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-rw-r--r--src/core/smack-setup.c98
1 files changed, 98 insertions, 0 deletions
diff --git a/src/core/smack-setup.c b/src/core/smack-setup.c
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+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2013 Intel Corporation
+ Authors:
+ Nathaniel Chen <nathaniel.chen@intel.com>
+
+ systemd 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.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/vfs.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <sys/mount.h>
+#include <stdint.h>
+
+#include "macro.h"
+#include "smack-setup.h"
+#include "util.h"
+#include "log.h"
+#include "label.h"
+
+#define ACCESSES_D_PATH "/etc/smack/accesses.d/"
+
+int smack_setup(void) {
+ _cleanup_fclose_ FILE *smack = NULL;
+ _cleanup_closedir_ DIR *dir = NULL;
+ struct dirent *entry;
+ char buf[NAME_MAX];
+ int dfd = -1;
+
+ smack = fopen("/sys/fs/smackfs/load2", "we");
+ if (!smack) {
+ log_info("Smack is not enabled in the kernel, not loading access rules.");
+ return 0;
+ }
+
+ /* write rules to load2 from every file in the directory */
+ dir = opendir(ACCESSES_D_PATH);
+ if (!dir) {
+ log_info("Smack access rules directory not found: " ACCESSES_D_PATH);
+ return 0;
+ }
+
+ dfd = dirfd(dir);
+ if (dfd < 0) {
+ log_error("Smack access rules directory " ACCESSES_D_PATH " not opened: %m");
+ return 0;
+ }
+
+ FOREACH_DIRENT(entry, dir, return 0) {
+ _cleanup_fclose_ FILE *policy = NULL;
+ _cleanup_close_ int pol = -1;
+
+ pol = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
+ if (pol < 0) {
+ log_error("Smack access rule file %s not opened: %m", entry->d_name);
+ continue;
+ }
+
+ policy = fdopen(pol, "re");
+ if (!policy) {
+ log_error("Smack access rule file %s not opened: %m", entry->d_name);
+ continue;
+ }
+
+ pol = -1;
+
+ /* load2 write rules in the kernel require a line buffered stream */
+ FOREACH_LINE(buf, policy, log_error("Failed to read from Smack access rule file %s: %m", entry->d_name)) {
+ fputs(buf, smack);
+ fflush(smack);
+ }
+ }
+
+ log_info("Successfully loaded Smack policies.");
+
+ return 0;
+}