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The linux/magic.h header has existed since commit e18fa700c9a31360bc8f193aa543b7ef7b39a06b Author: Jeff Garzik <jeff@garzik.org> Date: Sun Sep 24 11:13:19 2006 -0400 Move several *_SUPER_MAGIC symbols to include/linux/magic.h. This is old enough that all our supported platforms can be assumed to have this header. Reviewed-by: Ján Tomko <jtomko@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
320 lines
7.7 KiB
C
320 lines
7.7 KiB
C
/*
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* Copyright (C) 2011-2013, 2016 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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/* This file is only compiled on Linux, and only if xattr support was
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* detected. */
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#include "virmock.h"
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#include <linux/magic.h>
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#include <selinux/selinux.h>
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#include <selinux/label.h>
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#include <sys/vfs.h>
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#include <unistd.h>
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#include <sys/xattr.h>
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#ifndef NFS_SUPER_MAGIC
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# define NFS_SUPER_MAGIC 0x6969
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#endif
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#define VIR_FROM_THIS VIR_FROM_NONE
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#include "viralloc.h"
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static int (*real_statfs)(const char *path, struct statfs *buf);
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static int (*real_security_get_boolean_active)(const char *name);
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static int (*real_is_selinux_enabled)(void);
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static const char *(*real_selinux_virtual_domain_context_path)(void);
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static const char *(*real_selinux_virtual_image_context_path)(void);
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static const char *(*real_selinux_lxc_contexts_path)(void);
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static struct selabel_handle *(*real_selabel_open)(unsigned int backend,
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const struct selinux_opt *opts,
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unsigned nopts);
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static void (*real_selabel_close)(struct selabel_handle *handle);
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static int (*real_selabel_lookup_raw)(struct selabel_handle *handle,
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char **con,
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const char *key,
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int type);
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static void init_syms(void)
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{
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if (real_statfs)
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return;
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VIR_MOCK_REAL_INIT(statfs);
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VIR_MOCK_REAL_INIT(security_get_boolean_active);
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VIR_MOCK_REAL_INIT(is_selinux_enabled);
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VIR_MOCK_REAL_INIT(selinux_virtual_domain_context_path);
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VIR_MOCK_REAL_INIT(selinux_virtual_image_context_path);
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VIR_MOCK_REAL_INIT(selinux_lxc_contexts_path);
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VIR_MOCK_REAL_INIT(selabel_open);
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VIR_MOCK_REAL_INIT(selabel_close);
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VIR_MOCK_REAL_INIT(selabel_lookup_raw);
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}
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/*
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* The kernel policy will not allow us to arbitrarily change
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* test process context. This helper is used as an LD_PRELOAD
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* so that the libvirt code /thinks/ it is changing/reading
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* the process context, whereas in fact we're faking it all.
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* Furthermore, we fake out that we are using an nfs subdirectory,
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* where we control whether selinux is enforcing and whether
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* the virt_use_nfs bool is set.
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*/
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int getcon_raw(char **context)
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{
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if (!is_selinux_enabled()) {
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errno = EINVAL;
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return -1;
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}
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if (getenv("FAKE_SELINUX_CONTEXT") == NULL) {
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*context = NULL;
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errno = EINVAL;
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return -1;
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}
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*context = g_strdup(getenv("FAKE_SELINUX_CONTEXT"));
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return 0;
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}
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int getcon(char **context)
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{
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return getcon_raw(context);
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}
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int getpidcon_raw(pid_t pid, char **context)
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{
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if (!is_selinux_enabled()) {
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errno = EINVAL;
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return -1;
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}
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if (pid != getpid()) {
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*context = NULL;
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errno = ESRCH;
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return -1;
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}
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if (getenv("FAKE_SELINUX_CONTEXT") == NULL) {
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*context = NULL;
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errno = EINVAL;
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return -1;
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}
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*context = g_strdup(getenv("FAKE_SELINUX_CONTEXT"));
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return 0;
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}
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int getpidcon(pid_t pid, char **context)
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{
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return getpidcon_raw(pid, context);
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}
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int setcon_raw(const char *context)
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{
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if (!is_selinux_enabled()) {
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errno = EINVAL;
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return -1;
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}
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return g_setenv("FAKE_SELINUX_CONTEXT", context, TRUE) == TRUE ? 0 : -1;
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}
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int setcon(const char *context)
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{
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return setcon_raw(context);
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}
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int setfilecon_raw(const char *path, const char *con)
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{
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const char *constr = con;
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if (STRPREFIX(path, abs_builddir "/securityselinuxlabeldata/nfs/")) {
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errno = EOPNOTSUPP;
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return -1;
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}
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return setxattr(path, "user.libvirt.selinux",
