mirror of
https://github.com/systemd/systemd.git
synced 2024-11-06 16:59:03 +03:00
116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||
|
|
|
||
|
|
/***
|
||
|
|
This file is part of systemd.
|
||
|
|
|
||
|
|
Copyright 2010 Lennart Poettering
|
||
|
|
Copyright (C) 2012 Roberto Sassu - Politecnico di Torino, Italy
|
||
|
|
TORSEC group -- http://security.polito.it
|
||
|
|
|
||
|
|
systemd is free software; you can redistribute it and/or modify it
|
||
|
|
under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 2 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
|
||
|
|
General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
***/
|
||
|
|
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <sys/mman.h>
|
||
|
|
|
||
|
|
#include "ima-setup.h"
|
||
|
|
#include "mount-setup.h"
|
||
|
|
#include "macro.h"
|
||
|
|
#include "util.h"
|
||
|
|
#include "log.h"
|
||
|
|
#include "label.h"
|
||
|
|
|
||
|
|
#define IMA_SECFS_DIR "/sys/kernel/security/ima"
|
||
|
|
#define IMA_SECFS_POLICY IMA_SECFS_DIR "/policy"
|
||
|
|
#define IMA_POLICY_PATH "/etc/ima/ima-policy"
|
||
|
|
|
||
|
|
int ima_setup(void) {
|
||
|
|
|
||
|
|
#ifdef HAVE_IMA
|
||
|
|
struct stat st;
|
||
|
|
ssize_t policy_size = 0, written = 0;
|
||
|
|
char *policy;
|
||
|
|
int policyfd = -1, imafd = -1;
|
||
|
|
int result = 0;
|
||
|
|
|
||
|
|
#ifndef HAVE_SELINUX
|
||
|
|
/* Mount the securityfs filesystem */
|
||
|
|
mount_setup_early();
|
||
|
|
#endif
|
||
|
|
|
||
|
|
if (stat(IMA_POLICY_PATH, &st) < 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
policy_size = st.st_size;
|
||
|
|
if (stat(IMA_SECFS_DIR, &st) < 0) {
|
||
|
|
log_debug("IMA support is disabled in the kernel, ignoring.");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (stat(IMA_SECFS_POLICY, &st) < 0) {
|
||
|
|
log_error("Another IMA custom policy has already been loaded, "
|
||
|
|
"ignoring.");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
policyfd = open(IMA_POLICY_PATH, O_RDONLY|O_CLOEXEC);
|
||
|
|
if (policyfd < 0) {
|
||
|
|
log_error("Failed to open the IMA custom policy file %s (%m), "
|
||
|
|
"ignoring.", IMA_POLICY_PATH);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC);
|
||
|
|
if (imafd < 0) {
|
||
|
|
log_error("Failed to open the IMA kernel interface %s (%m), "
|
||
|
|
"ignoring.", IMA_SECFS_POLICY);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
policy = mmap(NULL, policy_size, PROT_READ, MAP_PRIVATE, policyfd, 0);
|
||
|
|
if (policy == MAP_FAILED) {
|
||
|
|
log_error("mmap() failed (%m), freezing");
|
||
|
|
result = -errno;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
written = loop_write(imafd, policy, (size_t)policy_size, false);
|
||
|
|
if (written != policy_size) {
|
||
|
|
log_error("Failed to load the IMA custom policy file %s (%m), "
|
||
|
|
"ignoring.", IMA_POLICY_PATH);
|
||
|
|
goto out_mmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
log_info("Successfully loaded the IMA custom policy %s.",
|
||
|
|
IMA_POLICY_PATH);
|
||
|
|
out_mmap:
|
||
|
|
munmap(policy, policy_size);
|
||
|
|
out:
|
||
|
|
if (policyfd >= 0)
|
||
|
|
close_nointr_nofail(policyfd);
|
||
|
|
if (imafd >= 0)
|
||
|
|
close_nointr_nofail(imafd);
|
||
|
|
if (result)
|
||
|
|
return result;
|
||
|
|
#endif /* HAVE_IMA */
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|