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Add a test suite for validating SELinux labelling

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There are many aspects of the guest XML which result in the
SELinux driver applying file labelling. With the increasing
configuration options it is desirable to test this behaviour.
It is not possible to assume that the test suite has the
ability to set SELinux labels. Most filesystems though will
support extended attributes. Thus for the purpose of testing,
it is possible to extend the existing LD_PRELOAD hack to
override setfilecon() and getfilecon() to simply use the
'user.libvirt.selinux' attribute for the sake of testing.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2012-09-19 14:00:34 +01:00
parent cf7ac00ebd
commit 907a39e735
15 changed files with 537 additions and 5 deletions
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1
.gitignore vendored
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@ -158,6 +158,7 @@
/tests/secaatest
/tests/seclabeltest
/tests/securityselinuxtest
/tests/securityselinuxlabeltest
/tests/sexpr2xmltest
/tests/shunloadtest
/tests/sockettest

2
HACKING
View File

@ -689,7 +689,7 @@ stick to the following general plan for all *.c source files:
#include <string.h>
#include <limits.h>
#if HAVE_NUMACTL Some system includes aren't supported
#if WITH_NUMACTL Some system includes aren't supported
# include <numa.h> everywhere so need these #if guards.
#endif

2
cfg.mk
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@ -795,7 +795,7 @@ exclude_file_name_regexp--sc_prohibit_nonreentrant = \
^((po|tests)/|docs/.*py|run.in$$)
exclude_file_name_regexp--sc_prohibit_raw_allocation = \
^(src/util/viralloc\.[ch]|examples/.*)$$
^(src/util/viralloc\.[ch]|examples/.*|tests/securityselinuxhelper.c)$$
exclude_file_name_regexp--sc_prohibit_readlink = \
^src/(util/virutil|lxc/lxc_container)\.c$$

2
configure.ac
View File

@ -143,6 +143,7 @@ AC_MSG_RESULT([$VERSION_SCRIPT_FLAGS])
LIBVIRT_COMPILE_WARNINGS
LIBVIRT_CHECK_APPARMOR
LIBVIRT_CHECK_ATTR
LIBVIRT_CHECK_AUDIT
LIBVIRT_CHECK_AVAHI
LIBVIRT_CHECK_BLKID
@ -2467,6 +2468,7 @@ AC_MSG_NOTICE([])
AC_MSG_NOTICE([Libraries])
AC_MSG_NOTICE([])
LIBVIRT_RESULT_APPARMOR
LIBVIRT_RESULT_ATTR
LIBVIRT_RESULT_AUDIT
LIBVIRT_RESULT_AVAHI
LIBVIRT_RESULT_BLKID

1
libvirt.spec.in
View File

@ -410,6 +410,7 @@ BuildRequires: ncurses-devel
BuildRequires: gettext
BuildRequires: libtasn1-devel
BuildRequires: gnutls-devel
BuildRequires: libattr-devel
%if 0%{?fedora} >= 12 || 0%{?rhel} >= 6
# for augparse, optionally used in testing
BuildRequires: augeas

9
m4/virt-attr.m4 Normal file
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@ -0,0 +1,9 @@
dnl The libattr.so library
AC_DEFUN([LIBVIRT_CHECK_ATTR],[
LIBVIRT_CHECK_LIB([ATTR], [attr], [getxattr], [attr/xattr.h])
])
AC_DEFUN([LIBVIRT_RESULT_ATTR],[
LIBVIRT_RESULT_LIB([ATTR])
])

