linux/security/safesetid/lsm.h
Thomas Cedeno 5294bac97e LSM: SafeSetID: Add GID security policy handling
The SafeSetID LSM has functionality for restricting setuid() calls based
on its configured security policies. This patch adds the analogous
functionality for setgid() calls. This is mostly a copy-and-paste change
with some code deduplication, plus slight modifications/name changes to
the policy-rule-related structs (now contain GID rules in addition to
the UID ones) and some type generalization since SafeSetID now needs to
deal with kgid_t and kuid_t types.

Signed-off-by: Thomas Cedeno <thomascedeno@google.com>
Signed-off-by: Micah Morton <mortonm@chromium.org>
2020-10-13 09:17:35 -07:00

74 lines
1.7 KiB
C

/* 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 */