label: rearrange mandatory access control(MAC) apis

[elogind.git] / src / shared / smack-util.c

diff --git a/src/shared/smack-util.c b/src/shared/smack-util.c
index a73eaac6de26559cce83a56020e4104be8d1f497..04ee217d2f4e61bf2fbad1662c03a31c57a6fa20 100644 (file)
--- a/src/shared/smack-util.c
+++ b/src/shared/smack-util.c
@@ -21,16 +21,110 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
-#include "smack-util.h"
-
-#include <unistd.h>
+#include <sys/xattr.h>
 
-static int use_smack_cached = -1;
+#include "util.h"
+#include "path-util.h"
+#include "smack-util.h"
 
 bool use_smack(void) {
+#ifdef HAVE_SMACK
+        static int use_smack_cached = -1;
 
         if (use_smack_cached < 0)
-                use_smack_cached = (access("/sys/fs/smackfs", F_OK) >= 0);
+                use_smack_cached = access("/sys/fs/smackfs/", F_OK) >= 0;
 
         return use_smack_cached;
+#else
+        return false;
+#endif
+
+}
+
+int smack_label_path(const char *path, const char *label) {
+#ifdef HAVE_SMACK
+        if (!use_smack())
+                return 0;
+
+        if (label)
+                return setxattr(path, "security.SMACK64", label, strlen(label), 0);
+        else
+                return lremovexattr(path, "security.SMACK64");
+#else
+        return 0;
+#endif
+}
+
+int smack_label_fd(int fd, const char *label) {
+#ifdef HAVE_SMACK
+        if (!use_smack())
+                return 0;
+
+        return fsetxattr(fd, "security.SMACK64", label, strlen(label), 0);
+#else
+        return 0;
+#endif
+}
+
+int smack_label_ip_out_fd(int fd, const char *label) {
+#ifdef HAVE_SMACK
+        if (!use_smack())
+                return 0;
+
+        return fsetxattr(fd, "security.SMACK64IPOUT", label, strlen(label), 0);
+#else
+        return 0;
+#endif
+}
+
+int smack_label_ip_in_fd(int fd, const char *label) {
+#ifdef HAVE_SMACK
+        if (!use_smack())
+                return 0;
+
+        return fsetxattr(fd, "security.SMACK64IPIN", label, strlen(label), 0);
+#else
+        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;
 }