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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 SMACK_CONFIG "/etc/smack/accesses.d/"
static int write_rules(const char* dstpath, const char* srcdir) {
_cleanup_fclose_ FILE *dst = NULL;
_cleanup_closedir_ DIR *dir = NULL;
struct dirent *entry;
char buf[NAME_MAX];
int dfd = -1;
int r = 0;
dst = fopen(dstpath, "we");
if (!dst) {
if (errno != ENOENT)
log_warning("Failed to open %s: %m", dstpath);
return -errno; /* negative error */
}
/* write rules to dst from every file in the directory */
dir = opendir(srcdir);
if (!dir) {
if (errno != ENOENT)
log_warning("Failed to opendir %s: %m", srcdir);
return errno; /* positive on purpose */
}
dfd = dirfd(dir);
assert(dfd >= 0);
FOREACH_DIRENT(entry, dir, return 0) {
int fd;
_cleanup_fclose_ FILE *policy = NULL;
fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
if (fd < 0) {
if (r == 0)
r = -errno;
log_warning("Failed to open %s: %m", entry->d_name);
continue;
}
policy = fdopen(fd, "re");
if (!policy) {
if (r == 0)
r = -errno;
close_nointr_nofail(fd);
log_error("Failed to open %s: %m", entry->d_name);
continue;
}
/* load2 write rules in the kernel require a line buffered stream */
FOREACH_LINE(buf, policy,
log_error("Failed to read line from %s: %m",
entry->d_name)) {
if (!fputs(buf, dst)) {
if (r == 0)
r = -EINVAL;
log_error("Failed to write line to %s", dstpath);
break;
}
if (fflush(dst)) {
if (r == 0)
r = -errno;
log_error("Failed to flush writes to %s: %m", dstpath);
break;
}
}
}
return r;
}
int smack_setup(void) {
int r;
r = write_rules("/sys/fs/smackfs/load2", SMACK_CONFIG);
switch(r) {
case -ENOENT:
log_debug("Smack is not enabled in the kernel.");
return 0;
case ENOENT:
log_debug("Smack access rules directory " SMACK_CONFIG " not found");
return 0;
case 0:
log_info("Successfully loaded Smack policies.");
return 0;
default:
log_warning("Failed to load smack access rules: %s, ignoring.",
strerror(abs(r)));
return 0;
}
}
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