99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
/***
|
|
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 Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
|
|
#include "fd-util.h"
|
|
#include "fileio.h"
|
|
#include "ima-setup.h"
|
|
#include "log.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) {
|
|
#if HAVE_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 /* HAVE_IMA */
|
|
return 0;
|
|
}
|