99 lines
3 KiB
C
99 lines
3 KiB
C
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright (C) 2013 Intel Corporation
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Authors:
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Nathaniel Chen <nathaniel.chen@intel.com>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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systemd 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/vfs.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <sys/mount.h>
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#include <stdint.h>
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#include "macro.h"
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#include "smack-setup.h"
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#include "util.h"
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#include "log.h"
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#include "label.h"
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#define ACCESSES_D_PATH "/etc/smack/accesses.d/"
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int smack_setup(void) {
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_cleanup_fclose_ FILE *smack = NULL;
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *entry;
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char buf[NAME_MAX];
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int dfd = -1;
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smack = fopen("/sys/fs/smackfs/load2", "we");
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if (!smack) {
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log_info("Smack is not enabled in the kernel, not loading access rules.");
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return 0;
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}
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/* write rules to load2 from every file in the directory */
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dir = opendir(ACCESSES_D_PATH);
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if (!dir) {
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log_info("Smack access rules directory not found: " ACCESSES_D_PATH);
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return 0;
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}
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dfd = dirfd(dir);
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if (dfd < 0) {
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log_error("Smack access rules directory " ACCESSES_D_PATH " not opened: %m");
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return 0;
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}
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FOREACH_DIRENT(entry, dir, return 0) {
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_cleanup_fclose_ FILE *policy = NULL;
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_cleanup_close_ int pol = -1;
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pol = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
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if (pol < 0) {
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log_error("Smack access rule file %s not opened: %m", entry->d_name);
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continue;
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}
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policy = fdopen(pol, "re");
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if (!policy) {
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log_error("Smack access rule file %s not opened: %m", entry->d_name);
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continue;
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}
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pol = -1;
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/* load2 write rules in the kernel require a line buffered stream */
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FOREACH_LINE(buf, policy, log_error("Failed to read from Smack access rule file %s: %m", entry->d_name)) {
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fputs(buf, smack);
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fflush(smack);
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}
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}
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log_info("Successfully loaded Smack policies.");
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return 0;
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}
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