116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*-*- 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 2010 Lennart Poettering
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Copyright (C) 2012 Roberto Sassu - Politecnico di Torino, Italy
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TORSEC group -- http://security.polito.it
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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 by
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the Free Software Foundation; either version 2.1 of the License, or
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(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 <unistd.h>
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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 <stdlib.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include "ima-setup.h"
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#include "mount-setup.h"
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#include "macro.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 IMA_SECFS_DIR "/sys/kernel/security/ima"
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#define IMA_SECFS_POLICY IMA_SECFS_DIR "/policy"
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#define IMA_POLICY_PATH "/etc/ima/ima-policy"
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int ima_setup(void) {
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#ifdef HAVE_IMA
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struct stat st;
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ssize_t policy_size = 0, written = 0;
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char *policy;
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int policyfd = -1, imafd = -1;
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int result = 0;
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#ifndef HAVE_SELINUX
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/* Mount the securityfs filesystem */
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mount_setup_early();
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#endif
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if (stat(IMA_POLICY_PATH, &st) < 0)
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return 0;
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policy_size = st.st_size;
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if (stat(IMA_SECFS_DIR, &st) < 0) {
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log_debug("IMA support is disabled in the kernel, ignoring.");
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return 0;
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}
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if (stat(IMA_SECFS_POLICY, &st) < 0) {
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log_error("Another IMA custom policy has already been loaded, "
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"ignoring.");
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return 0;
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}
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policyfd = open(IMA_POLICY_PATH, O_RDONLY|O_CLOEXEC);
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if (policyfd < 0) {
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log_error("Failed to open the IMA custom policy file %s (%m), "
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"ignoring.", IMA_POLICY_PATH);
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return 0;
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}
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imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC);
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if (imafd < 0) {
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log_error("Failed to open the IMA kernel interface %s (%m), "
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"ignoring.", IMA_SECFS_POLICY);
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goto out;
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}
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policy = mmap(NULL, policy_size, PROT_READ, MAP_PRIVATE, policyfd, 0);
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if (policy == MAP_FAILED) {
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log_error("mmap() failed (%m), freezing");
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result = -errno;
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goto out;
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}
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written = loop_write(imafd, policy, (size_t)policy_size, false);
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if (written != policy_size) {
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log_error("Failed to load the IMA custom policy file %s (%m), "
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"ignoring.", IMA_POLICY_PATH);
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goto out_mmap;
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}
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log_info("Successfully loaded the IMA custom policy %s.",
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IMA_POLICY_PATH);
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out_mmap:
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munmap(policy, policy_size);
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out:
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if (policyfd >= 0)
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close_nointr_nofail(policyfd);
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if (imafd >= 0)
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close_nointr_nofail(imafd);
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if (result)
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return result;
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#endif /* HAVE_IMA */
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return 0;
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}
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