122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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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 <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#if HAVE_SELINUX
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#include <selinux/selinux.h>
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#endif
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#include "log.h"
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#include "macro.h"
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#include "selinux-setup.h"
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#include "selinux-util.h"
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#include "string-util.h"
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#include "util.h"
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#if HAVE_SELINUX
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_printf_(2,3)
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static int null_log(int type, const char *fmt, ...) {
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return 0;
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}
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#endif
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int mac_selinux_setup(bool *loaded_policy) {
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#if HAVE_SELINUX
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int enforce = 0;
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usec_t before_load, after_load;
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char *con;
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int r;
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union selinux_callback cb;
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bool initialized = false;
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assert(loaded_policy);
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/* Turn off all of SELinux' own logging, we want to do that */
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cb.func_log = null_log;
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selinux_set_callback(SELINUX_CB_LOG, cb);
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/* Don't load policy in the initrd if we don't appear to have
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* it. For the real root, we check below if we've already
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* loaded policy, and return gracefully.
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*/
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if (in_initrd() && access(selinux_path(), F_OK) < 0)
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return 0;
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/* Already initialized by somebody else? */
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r = getcon_raw(&con);
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if (r == 0) {
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initialized = !streq(con, "kernel");
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freecon(con);
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}
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/* Make sure we have no fds open while loading the policy and
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* transitioning */
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log_close();
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/* Now load the policy */
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before_load = now(CLOCK_MONOTONIC);
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r = selinux_init_load_policy(&enforce);
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if (r == 0) {
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_cleanup_(mac_selinux_freep) char *label = NULL;
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char timespan[FORMAT_TIMESPAN_MAX];
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mac_selinux_retest();
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/* Transition to the new context */
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r = mac_selinux_get_create_label_from_exe(SYSTEMD_BINARY_PATH, &label);
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if (r < 0 || !label) {
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log_open();
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log_error("Failed to compute init label, ignoring.");
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} else {
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r = setcon_raw(label);
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log_open();
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if (r < 0)
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log_error("Failed to transition into init label '%s', ignoring.", label);
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}
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after_load = now(CLOCK_MONOTONIC);
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log_info("Successfully loaded SELinux policy in %s.",
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format_timespan(timespan, sizeof(timespan), after_load - before_load, 0));
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*loaded_policy = true;
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} else {
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log_open();
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if (enforce > 0) {
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if (!initialized) {
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log_emergency("Failed to load SELinux policy.");
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return -EIO;
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}
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log_warning("Failed to load new SELinux policy. Continuing with old policy.");
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} else
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log_debug("Unable to load SELinux policy. Ignoring.");
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}
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#endif
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return 0;
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}
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