20
tests/Makefile.am
View File

@ -68,6 +68,7 @@ EXTRA_DIST = \
qemuxml2argvdata \
qemuxml2xmloutdata \
qemuxmlnsdata \
securityselinuxlabeldata \
schematestutils.sh \
sexpr2xmldata \
storagepoolschematest \
@ -106,6 +107,9 @@ endif
if WITH_SECDRIVER_SELINUX
test_programs += securityselinuxtest
if WITH_ATTR
test_programs += securityselinuxlabeltest
endif
endif
if WITH_DRIVER_MODULES
@ -597,10 +601,20 @@ securityselinuxtest_SOURCES = \
securityselinuxtest.c testutils.h testutils.c
securityselinuxtest_CFLAGS = -Dabs_builddir="\"$(abs_builddir)\"" $(AM_CFLAGS)
securityselinuxtest_LDADD = $(LDADDS)
securityselinuxtest_DEPENDENCIES = libsecurityselinuxhelper.la
else
EXTRA_DIST += securityselinuxtest.c securityselinuxhelper.c
securityselinuxtest_DEPENDENCIES = libsecurityselinuxhelper.la ../src/libvirt.la
if WITH_QEMU
if WITH_ATTR
securityselinuxlabeltest_SOURCES = \
securityselinuxlabeltest.c testutils.h testutils.c \
testutilsqemu.h testutilsqemu.c
securityselinuxlabeltest_CFLAGS = -Dabs_builddir="\"$(abs_builddir)\"" $(AM_CFLAGS)
securityselinuxlabeltest_LDADD = $(qemu_LDADDS)
securityselinuxlabeltest_DEPENDENCIES = libsecurityselinuxhelper.la ../src/libvirt.la
endif
endif
endif
EXTRA_DIST += securityselinuxtest.c securityselinuxlabeltest.c securityselinuxhelper.c
virbuftest_SOURCES = \
virbuftest.c testutils.h testutils.c

33
tests/securityselinuxhelper.c
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@ -24,6 +24,9 @@
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <attr/xattr.h>
/*
* The kernel policy will not allow us to arbitrarily change
* test process context. This helper is used as an LD_PRELOAD
@ -64,3 +67,33 @@ int setcon_raw(security_context_t context)
{
return setenv("FAKE_CONTEXT", context, 1);
}
#if WITH_ATTR
int setfilecon(const char *path, security_context_t con)
{
const char *constr = con;
return setxattr(path, "user.libvirt.selinux",
constr, strlen(constr), 0);
}
int getfilecon(const char *path, security_context_t *con)
{
char *constr = NULL;
ssize_t len = getxattr(path, "user.libvirt.selinux",
NULL, 0);
if (len < 0)
return -1;
if (!(constr = malloc(len+1)))
return -1;
memset(constr, 0, len);
if (getxattr(path, "user.libvirt.selinux", constr, len) < 0) {
free(constr);
return -1;
}
*con = constr;
constr[len] = '\0';
return 0;
}
#endif

7
tests/securityselinuxlabeldata/chardev.txt Normal file
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@ -0,0 +1,7 @@
/plain.txt;system_u:object_r:svirt_image_t:s0:c41,c264
/plain.dev;system_u:object_r:svirt_image_t:s0:c41,c264
/plain.fifo;system_u:object_r:svirt_image_t:s0:c41,c264
/nolabel.sock;
/plain.sock;
/yeslabel.sock;system_u:object_r:svirt_image_t:s0:c41,c264
/altlabel.sock;system_u:object_r:svirt_image_custom_t:s0:c41,c264

47
tests/securityselinuxlabeldata/chardev.xml Normal file
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@ -0,0 +1,47 @@
<domain type='kvm'>
<name>vm1</name>
<uuid>c7b3edbd-edaf-9455-926a-d65c16db1800</uuid>
<memory unit='KiB'>219200</memory>
<os>
<type arch='i686' machine='pc-1.0'>hvm</type>
<boot dev='cdrom'/>
</os>
<devices>
<serial type='file'>
<source path='/plain.txt'/>
</serial>
<serial type='pipe'>
<source path='/plain.fifo'/>
</serial>
<serial type='dev'>
<source path='/plain.dev'/>
</serial>
<serial type='unix'>
<source mode='bind' path='/plain.sock'/>
</serial>
<serial type='unix'>
<source mode='connect' path='/nolabel.sock'>
<seclabel relabel='no' model='selinux'/>
</source>
</serial>
<serial type='unix'>
<source mode='connect' path='/yeslabel.sock'>
</source>
</serial>
<serial type='unix'>
<source mode='connect' path='/altlabel.sock'>
<seclabel relabel='yes' model='selinux'>
<label>system_u:object_r:svirt_image_custom_t:s0:c41,c264</label>
</seclabel>
</source>
</serial>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
</devices>
<seclabel model="selinux" type="dynamic" relabel="yes">
<label>system_u:system_r:svirt_t:s0:c41,c264</label>
<imagelabel>system_u:object_r:svirt_image_t:s0:c41,c264</imagelabel>
</seclabel>
</domain>

