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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
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 <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
#endif
#include "selinux-setup.h"
#include "selinux-util.h"
#include "label.h"
#include "mount-setup.h"
#include "macro.h"
#include "util.h"
#include "log.h"
#ifdef HAVE_SELINUX
static int null_log(int type, const char *fmt, ...) {
return 0;
}
#endif
int mac_selinux_setup(bool *loaded_policy) {
#ifdef HAVE_SELINUX
int enforce = 0;
usec_t before_load, after_load;
security_context_t con;
int r;
union selinux_callback cb;
bool initialized = false;
assert(loaded_policy);
/* Turn off all of SELinux' own logging, we want to do that */
cb.func_log = null_log;
selinux_set_callback(SELINUX_CB_LOG, cb);
/* Don't load policy in the initrd if we don't appear to have
* it. For the real root, we check below if we've already
* loaded policy, and return gracefully.
*/
if (in_initrd() && access(selinux_path(), F_OK) < 0)
return 0;
/* Already initialized by somebody else? */
r = getcon_raw(&con);
if (r == 0) {
initialized = !streq(con, "kernel");
freecon(con);
}
/* Make sure we have no fds open while loading the policy and
* transitioning */
log_close();
/* Now load the policy */
before_load = now(CLOCK_MONOTONIC);
r = selinux_init_load_policy(&enforce);
if (r == 0) {
char timespan[FORMAT_TIMESPAN_MAX];
char *label;
mac_selinux_retest();
/* Transition to the new context */
r = mac_selinux_get_create_label_from_exe(SYSTEMD_BINARY_PATH, &label);
if (r < 0 || label == NULL) {
log_open();
log_error("Failed to compute init label, ignoring.");
} else {
r = setcon(label);
log_open();
if (r < 0)
log_error("Failed to transition into init label '%s', ignoring.", label);
mac_selinux_free(label);
}
after_load = now(CLOCK_MONOTONIC);
log_info("Successfully loaded SELinux policy in %s.",
format_timespan(timespan, sizeof(timespan), after_load - before_load, 0));
*loaded_policy = true;
} else {
log_open();
if (enforce > 0) {
if (!initialized) {
log_emergency("Failed to load SELinux policy. Freezing.");
return -EIO;
}
log_warning("Failed to load new SELinux policy. Continuing with old policy.");
} else
log_debug("Unable to load SELinux policy. Ignoring.");
}
#endif
return 0;
}
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