freebsd-skq/lib/libveriexec/veriexec_check.c

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/*
* $FreeBSD$
*
* Copyright (c) 2011, 2012, 2013, 2015, Juniper Networks, Inc.
* All rights reserved.
*
* 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 ``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 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 <sys/cdefs.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/mac.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <paths.h>
#include <security/mac_veriexec/mac_veriexec.h>
#include "libveriexec.h"
static int
check_fd_mode(int fd, unsigned int mask)
{
struct stat st;
if (fstat(fd, &st) < 0)
return errno;
if ((st.st_mode & mask) == 0)
return EAUTH;
return 0;
}
int
veriexec_check_fd_mode(int fd, unsigned int mask)
{
int error;
if (fd < 0) {
errno = EINVAL;
return -1;
}
error = mac_syscall(MAC_VERIEXEC_NAME, MAC_VERIEXEC_CHECK_FD_SYSCALL,
(void *)(intptr_t)fd);
if (error == -1) {
switch (errno) {
case ENOSYS: /* veriexec not loaded */
error = 0; /* ignore */
break;
}
}
if (mask && error == 0)
error = check_fd_mode(fd, mask);
return (error);
}
int
veriexec_check_path_mode(const char *file, unsigned int mask)
{
int error;
if (!file) {
errno = EINVAL;
return -1;
}
if (mask) {
int fd;
if ((fd = open(file, O_RDONLY)) < 0)
return errno;
error = veriexec_check_fd_mode(fd, mask);
close(fd);
return error;
}
error = mac_syscall(MAC_VERIEXEC_NAME, MAC_VERIEXEC_CHECK_PATH_SYSCALL,
__DECONST(void *, file));
if (error == -1) {
switch (errno) {
case ENOSYS: /* veriexec not loaded */
error = 0; /* ignore */
break;
}
}
return (error);
}
int
veriexec_check_fd(int fd)
{
return veriexec_check_fd_mode(fd, 0);
}
int
veriexec_check_path(const char *file)
{
return veriexec_check_path_mode(file, 0);
}
#if defined(MAIN) || defined(UNIT_TEST)
int
main(int argc __unused, char *argv[] __unused)
{
int error;
int rc = 0;
while (*++argv) {
error = veriexec_check_path(*argv);
if (error == -1) {
rc = 1;
warn("%s", *argv);
}
}
exit(rc);
}
#endif