5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
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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