1 files changed, 121 insertions, 0 deletions
diff --git a/src/grp-system/libcore/src/selinux-setup.c b/src/grp-system/libcore/src/selinux-setup.c
new file mode 100644
index 0000000000..d81a8e7fa1
--- /dev/null
+++ b/src/grp-system/libcore/src/selinux-setup.c
@@ -0,0 +1,121 @@
+/***
+  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 "core/selinux-setup.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/macro.h"
+#include "systemd-basic/selinux-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/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;
+        char *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_raw(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;
+}