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libvirt/tests/securityselinuxlabeltest.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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <selinux/selinux.h>
#include <selinux/context.h>
#include <attr/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 virCapsPtr caps;
static virQEMUDriver driver;
static virSecurityManagerPtr 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";
char *path = NULL;
if (virAsprintf(&path, "%s/securityselinuxlabeldata/testxattr",
abs_builddir) < 0)
goto cleanup;
if (virFileMakePath(abs_builddir "/securityselinuxlabeldata") < 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");
VIR_FREE(path);
return ret;
}
static int
testSELinuxMungePath(char **path)
{
char *tmp;
if (virAsprintf(&tmp, "%s/securityselinuxlabeldata%s",
abs_builddir, *path) < 0)
return -1;
VIR_FREE(*path);
*path = tmp;
return 0;
}
static int
testSELinuxLoadFileList(const char *testname,
testSELinuxFile **files,
size_t *nfiles)
{
int ret = -1;
char *path = NULL;
FILE *fp = NULL;
char *line = NULL;
*files = NULL;
*nfiles = 0;
if (virAsprintf(&path, "%s/securityselinuxlabeldata/%s.txt",
abs_srcdir, testname) < 0)
goto cleanup;
if (!(fp = fopen(path, "r")))
goto cleanup;
if (VIR_ALLOC_N(line, 1024) < 0)
goto cleanup;
while (!feof(fp)) {
char *file = NULL, *context = NULL, *tmp;
if (!fgets(line, 1024, fp)) {
if (!feof(fp))
goto cleanup;
break;
}
tmp = strchr(line, ';');
if (!tmp) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"unexpected format for line '%s'",
line);
goto cleanup;
}
*tmp = '\0';
tmp++;
if (virAsprintf(&file, "%s/securityselinuxlabeldata%s",
abs_builddir, line) < 0)
goto cleanup;
if (*tmp != '\0' && *tmp != '\n') {
if (VIR_STRDUP(context, tmp) < 0) {
VIR_FREE(file);
goto cleanup;
}
tmp = strchr(context, '\n');
if (tmp)
*tmp = '\0';
}
if (VIR_EXPAND_N(*files, *nfiles, 1) < 0) {
VIR_FREE(file);
VIR_FREE(context);
goto cleanup;
}
(*files)[(*nfiles)-1].file = file;
(*files)[(*nfiles)-1].context = context;
}
ret = 0;
cleanup:
VIR_FORCE_FCLOSE(fp);
VIR_FREE(path);
VIR_FREE(line);
return ret;
}
static virDomainDefPtr
testSELinuxLoadDef(const char *testname)
{
char *xmlfile = NULL;
virDomainDefPtr def = NULL;
size_t i;
if (virAsprintf(&xmlfile, "%s/securityselinuxlabeldata/%s.xml",
abs_srcdir, testname) < 0)
goto cleanup;
if (!(def = virDomainDefParseFile(xmlfile, caps, driver.xmlopt, 0)))
goto cleanup;
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;
if (testSELinuxMungePath(&def->disks[i]->src->path) < 0)
goto cleanup;
}
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) {
if (testSELinuxMungePath(&def->serials[i]->source.data.nix.path) < 0)
goto cleanup;
} else {
if (testSELinuxMungePath(&def->serials[i]->source.data.file.path) < 0)
goto cleanup;
}
}
if (def->os.kernel &&
testSELinuxMungePath(&def->os.kernel) < 0)
goto cleanup;
if (def->os.initrd &&
testSELinuxMungePath(&def->os.initrd) < 0)
goto cleanup;
cleanup:
VIR_FREE(xmlfile);
return def;
}
static int
testSELinuxCreateDisks(testSELinuxFile *files, size_t nfiles)
{
size_t i;
if (virFileMakePath(abs_builddir "/securityselinuxlabeldata/nfs") < 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;
security_context_t ctx;
for (i = 0; i < nfiles; i++) {
ctx = NULL;
if (getfilecon(files[i].file, &ctx) < 0) {
if (errno == ENODATA) {
/* nothing to do */
} else if (errno == EOPNOTSUPP) {
if (VIR_STRDUP(ctx, "EOPNOTSUPP") < 0)
return -1;
} 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 epected '%s'",
files[i].file, ctx, files[i].context);
VIR_FREE(ctx);
return -1;
}
VIR_FREE(ctx);
}
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;
virDomainDefPtr 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) < 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");
virDomainDefFree(def);
for (i = 0; i < nfiles; i++) {
VIR_FREE(files[i].file);
VIR_FREE(files[i].context);
}
VIR_FREE(files);
if (ret < 0) {
virErrorPtr err = virGetLastError();
VIR_TEST_VERBOSE("%s\n", err ? err->message : "<unknown>");
}
return ret;
}
static int
mymain(void)
{
int ret = 0;
int rc = testUserXattrEnabled();
if (rc < 0)
return EXIT_FAILURE;
if (!rc)
return EXIT_AM_SKIP;
if (!(mgr = virSecurityManagerNew("selinux", "QEMU",
VIR_SECURITY_MANAGER_DEFAULT_CONFINED |
VIR_SECURITY_MANAGER_PRIVILEGED))) {
virErrorPtr err = virGetLastError();
VIR_TEST_VERBOSE("Unable to initialize security driver: %s\n",
err->message);
return EXIT_FAILURE;
}
if ((caps = testQemuCapsInit()) == NULL)
return EXIT_FAILURE;
if (qemuTestDriverInit(&driver) < 0)
return EXIT_FAILURE;
#define DO_TEST_LABELING(name) \
if (virTestRun("Labelling " # name, testSELinuxLabeling, name) < 0) \
ret = -1;
setcon((security_context_t)"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;
}
VIRT_TEST_MAIN_PRELOAD(mymain, abs_builddir "/.libs/libsecurityselinuxhelper.so")
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