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/*
rc-selinux.c
SELinux helpers to get and set contexts.
*/
/*
* Copyright (c) 2014 Jason Zaman <jason@perfinion.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stddef.h>
#include <errno.h>
#include <dlfcn.h>
#include <sys/stat.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
#include "einfo.h"
#include "queue.h"
#include "rc.h"
#include "rc-misc.h"
#include "rc-plugin.h"
#include "rc-selinux.h"
#define SELINUX_LIB RC_LIBDIR "/runscript_selinux.so"
static void (*selinux_run_init_old) (void);
static void (*selinux_run_init_new) (int argc, char **argv);
static struct selabel_handle *hnd = NULL;
int selinux_util_label(const char *path)
{
int retval = 0;
int enforce;
struct stat st;
security_context_t con;
enforce = security_getenforce();
if (retval < 0)
return retval;
if (!hnd)
return (enforce) ? -1 : 0;
retval = lstat(path, &st);
if (retval < 0) {
if (errno == ENOENT)
return 0;
return (enforce) ? -1 : 0;
}
/* lookup the context */
retval = selabel_lookup_raw(hnd, &con, path, st.st_mode);
if (retval < 0) {
if (errno == ENOENT)
return 0;
return (enforce) ? -1 : 0;
}
/* apply the context */
retval = lsetfilecon(path, con);
freecon(con);
if (retval < 0) {
if (errno == ENOENT)
return 0;
if (errno == ENOTSUP)
return 0;
return (enforce) ? -1 : 0;
}
return 0;
}
/*
* Open the label handle
* returns 1 on success, 0 if no selinux, negative on error
*/
int selinux_util_open(void)
{
int retval = 0;
retval = is_selinux_enabled();
if (retval <= 0)
return retval;
hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
if (!hnd)
return -2;
return 1;
}
/*
* Close the label handle
* returns 1 on success, 0 if no selinux, negative on error
*/
int selinux_util_close(void)
{
int retval = 0;
retval = is_selinux_enabled();
if (retval <= 0)
return retval;
if (hnd) {
selabel_close(hnd);
hnd = NULL;
}
return 0;
}
void selinux_setup(int argc, char **argv)
{
void *lib_handle = NULL;
if (!exists(SELINUX_LIB))
return;
lib_handle = dlopen(SELINUX_LIB, RTLD_NOW | RTLD_GLOBAL);
if (!lib_handle) {
eerror("dlopen: %s", dlerror());
return;
}
selinux_run_init_old = (void (*)(void))
dlfunc(lib_handle, "selinux_runscript");
selinux_run_init_new = (void (*)(int, char **))
dlfunc(lib_handle, "selinux_runscript2");
/* Use new run_init if it exists, else fall back to old */
if (selinux_run_init_new)
selinux_run_init_new(argc, argv);
else if (selinux_run_init_old)
selinux_run_init_old();
else
/* This shouldnt happen... probably corrupt lib */
eerrorx
("run_init is missing from runscript_selinux.so!");
dlclose(lib_handle);
}
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