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constr, strlen(constr), 0);
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}
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int setfilecon(const char *path, const char *con)
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{
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return setfilecon_raw(path, con);
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}
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int getfilecon_raw(const char *path, char **con)
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{
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char *constr = NULL;
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ssize_t len = getxattr(path, "user.libvirt.selinux",
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NULL, 0);
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if (STRPREFIX(path, abs_builddir "/securityselinuxlabeldata/nfs/")) {
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errno = EOPNOTSUPP;
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return -1;
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}
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if (len < 0)
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return -1;
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if (!(constr = malloc(len+1)))
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return -1;
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memset(constr, 0, len);
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if (getxattr(path, "user.libvirt.selinux", constr, len) < 0) {
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free(constr);
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return -1;
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}
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*con = constr;
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constr[len] = '\0';
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return 0;
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}
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int getfilecon(const char *path, char **con)
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{
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return getfilecon_raw(path, con);
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}
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int statfs(const char *path, struct statfs *buf)
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{
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int ret;
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init_syms();
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ret = real_statfs(path, buf);
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if (!ret && STREQ(path, abs_builddir "/securityselinuxlabeldata/nfs"))
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buf->f_type = NFS_SUPER_MAGIC;
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return ret;
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}
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int is_selinux_enabled(void)
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{
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return getenv("FAKE_SELINUX_DISABLED") == NULL;
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}
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int security_disable(void)
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{
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if (!is_selinux_enabled()) {
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errno = ENOENT;
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return -1;
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}
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return g_setenv("FAKE_SELINUX_DISABLED", "1", TRUE) == TRUE ? 0 : -1;
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}
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int security_getenforce(void)
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{
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if (!is_selinux_enabled()) {
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errno = ENOENT;
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return -1;
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}
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/* For the purpose of our test, we are enforcing. */
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return 1;
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}
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int security_get_boolean_active(const char *name)
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{
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if (!is_selinux_enabled()) {
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errno = ENOENT;
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return -1;
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}
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/* For the purpose of our test, nfs is not permitted. */
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if (STREQ(name, "virt_use_nfs"))
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return 0;
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init_syms();
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return real_security_get_boolean_active(name);
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}
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const char *selinux_virtual_domain_context_path(void)
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{
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init_syms();
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if (real_is_selinux_enabled())
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return real_selinux_virtual_domain_context_path();
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return abs_srcdir "/securityselinuxhelperdata/virtual_domain_context";
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}
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const char *selinux_virtual_image_context_path(void)
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{
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init_syms();
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if (real_is_selinux_enabled())
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return real_selinux_virtual_image_context_path();
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return abs_srcdir "/securityselinuxhelperdata/virtual_image_context";
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}
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const char *selinux_lxc_contexts_path(void)
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{
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init_syms();
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if (real_is_selinux_enabled())
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return real_selinux_lxc_contexts_path();
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return abs_srcdir "/securityselinuxhelperdata/lxc_contexts";
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}
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struct selabel_handle *
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selabel_open(unsigned int backend,
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const struct selinux_opt *opts,
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unsigned nopts)
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{
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char *fake_handle;
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init_syms();
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if (real_is_selinux_enabled())
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return real_selabel_open(backend, opts, nopts);
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/* struct selabel_handle is opaque; fake it */
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fake_handle = g_new0(char, 1);
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return (struct selabel_handle *)fake_handle;
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}
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void selabel_close(struct selabel_handle *handle)
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{
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init_syms();
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if (real_is_selinux_enabled())
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return real_selabel_close(handle);
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VIR_FREE(handle);
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}
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int selabel_lookup_raw(struct selabel_handle *handle,
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char **con,
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const char *key,
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int type)
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{
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init_syms();
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if (real_is_selinux_enabled())
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return real_selabel_lookup_raw(handle, con, key, type);
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/* Unimplemented */
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errno = ENOENT;
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return -1;
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}
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