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39db0d2dce
We are currently able to work only with non-translated SELinux
contexts, but we are using functions that work with translated
contexts throughout the code. This patch swaps all SELinux context
translation relative calls with their raw sisters to avoid parsing
problems.
The problems can be experienced with mcstrans for example. The
difference is that if you have translations enabled (yum install
mcstrans; service mcstrans start), fgetfilecon_raw() will get you
something like 'system_u:object_r:virt_image_t:s0', whereas
fgetfilecon() will return 'system_u:object_r:virt_image_t:SystemLow'
that we cannot parse.
I was trying to confirm that the _raw variants were here since the dawn of
time, but the only thing I see now is that it was imported together in
the upstream repo [1] from svn, so before 2008.
Thanks Laurent Bigonville for finding this out.
[1] http://oss.tresys.com/git/selinux.git
(cherry picked from commit 9674f2c637)
327 lines
9.7 KiB
C
327 lines
9.7 KiB
C
/*
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* Copyright (C) 2011-2012 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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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <selinux/selinux.h>
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#include <selinux/context.h>
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#include "internal.h"
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#include "testutils.h"
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#include "memory.h"
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#include "util.h"
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#include "logging.h"
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#include "virterror_internal.h"
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#include "security/security_manager.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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struct testSELinuxGenLabelData {
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virSecurityManagerPtr mgr;
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const char *pidcon;
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bool dynamic;
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const char *label;
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const char *baselabel;
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const char *user;
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const char *role;
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const char *imagerole;
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const char *type;
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const char *imagetype;
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int sensMin;
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int sensMax;
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int catMin;
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int catMax;
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};
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static virDomainDefPtr
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testBuildDomainDef(bool dynamic,
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const char *label,
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const char *baselabel)
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{
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virDomainDefPtr def;
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virSecurityLabelDefPtr secdef;
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if (VIR_ALLOC(def) < 0)
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goto no_memory;
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if (VIR_ALLOC_N(def->seclabels, 1) < 0)
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goto no_memory;
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if (VIR_ALLOC(secdef) < 0)
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goto no_memory;
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def->seclabels[0] = secdef;
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def->seclabels[0]->type = dynamic ? VIR_DOMAIN_SECLABEL_DYNAMIC : VIR_DOMAIN_SECLABEL_STATIC;
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if (label &&
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!(def->seclabels[0]->label = strdup(label)))
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goto no_memory;
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if (baselabel &&
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!(def->seclabels[0]->baselabel = strdup(baselabel)))
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goto no_memory;
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return def;
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no_memory:
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virReportOOMError();
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virDomainDefFree(def);
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return NULL;
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}
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static bool
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testSELinuxCheckCon(context_t con,
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const char *user,
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const char *role,
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const char *type,
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int sensMin,
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int sensMax ATTRIBUTE_UNUSED,
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int catMin,
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int catMax)
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{
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const char *range;
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char *tmp;
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int gotSens;
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int gotCatOne;
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int gotCatTwo;
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if (STRNEQ(context_user_get(con), user)) {
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fprintf(stderr, "Expect user %s got %s\n",
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user, context_user_get(con));
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return false;
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}
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if (STRNEQ(context_role_get(con), role)) {
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fprintf(stderr, "Expect role %s got %s\n",
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role, context_role_get(con));
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return false;
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}
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if (STRNEQ(context_type_get(con), type)) {
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fprintf(stderr, "Expect type %s got %s\n",
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type, context_type_get(con));
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return false;
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}
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range = context_range_get(con);
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if (range[0] != 's') {
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fprintf(stderr, "Malformed range %s, cannot find sensitivity\n",
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range);
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return false;
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}
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if (virStrToLong_i(range + 1, &tmp, 10, &gotSens) < 0 ||
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!tmp) {
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fprintf(stderr, "Malformed range %s, cannot parse sensitivity\n",
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range + 1);
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return false;
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}
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if (*tmp != ':') {
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fprintf(stderr, "Malformed range %s, too many sensitivity values\n",
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tmp);
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return false;
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}
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tmp++;
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if (*tmp != 'c') {
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fprintf(stderr, "Malformed range %s, cannot find first category\n",
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tmp);
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return false;
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}
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tmp++;
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if (virStrToLong_i(tmp, &tmp, 10, &gotCatOne) < 0) {
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fprintf(stderr, "Malformed range %s, cannot parse category one\n",
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tmp);
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return false;
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}
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if (tmp && *tmp == ',')
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tmp++;
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if (tmp && *tmp == 'c') {
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tmp++;
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if (virStrToLong_i(tmp, &tmp, 10, &gotCatTwo) < 0) {
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fprintf(stderr, "Malformed range %s, cannot parse category two\n",
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tmp);
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return false;
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}
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if (*tmp != '\0') {
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fprintf(stderr, "Malformed range %s, junk after second category\n",
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tmp);
