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-rw-r--r--src/libcore/selinux-setup.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/src/libcore/selinux-setup.c b/src/libcore/selinux-setup.c
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+++ b/src/libcore/selinux-setup.c
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+/***
+ 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 <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#ifdef HAVE_SELINUX
+#include <selinux/selinux.h>
+#endif
+
+#include "log.h"
+#include "macro.h"
+#include "selinux-setup.h"
+#include "selinux-util.h"
+#include "string-util.h"
+#include "util.h"
+
+#ifdef HAVE_SELINUX
+_printf_(2,3)
+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) {
+ _cleanup_(mac_selinux_freep) char *label = NULL;
+ char timespan[FORMAT_TIMESPAN_MAX];
+
+ mac_selinux_retest();
+
+ /* Transition to the new context */
+ r = mac_selinux_get_create_label_from_exe(SYSTEMD_BINARY_PATH, &label);
+ if (r < 0 || !label) {
+ 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);
+ }
+
+ 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.");
+ 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;
+}