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When creating the system identity set the system token. The system token is currently stored in a local path /var/run/libvirt/common/system.token Obviously with only traditional UNIX DAC in effect, this is largely security through obscurity, if the client is running at the same privilege level as the daemon. It does, however, reliably distinguish an unprivileged client from the system daemons. With a MAC system like SELinux though, or possible use of containers, access can be further restricted. A possible future improvement for Linux would be to populate the kernel keyring with a secret for libvirt daemons to share. Reviewed-by: Michal Privoznik <mprivozn@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
173 lines
4.3 KiB
C
173 lines
4.3 KiB
C
/*
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* Copyright (C) 2013, 2014 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#if WITH_SELINUX
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# include <selinux/selinux.h>
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#endif
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#include "testutils.h"
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#define LIBVIRT_VIRIDENTITYPRIV_H_ALLOW
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#include "viridentitypriv.h"
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#include "virerror.h"
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#include "viralloc.h"
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#include "virlog.h"
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#include "virlockspace.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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VIR_LOG_INIT("tests.identitytest");
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char *
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virIdentityEnsureSystemToken(void)
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{
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return g_strdup("3de80bcbf22d4833897f1638e01be9b2");
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}
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static int testIdentityAttrs(const void *data G_GNUC_UNUSED)
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{
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g_autoptr(virIdentity) ident = virIdentityNew();
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const char *val;
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int rc;
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if (virIdentitySetUserName(ident, "fred") < 0)
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return -1;
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if ((rc = virIdentityGetUserName(ident, &val)) < 0)
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return -1;
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if (STRNEQ_NULLABLE(val, "fred") || rc != 1) {
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VIR_DEBUG("Expected 'fred' got '%s'", NULLSTR(val));
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return -1;
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}
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if ((rc = virIdentityGetGroupName(ident, &val)) < 0)
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return -1;
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if (val != NULL || rc != 0) {
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VIR_DEBUG("Unexpected groupname attribute");
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return -1;
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}
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if (virIdentitySetUserName(ident, "joe") >= 0) {
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VIR_DEBUG("Unexpectedly overwrote attribute");
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return -1;
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}
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if ((rc = virIdentityGetUserName(ident, &val)) < 0)
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return -1;
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if (STRNEQ_NULLABLE(val, "fred") || rc != 1) {
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VIR_DEBUG("Expected 'fred' got '%s'", NULLSTR(val));
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return -1;
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}
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return 0;
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}
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static int testIdentityGetSystem(const void *data)
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{
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const char *context = data;
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g_autoptr(virIdentity) ident = NULL;
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const char *val;
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int rc;
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#if !WITH_SELINUX
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if (context) {
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VIR_DEBUG("libvirt not compiled with SELinux, skipping this test");
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return EXIT_AM_SKIP;
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}
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#endif
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if (!(ident = virIdentityGetSystem())) {
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VIR_DEBUG("Unable to get system identity");
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return -1;
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}
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if ((rc = virIdentityGetSELinuxContext(ident, &val)) < 0)
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return -1;
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if (context == NULL) {
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if (val != NULL || rc != 0) {
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VIR_DEBUG("Unexpected SELinux context %s", NULLSTR(val));
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return -1;
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}
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} else {
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if (STRNEQ_NULLABLE(val, context) || rc != 1) {
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VIR_DEBUG("Want SELinux context '%s' got '%s'",
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context, val);
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return -1;
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}
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}
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return 0;
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}
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static int testSetFakeSELinuxContext(const void *data G_GNUC_UNUSED)
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{
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#if WITH_SELINUX
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return setcon_raw(data);
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#else
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VIR_DEBUG("libvirt not compiled with SELinux, skipping this test");
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return EXIT_AM_SKIP;
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#endif
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}
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static int testDisableFakeSELinux(const void *data G_GNUC_UNUSED)
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{
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#if WITH_SELINUX
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return security_disable();
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#else
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VIR_DEBUG("libvirt not compiled with SELinux, skipping this test");
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return EXIT_AM_SKIP;
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#endif
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}
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static int
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mymain(void)
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{
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const char *context = "unconfined_u:unconfined_r:unconfined_t:s0";
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int ret = 0;
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if (virTestRun("Identity attributes ", testIdentityAttrs, NULL) < 0)
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ret = -1;
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if (virTestRun("Setting fake SELinux context ", testSetFakeSELinuxContext, context) < 0)
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ret = -1;
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if (virTestRun("System identity (fake SELinux enabled) ", testIdentityGetSystem, context) < 0)
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ret = -1;
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if (virTestRun("Disabling fake SELinux ", testDisableFakeSELinux, NULL) < 0)
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ret = -1;
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if (virTestRun("System identity (fake SELinux disabled) ", testIdentityGetSystem, NULL) < 0)
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ret = -1;
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return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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#if WITH_SELINUX
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VIR_TEST_MAIN_PRELOAD(mymain, abs_builddir "/libsecurityselinuxhelper.so")
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#else
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VIR_TEST_MAIN(mymain)
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#endif
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