From aeca4e2ca65c1aeacfbe520684e6421719d99417 Mon Sep 17 00:00:00 2001 From: Micah Morton Date: Wed, 16 Jan 2019 07:46:06 -0800 Subject: LSM: add SafeSetID module that gates setid calls SafeSetID gates the setid family of syscalls to restrict UID/GID transitions from a given UID/GID to only those approved by a system-wide whitelist. These restrictions also prohibit the given UIDs/GIDs from obtaining auxiliary privileges associated with CAP_SET{U/G}ID, such as allowing a user to set up user namespace UID mappings. For now, only gating the set*uid family of syscalls is supported, with support for set*gid coming in a future patch set. Signed-off-by: Micah Morton Acked-by: Kees Cook Signed-off-by: James Morris --- security/safesetid/lsm.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 security/safesetid/lsm.h (limited to 'security/safesetid/lsm.h') diff --git a/security/safesetid/lsm.h b/security/safesetid/lsm.h new file mode 100644 index 000000000000..c1ea3c265fcf --- /dev/null +++ b/security/safesetid/lsm.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * SafeSetID Linux Security Module + * + * Author: Micah Morton + * + * Copyright (C) 2018 The Chromium OS Authors. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2, as + * published by the Free Software Foundation. + * + */ +#ifndef _SAFESETID_H +#define _SAFESETID_H + +#include + +/* Flag indicating whether initialization completed */ +extern int safesetid_initialized; + +/* Function type. */ +enum safesetid_whitelist_file_write_type { + SAFESETID_WHITELIST_ADD, /* Add whitelist policy. */ + SAFESETID_WHITELIST_FLUSH, /* Flush whitelist policies. */ +}; + +/* Add entry to safesetid whitelist to allow 'parent' to setid to 'child'. */ +int add_safesetid_whitelist_entry(kuid_t parent, kuid_t child); + +void flush_safesetid_whitelist_entries(void); + +#endif /* _SAFESETID_H */ -- cgit v1.2.3