+#ifdef HAVE_SELINUX
+DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon);
+DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free);
+
+#define _cleanup_security_context_free_ _cleanup_(freeconp)
+#define _cleanup_context_free_ _cleanup_(context_freep)
+
+static int cached_use = -1;
+static struct selabel_handle *label_hnd = NULL;
+
+#define log_enforcing(...) log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, __VA_ARGS__)
+#endif
+
+bool mac_selinux_use(void) {
+#ifdef HAVE_SELINUX
+ if (cached_use < 0)
+ cached_use = is_selinux_enabled() > 0;
+
+ return cached_use;
+#else
+ return false;
+#endif
+}
+
+void mac_selinux_retest(void) {
+#ifdef HAVE_SELINUX
+ cached_use = -1;
+#endif
+}
+
+int mac_selinux_init(const char *prefix) {
+ int r = 0;
+
+#ifdef HAVE_SELINUX
+ usec_t before_timestamp, after_timestamp;
+ struct mallinfo before_mallinfo, after_mallinfo;
+
+ if (!mac_selinux_use())
+ return 0;
+
+ if (label_hnd)
+ return 0;
+
+ before_mallinfo = mallinfo();
+ before_timestamp = now(CLOCK_MONOTONIC);
+
+ if (prefix) {
+ struct selinux_opt options[] = {
+ { .type = SELABEL_OPT_SUBSET, .value = prefix },
+ };
+
+ label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options));
+ } else
+ label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+
+ if (!label_hnd) {
+ log_enforcing("Failed to initialize SELinux context: %m");
+ r = security_getenforce() == 1 ? -errno : 0;
+ } else {
+ char timespan[FORMAT_TIMESPAN_MAX];
+ int l;
+
+ after_timestamp = now(CLOCK_MONOTONIC);
+ after_mallinfo = mallinfo();
+
+ l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0;
+
+ log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.",
+ format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0),
+ (l+1023)/1024);
+ }
+#endif
+
+ return r;
+}
+
+void mac_selinux_finish(void) {
+
+#ifdef HAVE_SELINUX
+ if (!label_hnd)
+ return;
+
+ selabel_close(label_hnd);
+#endif
+}
+
+int mac_selinux_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
+
+#ifdef HAVE_SELINUX
+ struct stat st;
+ int r;
+
+ assert(path);
+
+ /* if mac_selinux_init() wasn't called before we are a NOOP */
+ if (!label_hnd)
+ return 0;
+
+ r = lstat(path, &st);
+ if (r >= 0) {
+ _cleanup_security_context_free_ security_context_t fcon = NULL;
+
+ r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode);
+
+ /* If there's no label to set, then exit without warning */
+ if (r < 0 && errno == ENOENT)
+ return 0;
+
+ if (r >= 0) {
+ r = lsetfilecon(path, fcon);
+
+ /* If the FS doesn't support labels, then exit without warning */
+ if (r < 0 && errno == ENOTSUP)
+ return 0;
+ }
+ }
+
+ if (r < 0) {
+ /* Ignore ENOENT in some cases */
+ if (ignore_enoent && errno == ENOENT)
+ return 0;
+
+ if (ignore_erofs && errno == EROFS)
+ return 0;
+
+ log_enforcing("Unable to fix SELinux security context of %s: %m", path);
+ if (security_getenforce() == 1)
+ return -errno;
+ }
+#endif
+
+ return 0;
+}
+
+int mac_selinux_apply(const char *path, const char *label) {
+
+#ifdef HAVE_SELINUX
+ assert(path);
+ assert(label);
+
+ if (!mac_selinux_use())
+ return 0;
+
+ if (setfilecon(path, (security_context_t) label) < 0) {
+ log_enforcing("Failed to set SELinux security context %s on path %s: %m", label, path);
+ if (security_getenforce() == 1)
+ return -errno;
+ }
+#endif
+ return 0;
+}
+
+int mac_selinux_get_create_label_from_exe(const char *exe, char **label) {
+ int r = -EOPNOTSUPP;
+
+#ifdef HAVE_SELINUX
+ _cleanup_security_context_free_ security_context_t mycon = NULL, fcon = NULL;
+ security_class_t sclass;
+
+ assert(exe);
+ assert(label);
+
+ if (!mac_selinux_use())
+ return -EOPNOTSUPP;
+
+ r = getcon(&mycon);
+ if (r < 0)
+ return -errno;
+
+ r = getfilecon(exe, &fcon);
+ if (r < 0)
+ return -errno;
+
+ sclass = string_to_security_class("process");
+ r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label);
+ if (r < 0)
+ return -errno;
+#endif
+
+ return r;
+}
+
+int mac_selinux_get_our_label(char **label) {
+ int r = -EOPNOTSUPP;
+
+ assert(label);
+
+#ifdef HAVE_SELINUX
+ if (!mac_selinux_use())
+ return -EOPNOTSUPP;
+
+ r = getcon(label);
+ if (r < 0)
+ return -errno;
+#endif
+
+ return r;
+}
+
+int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, char **label) {
+ int r = -EOPNOTSUPP;