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/*
* libudev - interface to udev device information
*
* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <unistd.h>
#include <selinux/selinux.h>
#include "libudev.h"
#include "libudev-private.h"
static int selinux_enabled;
security_context_t selinux_prev_scontext;
void udev_selinux_init(struct udev *udev)
{
/* record the present security context */
selinux_enabled = (is_selinux_enabled() > 0);
dbg(udev, "selinux=%i\n", selinux_enabled);
if (!selinux_enabled)
return;
matchpathcon_init_prefix(NULL, udev_get_dev_path(udev));
if (getfscreatecon(&selinux_prev_scontext) < 0) {
err(udev, "getfscreatecon failed\n");
selinux_prev_scontext = NULL;
}
}
void udev_selinux_exit(struct udev *udev)
{
if (!selinux_enabled)
return;
freecon(selinux_prev_scontext);
selinux_prev_scontext = NULL;
}
void udev_selinux_lsetfilecon(struct udev *udev, const char *file, unsigned int mode)
{
security_context_t scontext = NULL;
if (!selinux_enabled)
return;
if (matchpathcon(file, mode, &scontext) < 0) {
err(udev, "matchpathcon(%s) failed\n", file);
return;
}
if (lsetfilecon(file, scontext) < 0)
err(udev, "setfilecon %s failed: %m\n", file);
freecon(scontext);
}
void udev_selinux_setfscreatecon(struct udev *udev, const char *file, unsigned int mode)
{
security_context_t scontext = NULL;
if (!selinux_enabled)
return;
if (matchpathcon(file, mode, &scontext) < 0) {
err(udev, "matchpathcon(%s) failed\n", file);
return;
}
if (setfscreatecon(scontext) < 0)
err(udev, "setfscreatecon %s failed: %m\n", file);
freecon(scontext);
}
void udev_selinux_resetfscreatecon(struct udev *udev)
{
if (!selinux_enabled)
return;
if (setfscreatecon(selinux_prev_scontext) < 0)
err(udev, "setfscreatecon failed: %m\n");
}
void udev_selinux_setfscreateconat(struct udev *udev, int dfd, const char *file, unsigned int mode)
{
char filename[UTIL_PATH_SIZE];
if (!selinux_enabled)
return;
/* resolve relative filename */
if (file[0] != '/') {
char procfd[UTIL_PATH_SIZE];
char target[UTIL_PATH_SIZE];
ssize_t len;
snprintf(procfd, sizeof(procfd), "/proc/%u/fd/%u", getpid(), dfd);
len = readlink(procfd, target, sizeof(target));
if (len <= 0 || len == sizeof(target))
return;
target[len] = '\0';
util_strscpyl(filename, sizeof(filename), target, "/", file, NULL);
file = filename;
}
udev_selinux_setfscreatecon(udev, file, mode);
}
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