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5294bac97e
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>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* SafeSetID Linux Security Module
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*
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* Author: Micah Morton <mortonm@chromium.org>
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*
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* Copyright (C) 2018 The Chromium OS Authors.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2, as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef _SAFESETID_H
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#define _SAFESETID_H
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#include <linux/types.h>
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#include <linux/uidgid.h>
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#include <linux/hashtable.h>
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/* Flag indicating whether initialization completed */
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extern int safesetid_initialized;
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enum sid_policy_type {
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SIDPOL_DEFAULT, /* source ID is unaffected by policy */
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SIDPOL_CONSTRAINED, /* source ID is affected by policy */
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SIDPOL_ALLOWED /* target ID explicitly allowed */
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};
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typedef union {
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kuid_t uid;
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kgid_t gid;
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} kid_t;
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enum setid_type {
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UID,
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GID
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};
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/*
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* Hash table entry to store safesetid policy signifying that 'src_id'
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* can set*id to 'dst_id'.
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*/
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struct setid_rule {
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struct hlist_node next;
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kid_t src_id;
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kid_t dst_id;
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/* Flag to signal if rule is for UID's or GID's */
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enum setid_type type;
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};
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#define SETID_HASH_BITS 8 /* 256 buckets in hash table */
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/* Extension of INVALID_UID/INVALID_GID for kid_t type */
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#define INVALID_ID (kid_t){.uid = INVALID_UID}
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struct setid_ruleset {
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DECLARE_HASHTABLE(rules, SETID_HASH_BITS);
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char *policy_str;
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struct rcu_head rcu;
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//Flag to signal if ruleset is for UID's or GID's
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enum setid_type type;
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};
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enum sid_policy_type _setid_policy_lookup(struct setid_ruleset *policy,
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kid_t src, kid_t dst);
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extern struct setid_ruleset __rcu *safesetid_setuid_rules;
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extern struct setid_ruleset __rcu *safesetid_setgid_rules;
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#endif /* _SAFESETID_H */
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