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libvirt/tests/securityselinuxlabeltest.c
Ján Tomko 5c706266cb tests: refactor testSELinuxLoadDef 
Since its introduction in
commit 907a39e735
    Add a test suite for validating SELinux labelling

this function did not return NULL on OOM.

Since we abort on OOM now, switch testSELinuxMungePath to void,
return NULL explicitly on XML parsing failure and remove
the (now pointless) cleanup label.

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
2022-01-31 20:37:48 +01:00

355 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 "qemu/qemu_domain.h"
#include "viralloc.h"
#include "virerror.h"
#include "virfile.h"
#include "virlog.h"
#include "security/security_manager.h"
#include "virstring.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, 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(virQEMUCaps) qemuCaps = NULL;
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;
if (!(qemuCaps = virQEMUCapsNew()))
return EXIT_FAILURE;
virQEMUCapsSet(qemuCaps, QEMU_CAPS_DEVICE_CIRRUS_VGA);
virQEMUCapsSet(qemuCaps, QEMU_CAPS_VNC);
if (qemuTestCapsCacheInsert(driver.qemuCapsCache, qemuCaps) < 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"),
abs_builddir "/libsecurityselinuxhelper.so")
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