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-rw-r--r--src/core/ima-setup.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/src/core/ima-setup.c b/src/core/ima-setup.c
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+/*-*- 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;
+}