-/*-*- 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
+ TORSEC group — http://security.polito.it
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
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 <unistd.h>
+#include "fd-util.h"
+#include "fileio.h"
#include "ima-setup.h"
-#include "mount-setup.h"
-#include "macro.h"
-#include "util.h"
#include "log.h"
-#include "label.h"
+#include "util.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;
- _cleanup_close_ int policyfd = -1, imafd = -1;
- int result = 0;
-
- 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 (result)
- return result;
-#endif /* HAVE_IMA */
-
- return 0;
+#if ENABLE_IMA
+ _cleanup_fclose_ FILE *input = NULL;
+ _cleanup_close_ int imafd = -1;
+ unsigned lineno = 0;
+ char line[page_size()];
+
+ if (access(IMA_SECFS_DIR, F_OK) < 0) {
+ log_debug("IMA support is disabled in the kernel, ignoring.");
+ return 0;
+ }
+
+ if (access(IMA_SECFS_POLICY, W_OK) < 0) {
+ log_warning("Another IMA custom policy has already been loaded, ignoring.");
+ return 0;
+ }
+
+ if (access(IMA_POLICY_PATH, F_OK) < 0) {
+ log_debug("No IMA custom policy file "IMA_POLICY_PATH", ignoring.");
+ return 0;
+ }
+
+ imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC);
+ if (imafd < 0) {
+ log_error_errno(errno, "Failed to open the IMA kernel interface "IMA_SECFS_POLICY", ignoring: %m");
+ return 0;
+ }
+
+ /* attempt to write the name of the policy file into sysfs file */
+ if (write(imafd, IMA_POLICY_PATH, strlen(IMA_POLICY_PATH)) > 0)
+ goto done;
+
+ /* fall back to copying the policy line-by-line */
+ input = fopen(IMA_POLICY_PATH, "re");
+ if (!input) {
+ log_warning_errno(errno, "Failed to open the IMA custom policy file "IMA_POLICY_PATH", ignoring: %m");
+ return 0;
+ }
+
+ close(imafd);
+
+ imafd = open(IMA_SECFS_POLICY, O_WRONLY|O_CLOEXEC);
+ if (imafd < 0) {
+ log_error_errno(errno, "Failed to open the IMA kernel interface "IMA_SECFS_POLICY", ignoring: %m");
+ return 0;
+ }
+
+ FOREACH_LINE(line, input,
+ return log_error_errno(errno, "Failed to read the IMA custom policy file "IMA_POLICY_PATH": %m")) {
+ size_t len;
+
+ len = strlen(line);
+ lineno++;
+
+ if (len > 0 && write(imafd, line, len) < 0)
+ return log_error_errno(errno, "Failed to load the IMA custom policy file "IMA_POLICY_PATH"%u: %m",
+ lineno);
+ }
+
+done:
+ log_info("Successfully loaded the IMA custom policy "IMA_POLICY_PATH".");
+#endif /* ENABLE_IMA */
+ return 0;
}