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-rw-r--r--src/shared/smack-util.c45
1 files changed, 43 insertions, 2 deletions
diff --git a/src/shared/smack-util.c b/src/shared/smack-util.c
index 8f83562bf6..04ee217d2f 100644
--- a/src/shared/smack-util.c
+++ b/src/shared/smack-util.c
@@ -21,10 +21,10 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
-#include <unistd.h>
-#include <string.h>
#include <sys/xattr.h>
+#include "util.h"
+#include "path-util.h"
#include "smack-util.h"
bool use_smack(void) {
@@ -87,3 +87,44 @@ int smack_label_ip_in_fd(int fd, const char *label) {
return 0;
#endif
}
+
+int smack_relabel_in_dev(const char *path) {
+ int r = 0;
+
+#ifdef HAVE_SMACK
+ struct stat sb;
+ const char *label;
+
+ /*
+ * Path must be in /dev and must exist
+ */
+ if (!path_startswith(path, "/dev"))
+ return 0;
+
+ r = lstat(path, &sb);
+ if (r < 0)
+ return -errno;
+
+ /*
+ * Label directories and character devices "*".
+ * Label symlinks "_".
+ * Don't change anything else.
+ */
+ if (S_ISDIR(sb.st_mode))
+ label = SMACK_STAR_LABEL;
+ else if (S_ISLNK(sb.st_mode))
+ label = SMACK_FLOOR_LABEL;
+ else if (S_ISCHR(sb.st_mode))
+ label = SMACK_STAR_LABEL;
+ else
+ return 0;
+
+ r = setxattr(path, "security.SMACK64", label, strlen(label), 0);
+ if (r < 0) {
+ log_error("Smack relabeling \"%s\" %m", path);
+ return -errno;
+ }
+#endif
+
+ return r;
+}