5
tests/securityselinuxlabeldata/disks.txt Normal file
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@ -0,0 +1,5 @@
/plain.raw;system_u:object_r:svirt_image_t:s0:c41,c264
/shared.raw;system_u:object_r:svirt_image_t:s0
/readonly.raw;system_u:object_r:virt_content_t:s0
/nolabel.raw;
/altlabel.raw;system_u:object_r:svirt_image_custom_t:s0:c41,c264

52
tests/securityselinuxlabeldata/disks.xml Normal file
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@ -0,0 +1,52 @@
<domain type='kvm'>
<name>vm1</name>
<uuid>c7b3edbd-edaf-9455-926a-d65c16db1800</uuid>
<memory unit='KiB'>219200</memory>
<os>
<type arch='i686' machine='pc-1.0'>hvm</type>
<boot dev='cdrom'/>
</os>
<devices>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/plain.raw'/>
<target dev='vda' bus='virtio'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/shared.raw'/>
<shareable/>
<target dev='vdb' bus='virtio'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/readonly.raw'/>
<readonly/>
<target dev='vdc' bus='virtio'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/nolabel.raw'>
<seclabel model='selinux' relabel='no'/>
</source>
<target dev='vdd' bus='virtio'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/altlabel.raw'>
<seclabel model='selinux' relabel='yes'>
<label>system_u:object_r:svirt_image_custom_t:s0:c41,c264</label>
</seclabel>
</source>
<target dev='vde' bus='virtio'/>
</disk>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
</devices>
<seclabel model="selinux" type="dynamic" relabel="yes">
<label>system_u:system_r:svirt_t:s0:c41,c264</label>
<imagelabel>system_u:object_r:svirt_image_t:s0:c41,c264</imagelabel>
</seclabel>
</domain>

2
tests/securityselinuxlabeldata/kernel.txt Normal file
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@ -0,0 +1,2 @@
/vmlinuz.raw;system_u:object_r:virt_content_t:s0
/initrd.raw;system_u:object_r:virt_content_t:s0

20
tests/securityselinuxlabeldata/kernel.xml Normal file
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@ -0,0 +1,20 @@
<domain type='kvm'>
<name>vm1</name>
<uuid>c7b3edbd-edaf-9455-926a-d65c16db1800</uuid>
<memory unit='KiB'>219200</memory>
<os>
<type arch='i686' machine='pc-1.0'>hvm</type>
<kernel>/vmlinuz.raw</kernel>
<initrd>/initrd.raw</initrd>
</os>
<devices>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
</devices>
<seclabel model="selinux" type="dynamic" relabel="yes">
<label>system_u:system_r:svirt_t:s0:c41,c264</label>
<imagelabel>system_u:object_r:svirt_image_t:s0:c41,c264</imagelabel>
</seclabel>
</domain>

