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