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eb8b496e89
The current code will label the target of a symlink rather than the link itself. This means that the link does not get it's context set and the target gets the wrong context. Incidentally this affects the labelling of hard disk device nodes and can get in the way of booting. Also get_media() should not be called with devname==NULL.
171 lines
3.6 KiB
C
171 lines
3.6 KiB
C
/*
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* Copyright (C) 2004 Daniel Walsh
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <limits.h>
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#include <libgen.h>
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#include <errno.h>
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#include <selinux/selinux.h>
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#include "udev.h"
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#include "udev_selinux.h"
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static security_context_t prev_scontext = NULL;
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static int is_selinux_running(void)
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{
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static int selinux_enabled = -1;
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if (selinux_enabled == -1)
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selinux_enabled = (is_selinux_enabled() > 0);
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dbg("selinux=%i", selinux_enabled);
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return selinux_enabled;
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}
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static char *get_media(const char *devname, int mode)
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{
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FILE *fp;
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char procfile[PATH_MAX];
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char mediabuf[256];
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int size;
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char *media = NULL;
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if (!(mode & S_IFBLK))
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return NULL;
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snprintf(procfile, PATH_MAX, "/proc/ide/%s/media", devname);
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procfile[PATH_MAX-1] = '\0';
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fp = fopen(procfile, "r");
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if (!fp)
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goto out;
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if (fgets(mediabuf, sizeof(mediabuf), fp) == NULL)
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goto close_out;
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size = strlen(mediabuf);
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while (size-- > 0) {
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if (isspace(mediabuf[size])) {
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mediabuf[size] = '\0';
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} else {
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break;
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}
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}
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media = strdup(mediabuf);
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info("selinux_get_media(%s)='%s'\n", devname, media);
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close_out:
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fclose(fp);
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out:
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return media;
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}
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void selinux_setfilecon(const char *file, const char *devname, unsigned int mode)
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{
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if (is_selinux_running()) {
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security_context_t scontext = NULL;
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char *media;
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int ret = -1;
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if(devname)
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{
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media = get_media(devname, mode);
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if (media) {
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ret = matchmediacon(media, &scontext);
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free(media);
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}
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}
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if (ret < 0)
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if (matchpathcon(file, mode, &scontext) < 0) {
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err("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("setfilecon %s failed: %s", file, strerror(errno));
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freecon(scontext);
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}
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}
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void selinux_setfscreatecon(const char *file, const char *devname, unsigned int mode)
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{
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if (is_selinux_running()) {
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security_context_t scontext = NULL;
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char *media;
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int ret = -1;
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media = get_media(devname, mode);
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if (media) {
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ret = matchmediacon(media, &scontext);
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free(media);
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}
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if (ret < 0)
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if (matchpathcon(file, mode, &scontext) < 0) {
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err("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("setfscreatecon %s failed: %s", file, strerror(errno));
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freecon(scontext);
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}
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}
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void selinux_resetfscreatecon(void)
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{
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if (is_selinux_running()) {
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if (setfscreatecon(prev_scontext) < 0)
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err("setfscreatecon failed: %s", strerror(errno));
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}
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}
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void selinux_init(void)
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{
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/*
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* record the present security context, for file-creation
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* restoration creation purposes.
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*/
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if (is_selinux_running()) {
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matchpathcon_init_prefix(NULL, udev_root);
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if (getfscreatecon(&prev_scontext) < 0) {
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err("getfscreatecon failed\n");
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prev_scontext = NULL;
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}
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}
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}
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void selinux_exit(void)
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{
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if (is_selinux_running() && prev_scontext) {
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freecon(prev_scontext);
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prev_scontext = NULL;
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}
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}
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