rmdir(abs_builddir "/securityselinuxlabeldata/nfs") < 0)
return -1;
/* Ignore failure to remove non-empty directory with in-tree build */
rmdir(abs_builddir "/securityselinuxlabeldata");
return 0;
}
static int
testSELinuxCheckLabels(testSELinuxFile *files, size_t nfiles)
{
size_t i;
for (i = 0; i < nfiles; i++) {
g_autofree char *ctx = NULL;
if (getfilecon(files[i].file, &ctx) < 0) {
if (errno == ENODATA) {
/* nothing to do */
} else if (errno == EOPNOTSUPP) {
ctx = g_strdup("EOPNOTSUPP");
} else {
virReportSystemError(errno,
"Cannot read label on %s",
files[i].file);
return -1;
}
}
if (STRNEQ_NULLABLE(files[i].context, ctx)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"File %s context '%s' did not match expected '%s'",
files[i].file, ctx, files[i].context);
return -1;
}
}
return 0;
}
static int
testSELinuxLabeling(const void *opaque)
{
const char *testname = opaque;
int ret = -1;
testSELinuxFile *files = NULL;
size_t nfiles = 0;
size_t i;
g_autoptr(virDomainDef) def = NULL;
if (testSELinuxLoadFileList(testname, &files, &nfiles) < 0)
goto cleanup;
if (testSELinuxCreateDisks(files, nfiles) < 0)
goto cleanup;
if (!(def = testSELinuxLoadDef(testname)))
goto cleanup;
if (virSecurityManagerSetAllLabel(mgr, NULL, def, NULL, false, false) < 0)
goto cleanup;
if (testSELinuxCheckLabels(files, nfiles) < 0)
goto cleanup;
ret = 0;
cleanup:
if (testSELinuxDeleteDisks(files, nfiles) < 0)
VIR_WARN("unable to fully clean up");
for (i = 0; i < nfiles; i++) {
VIR_FREE(files[i].file);
VIR_FREE(files[i].context);
}
VIR_FREE(files);
if (ret < 0)
VIR_TEST_VERBOSE("%s", virGetLastErrorMessage());
return ret;
}
static int
mymain(void)
{
int ret = 0;
int rc = testUserXattrEnabled();
g_autoptr(GHashTable) capslatest = testQemuGetLatestCaps();
g_autoptr(GHashTable) capscache = virHashNew(virObjectUnref);
if (rc < 0) {
VIR_TEST_VERBOSE("failed to determine xattr support");
return EXIT_FAILURE;
}
if (rc == 0) {
VIR_TEST_VERBOSE("xattr unsupported");
return EXIT_AM_SKIP;
}
if (!(mgr = virSecurityManagerNew("selinux", "QEMU",
VIR_SECURITY_MANAGER_DEFAULT_CONFINED |
VIR_SECURITY_MANAGER_PRIVILEGED))) {
VIR_TEST_VERBOSE("Unable to initialize security driver: %s",
virGetLastErrorMessage());
return EXIT_FAILURE;
}
if (qemuTestDriverInit(&driver) < 0)
return EXIT_FAILURE;
qemuTestSetHostArch(&driver, VIR_ARCH_X86_64);
if (testQemuInsertRealCaps(driver.qemuCapsCache, "x86_64", "latest", "",
capslatest, capscache, NULL, NULL) < 0)
return EXIT_FAILURE;
#define DO_TEST_LABELING(name) \
if (virTestRun("Labelling " # name, testSELinuxLabeling, name) < 0) \
ret = -1;
setcon("system_r:system_u:libvirtd_t:s0:c0.c1023");
DO_TEST_LABELING("disks");
DO_TEST_LABELING("kernel");
DO_TEST_LABELING("chardev");
DO_TEST_LABELING("nfs");
qemuTestDriverFree(&driver);
return (ret == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}
VIR_TEST_MAIN_PRELOAD(mymain,
VIR_TEST_MOCK("domaincaps"),
"libsecurityselinuxhelper.so")
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