euid switching

1 files changed, 48 insertions, 0 deletions

diff --git a/src/include/euid_common.h b/src/include/euid_common.h
new file mode 100644
index 000000000..1cba548ab
--- /dev/null
+++ b/src/include/euid_common.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2014-2016 netblue30 (netblue30@yahoo.com)
+ *
+ * This file is part of firejail project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef EUID_COMMON_H
+#define EUID_COMMON_H
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+extern uid_t firejail_uid;
+extern uid_t firejail_uid_switch;
+
+static inline void EUID_ROOT(void) {
+        if (seteuid(0) == -1)
+                fprintf(stderr, "Error: cannot switch euid to root\n");
+}
+
+static inline void EUID_USER(void) {
+        if (seteuid(firejail_uid) == -1)
+                fprintf(stderr, "Error: cannot switch euid to user\n");
+}
+
+static inline void EUID_PRINT(void) {
+        printf("debug: uid %d, euid %d\n", getuid(), geteuid());
+}
+
+static inline void EUID_INIT(void) {
+        firejail_uid = getuid();
+}
+
+#endif