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return false;
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}
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if (gotCatOne == gotCatTwo) {
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fprintf(stderr, "Saw category pair %d,%d where cats were equal\n",
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gotCatOne, gotCatTwo);
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return false;
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}
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} else {
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gotCatTwo = gotCatOne;
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}
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if (gotSens != sensMin) {
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fprintf(stderr, "Sensitivity %d is not equal to min %d\n",
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gotSens, sensMin);
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return false;
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}
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if (gotCatOne < catMin ||
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gotCatOne > catMax) {
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fprintf(stderr, "Category one %d is out of range %d-%d\n",
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gotCatTwo, catMin, catMax);
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return false;
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}
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if (gotCatTwo < catMin ||
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gotCatTwo > catMax) {
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fprintf(stderr, "Category two %d is out of range %d-%d\n",
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gotCatTwo, catMin, catMax);
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return false;
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}
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if (gotCatOne > gotCatTwo) {
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fprintf(stderr, "Category one %d is greater than category two %d\n",
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gotCatOne, gotCatTwo);
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return false;
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}
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return true;
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}
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static int
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testSELinuxGenLabel(const void *opaque)
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{
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const struct testSELinuxGenLabelData *data = opaque;
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int ret = -1;
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virDomainDefPtr def;
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context_t con = NULL;
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context_t imgcon = NULL;
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if (setcon_raw((security_context_t)data->pidcon) < 0) {
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perror("Cannot set process security context");
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return -1;
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}
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if (!(def = testBuildDomainDef(data->dynamic,
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data->label,
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data->baselabel)))
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goto cleanup;
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if (virSecurityManagerGenLabel(data->mgr, def) < 0) {
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virErrorPtr err = virGetLastError();
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fprintf(stderr, "Cannot generated label %s\n", err->message);
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goto cleanup;
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}
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VIR_DEBUG("label=%s imagelabel=%s",
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def->seclabels[0]->label, def->seclabels[0]->imagelabel);
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if (!(con = context_new(def->seclabels[0]->label)))
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goto cleanup;
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if (!(imgcon = context_new(def->seclabels[0]->imagelabel)))
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goto cleanup;
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if (!testSELinuxCheckCon(con,
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data->user, data->role, data->type,
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data->sensMin, data->sensMax,
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data->catMin, data->catMax))
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goto cleanup;
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if (!testSELinuxCheckCon(imgcon,
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data->user, data->imagerole, data->imagetype,
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data->sensMin, data->sensMax,
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data->catMin, data->catMax))
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goto cleanup;
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ret = 0;
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cleanup:
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context_free(con);
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context_free(imgcon);
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virDomainDefFree(def);
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return ret;
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}
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static int
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mymain(void)
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{
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int ret = 0;
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virSecurityManagerPtr mgr;
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if (!(mgr = virSecurityManagerNew("selinux", "QEMU", false, true, false))) {
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virErrorPtr err = virGetLastError();
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if (err->code == VIR_ERR_CONFIG_UNSUPPORTED)
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exit(EXIT_AM_SKIP);
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fprintf(stderr, "Unable to initialize security driver: %s\n",
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err->message);
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exit(EXIT_FAILURE);
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}
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#define DO_TEST_GEN_LABEL(desc, pidcon, \
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dynamic, label, baselabel, \
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user, role, imageRole, \
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type, imageType, \
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sensMin, sensMax, catMin, catMax) \
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do { \
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struct testSELinuxGenLabelData data = { \
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mgr, pidcon, dynamic, label, baselabel, \
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user, role, imageRole, type, imageType, \
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sensMin, sensMax, catMin, catMax \
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}; \
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if (virtTestRun("GenLabel " # desc, 1, testSELinuxGenLabel, &data) < 0) \
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ret = -1; \
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} while (0)
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DO_TEST_GEN_LABEL("dynamic unconfined, s0, c0.c1023",
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"unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023",
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true, NULL, NULL,
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"unconfined_u", "unconfined_r", "object_r",
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"svirt_t", "svirt_image_t",
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0, 0, 0, 1023);
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DO_TEST_GEN_LABEL("dynamic virtd, s0, c0.c1023",
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"system_u:system_r:virtd_t:s0-s0:c0.c1023",
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true, NULL, NULL,
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"system_u", "system_r", "object_r",
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"svirt_t", "svirt_image_t",
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0, 0, 0, 1023);
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DO_TEST_GEN_LABEL("dynamic virtd, s0, c0.c10",
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"system_u:system_r:virtd_t:s0-s0:c0.c10",
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true, NULL, NULL,
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"system_u", "system_r", "object_r",
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"svirt_t", "svirt_image_t",
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0, 0, 0, 10);
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DO_TEST_GEN_LABEL("dynamic virtd, s2-s3, c0.c1023",
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"system_u:system_r:virtd_t:s2-s3:c0.c1023",
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true, NULL, NULL,
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"system_u", "system_r", "object_r",
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"svirt_t", "svirt_image_t",
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2, 3, 0, 1023);
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return (ret == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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VIRT_TEST_MAIN_PRELOAD(mymain, abs_builddir "/.libs/libsecurityselinuxhelper.so")
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