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-rw-r--r--security/safesetid/lsm.h73
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diff --git a/security/safesetid/lsm.h b/security/safesetid/lsm.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * SafeSetID Linux Security Module
+ *
+ * Author: Micah Morton <mortonm@chromium.org>
+ *
+ * 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 <linux/types.h>
+#include <linux/uidgid.h>
+#include <linux/hashtable.h>
+
+/* Flag indicating whether initialization completed */
+extern int safesetid_initialized;
+
+enum sid_policy_type {
+ SIDPOL_DEFAULT, /* source ID is unaffected by policy */
+ SIDPOL_CONSTRAINED, /* source ID is affected by policy */
+ SIDPOL_ALLOWED /* target ID explicitly allowed */
+};
+
+typedef union {
+ kuid_t uid;
+ kgid_t gid;
+} kid_t;
+
+enum setid_type {
+ UID,
+ GID
+};
+
+/*
+ * Hash table entry to store safesetid policy signifying that 'src_id'
+ * can set*id to 'dst_id'.
+ */
+struct setid_rule {
+ struct hlist_node next;
+ kid_t src_id;
+ kid_t dst_id;
+
+ /* Flag to signal if rule is for UID's or GID's */
+ enum setid_type type;
+};
+
+#define SETID_HASH_BITS 8 /* 256 buckets in hash table */
+
+/* Extension of INVALID_UID/INVALID_GID for kid_t type */
+#define INVALID_ID (kid_t){.uid = INVALID_UID}
+
+struct setid_ruleset {
+ DECLARE_HASHTABLE(rules, SETID_HASH_BITS);
+ char *policy_str;
+ struct rcu_head rcu;
+
+ //Flag to signal if ruleset is for UID's or GID's
+ enum setid_type type;
+};
+
+enum sid_policy_type _setid_policy_lookup(struct setid_ruleset *policy,
+ kid_t src, kid_t dst);
+
+extern struct setid_ruleset __rcu *safesetid_setuid_rules;
+extern struct setid_ruleset __rcu *safesetid_setgid_rules;
+
+#endif /* _SAFESETID_H */