X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/a8167c6611e582ef826e4ee06b590706385470ef..89363676953c674450b68e9133193da83702e8a8:/util.c

diff --git a/util.c b/util.c
index 875af11e..12b88edd 100644
--- a/util.c
+++ b/util.c
@@ -900,6 +900,46 @@ int safe_stat(const char *fname, STRUCT_STAT *stp)
 #endif
 }
 
+void die_on_unsafe_path(char *path, int strip_filename)
+{
+#ifdef SUPPORT_LINKS
+	char *final_slash, *p;
+	STRUCT_STAT st;
+
+	if (!path)
+		return;
+	if (strip_filename) {
+		if (!(final_slash = strrchr(path, '/')))
+			return;
+		*final_slash = '\0';
+	} else
+		final_slash = NULL;
+
+	p = path;
+	if (*p == '/')
+		p += module_dirlen + 1;
+	while (*p) {
+		if ((p = strchr(p, '/')) != NULL)
+			*p = '\0';
+		if (safe_stat(path, &st) < 0) {
+			*p++ = '/';
+			goto done;
+		}
+		if (S_ISLNK(st.st_mode)) {
+			rprintf(FERROR, "Unsafe path: %s\n", path);
+			exit_cleanup(RERR_SYNTAX);
+		}
+		if (!p)
+			break;
+		*p++ = '/';
+	}
+
+  done:
+	if (final_slash)
+		*final_slash = '/';
+#endif
+}
+
 /* Like chdir(), but it keeps track of the current directory (in the
  * global "curr_dir"), and ensures that the path size doesn't overflow.
  * Also cleans the path using the clean_fname() function. */
@@ -1026,13 +1066,11 @@ char *partial_dir_fname(const char *fname)
 	if ((int)pathjoin(t, sz, partial_dir, fn) >= sz)
 		return NULL;
 	if (server_filter_list.head) {
-		static int len;
-		if (!len)
-			len = strlen(partial_dir);
-		t[len] = '\0';
+		t = strrchr(partial_fname, '/');
+		*t = '\0';
 		if (check_filter(&server_filter_list, partial_fname, 1) < 0)
 			return NULL;
-		t[len] = '/';
+		*t = '/';
 		if (check_filter(&server_filter_list, partial_fname, 0) < 0)
 			return NULL;
 	}
@@ -1058,6 +1096,8 @@ int handle_partial_dir(const char *fname, int create)
 	if (create) {
 		STRUCT_STAT st;
 		int statret = do_lstat(dir, &st);
+		if (sanitize_paths && *partial_dir != '/')
+			die_on_unsafe_path(dir, 1); /* lstat handles last element */
 		if (statret == 0 && !S_ISDIR(st.st_mode)) {
 			if (do_unlink(dir) < 0)
 				return 0;