Fix tdm auth backend for openbsd

Signed-off-by: François Andriot <francois.andriot@free.fr>"

tdm/backend/auth.c

@@ -41,6 +41,9 @@ from the copyright holder.
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <stdlib.h>
+#ifdef __OpenBSD__
+#include <pwd.h>
+#endif
 
 #include <sys/ioctl.h>
 
@@ -290,6 +293,26 @@ SaveServerAuthorizations( struct display *d, Xauth **auths, int count )
 			return FALSE;
 		}
 	}
+#ifdef __OpenBSD__
+    {
+       struct passwd *x11;
+       uid_t uid;
+       gid_t gid;
+       /* Give read capability to group _x11 */
+       x11 = getpwnam("_x11");
+       if (x11 == NULL) {
+           LogError("Can't find _x11 user\n");
+           uid = getuid();
+           gid = getgid();
+       } else {
+           uid = x11->pw_uid;
+           gid = x11->pw_gid;
+       }
+
+       fchown(fileno(auth_file), uid, gid);
+    }
+#endif
+
 	Debug( "file: %s  auth: %p\n", d->authFile, auths );
 	for (i = 0; i < count; i++) {
 		/*