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) {
+#define SMACK_FLOOR_LABEL "_"
+#define SMACK_STAR_LABEL "*"
+
+bool mac_smack_use(void) {
#ifdef HAVE_SMACK
- static int use_smack_cached = -1;
+ static int cached_use = -1;
- if (use_smack_cached < 0)
- use_smack_cached = access("/sys/fs/smackfs/", F_OK) >= 0;
+ if (cached_use < 0)
+ cached_use = access("/sys/fs/smackfs/", F_OK) >= 0;
- return use_smack_cached;
+ return cached_use;
#else
return false;
#endif
+}
+
+int mac_smack_apply(const char *path, const char *label) {
+ int r = 0;
+ assert(path);
+
+#ifdef HAVE_SMACK
+ if (!mac_smack_use())
+ return 0;
+
+ if (label)
+ r = lsetxattr(path, "security.SMACK64", label, strlen(label), 0);
+ else
+ r = lremovexattr(path, "security.SMACK64");
+ if (r < 0)
+ return -errno;
+#endif
+
+ return r;
}
-int smack_label_path(const char *path, const char *label) {
+int mac_smack_apply_fd(int fd, const char *label) {
+ int r = 0;
+
+ assert(fd >= 0);
+
#ifdef HAVE_SMACK
- if (!use_smack())
+ if (!mac_smack_use())
return 0;
if (label)
- return setxattr(path, "security.SMACK64", label, strlen(label), 0);
+ r = fsetxattr(fd, "security.SMACK64", label, strlen(label), 0);
else
- return lremovexattr(path, "security.SMACK64");
-#else
- return 0;
+ r = fremovexattr(fd, "security.SMACK64");
+ if (r < 0)
+ return -errno;
#endif
+
+ return r;
}
-int smack_label_fd(int fd, const char *label) {
+int mac_smack_apply_ip_out_fd(int fd, const char *label) {
+ int r = 0;
+
+ assert(fd >= 0);
+
#ifdef HAVE_SMACK
- if (!use_smack())
+ if (!mac_smack_use())
return 0;
- return fsetxattr(fd, "security.SMACK64", label, strlen(label), 0);
-#else
- return 0;
+ if (label)
+ r = fsetxattr(fd, "security.SMACK64IPOUT", label, strlen(label), 0);
+ else
+ r = fremovexattr(fd, "security.SMACK64IPOUT");
+ if (r < 0)
+ return -errno;
#endif
+
+ return r;
}
-int smack_label_ip_out_fd(int fd, const char *label) {
+int mac_smack_apply_ip_in_fd(int fd, const char *label) {
+ int r = 0;
+
+ assert(fd >= 0);
+
#ifdef HAVE_SMACK
- if (!use_smack())
+ if (!mac_smack_use())
return 0;
- return fsetxattr(fd, "security.SMACK64IPOUT", label, strlen(label), 0);
-#else
- return 0;
+ if (label)
+ r = fsetxattr(fd, "security.SMACK64IPIN", label, strlen(label), 0);
+ else
+ r = fremovexattr(fd, "security.SMACK64IPIN");
+ if (r < 0)
+ return -errno;
#endif
+
+ return r;
}
-int smack_label_ip_in_fd(int fd, const char *label) {
+int mac_smack_fix(const char *path, bool ignore_enoent, bool ignore_erofs) {
+ int r = 0;
+
#ifdef HAVE_SMACK
- if (!use_smack())
+ struct stat st;
+
+ assert(path);
+
+ if (!mac_smack_use())
return 0;
- return fsetxattr(fd, "security.SMACK64IPIN", label, strlen(label), 0);
-#else
- return 0;
+ /*
+ * Path must be in /dev and must exist
+ */
+ if (!path_startswith(path, "/dev"))
+ return 0;
+
+ r = lstat(path, &st);
+ if (r >= 0) {
+ const char *label;
+
+ /*
+ * Label directories and character devices "*".
+ * Label symlinks "_".
+ * Don't change anything else.
+ */
+
+ if (S_ISDIR(st.st_mode))
+ label = SMACK_STAR_LABEL;
+ else if (S_ISLNK(st.st_mode))
+ label = SMACK_FLOOR_LABEL;
+ else if (S_ISCHR(st.st_mode))
+ label = SMACK_STAR_LABEL;
+ else
+ return 0;
+
+ r = lsetxattr(path, "security.SMACK64", label, strlen(label), 0);
+
+ /* 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_debug("Unable to fix SMACK label of %s: %m", path);
+ r = -errno;
+ }
#endif
+
+ return r;
}