udev / src / libudev-selinux-private.c

/*
 * 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);
        info(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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