339
tests/securityselinuxlabeltest.c Normal file
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@ -0,0 +1,339 @@
/*
* Copyright (C) 2011-2012 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 "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 "virutil.h"
#include "security/security_manager.h"
#define VIR_FROM_THIS VIR_FROM_NONE
static virCapsPtr caps;
static virSecurityManagerPtr mgr;
typedef struct testSELinuxFile testSELinuxFile;
struct testSELinuxFile {
char *file;
char *context;
};
static int
testSELinuxMungePath(char **path)
{
char *tmp;
if (virAsprintf(&tmp, "%s/securityselinuxlabeldata%s",
abs_srcdir, *path) < 0) {
virReportOOMError();
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;
*files = NULL;
*nfiles = 0;
if (virAsprintf(&path, "%s/securityselinuxlabeldata/%s.txt",
abs_srcdir, testname) < 0) {
virReportOOMError();
goto cleanup;
}
if (!(fp = fopen(path, "r"))) {
goto cleanup;
}
while (!feof(fp)) {
char *line;
char *file, *context;
if (VIR_ALLOC_N(line, 1024) < 0) {
virReportOOMError();
goto cleanup;
}
if (!fgets(line, 1024, fp)) {
if (!feof(fp))
goto cleanup;
break;
}
char *tmp = strchr(line, ';');
*tmp = '\0';
tmp++;
if (virAsprintf(&file, "%s/securityselinuxlabeldata%s", abs_builddir, line) < 0) {
VIR_FREE(line);
virReportOOMError();
goto cleanup;
}
if (*tmp != '\0' && *tmp != '\n') {
if (!(context = strdup(tmp))) {
VIR_FREE(line);
VIR_FREE(file);
virReportOOMError();
goto cleanup;
}
tmp = strchr(context, '\n');
*tmp = '\0';
} else {
context = NULL;
}
if (VIR_EXPAND_N(*files, *nfiles, 1) < 0) {
virReportOOMError();
goto cleanup;
}
(*files)[(*nfiles)-1].file = file;
(*files)[(*nfiles)-1].context = context;
}
ret = 0;
cleanup:
VIR_FORCE_FCLOSE(fp);
VIR_FREE(path);
return ret;
}
static virDomainDefPtr
testSELinuxLoadDef(const char *testname)
{
char *xmlfile = NULL;
char *xmlstr = NULL;
virDomainDefPtr def = NULL;
size_t i;
if (virAsprintf(&xmlfile, "%s/securityselinuxlabeldata/%s.xml",
abs_srcdir, testname) < 0) {
virReportOOMError();
goto cleanup;
}
if (virFileReadAll(xmlfile, 1024*1024, &xmlstr) < 0) {
goto cleanup;
}
if (!(def = virDomainDefParseString(caps, xmlstr,
QEMU_EXPECTED_VIRT_TYPES,
0)))
goto cleanup;
for (i = 0 ; i < def->ndisks ; i++) {
if (def->disks[i]->type != VIR_DOMAIN_DISK_TYPE_FILE &&
def->disks[i]->type != VIR_DOMAIN_DISK_TYPE_BLOCK)
continue;
if (testSELinuxMungePath(&def->disks[i]->src) < 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);
VIR_FREE(xmlstr);
return def;
}
static int
testSELinuxCreateDisks(testSELinuxFile *files, size_t nfiles)
{
size_t i;
if (virFileMakePath(abs_builddir "/securityselinuxlabeldata") < 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;
}
return 0;
}
static int
testSELinuxCheckLabels(testSELinuxFile *files, size_t nfiles)
{
size_t i;
security_context_t ctx;
for (i = 0 ; i < nfiles ; i++) {
if (getfilecon(files[i].file, &ctx) < 0) {
if (errno == ENODATA) {
ctx = NULL;
} else {
virReportSystemError(errno,
"Cannot read label on %s",
files[i].file);
return -1;
}
}
if (!STREQ_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);
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;
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)
goto cleanup;
virDomainDefFree(def);
for (i = 0 ; i < nfiles; i++) {
VIR_FREE(files[i].file);
VIR_FREE(files[i].context);
}
VIR_FREE(files);
return ret;
}
static int
mymain(void)
{
int ret = 0;
if (!(mgr = virSecurityManagerNew("selinux", "QEMU", false, true, false))) {
virErrorPtr err = virGetLastError();
if (err->code == VIR_ERR_CONFIG_UNSUPPORTED)
exit(EXIT_AM_SKIP);
fprintf(stderr, "Unable to initialize security driver: %s\n",
err->message);
exit(EXIT_FAILURE);
}
if ((caps = testQemuCapsInit()) == NULL)
exit(EXIT_FAILURE);
#define DO_TEST_LABELING(name) \
if (virtTestRun("Labelling " # name, 1, 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");
return (ret == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
}
VIRT_TEST_MAIN_PRELOAD(mymain, abs_builddir "/.libs/libsecurityselinuxhelper.so")