1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * SafeSetID Linux Security Module 3 * SafeSetID Linux Security Module
4 * 4 *
5 * Author: Micah Morton <mortonm@chromium.org> 5 * Author: Micah Morton <mortonm@chromium.org>
6 * 6 *
7 * Copyright (C) 2018 The Chromium OS Authors. 7 * Copyright (C) 2018 The Chromium OS Authors.
8 * 8 *
9 * This program is free software; you can redi 9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Publi 10 * it under the terms of the GNU General Public License version 2, as
11 * published by the Free Software Foundation. 11 * published by the Free Software Foundation.
12 * 12 *
13 */ 13 */
14 #ifndef _SAFESETID_H 14 #ifndef _SAFESETID_H
15 #define _SAFESETID_H 15 #define _SAFESETID_H
16 16
17 #include <linux/types.h> 17 #include <linux/types.h>
18 #include <linux/uidgid.h> 18 #include <linux/uidgid.h>
19 #include <linux/hashtable.h> 19 #include <linux/hashtable.h>
20 20
21 /* Flag indicating whether initialization comp 21 /* Flag indicating whether initialization completed */
22 extern int safesetid_initialized __initdata; !! 22 extern int safesetid_initialized;
23 23
24 enum sid_policy_type { 24 enum sid_policy_type {
25 SIDPOL_DEFAULT, /* source ID is unaffe 25 SIDPOL_DEFAULT, /* source ID is unaffected by policy */
26 SIDPOL_CONSTRAINED, /* source ID is af 26 SIDPOL_CONSTRAINED, /* source ID is affected by policy */
27 SIDPOL_ALLOWED /* target ID explicitly 27 SIDPOL_ALLOWED /* target ID explicitly allowed */
28 }; 28 };
29 29
30 typedef union { <<
31 kuid_t uid; <<
32 kgid_t gid; <<
33 } kid_t; <<
34 <<
35 enum setid_type { <<
36 UID, <<
37 GID <<
38 }; <<
39 <<
40 /* 30 /*
41 * Hash table entry to store safesetid policy !! 31 * Hash table entry to store safesetid policy signifying that 'src_uid'
42 * can set*id to 'dst_id'. !! 32 * can setuid to 'dst_uid'.
43 */ 33 */
44 struct setid_rule { !! 34 struct setuid_rule {
45 struct hlist_node next; 35 struct hlist_node next;
46 kid_t src_id; !! 36 kuid_t src_uid;
47 kid_t dst_id; !! 37 kuid_t dst_uid;
48 <<
49 /* Flag to signal if rule is for UID's <<
50 enum setid_type type; <<
51 }; 38 };
52 39
53 #define SETID_HASH_BITS 8 /* 256 buckets in ha 40 #define SETID_HASH_BITS 8 /* 256 buckets in hash table */
54 41
55 /* Extension of INVALID_UID/INVALID_GID for ki !! 42 struct setuid_ruleset {
56 #define INVALID_ID (kid_t){.uid = INVALID_UID} <<
57 <<
58 struct setid_ruleset { <<
59 DECLARE_HASHTABLE(rules, SETID_HASH_BI 43 DECLARE_HASHTABLE(rules, SETID_HASH_BITS);
60 char *policy_str; 44 char *policy_str;
61 struct rcu_head rcu; 45 struct rcu_head rcu;
62 <<
63 //Flag to signal if ruleset is for UID <<
64 enum setid_type type; <<
65 }; 46 };
66 47
67 enum sid_policy_type _setid_policy_lookup(stru !! 48 enum sid_policy_type _setuid_policy_lookup(struct setuid_ruleset *policy,
68 kid_t src, kid_t dst); !! 49 kuid_t src, kuid_t dst);
69 50
70 extern struct setid_ruleset __rcu *safesetid_s !! 51 extern struct setuid_ruleset __rcu *safesetid_setuid_rules;
71 extern struct setid_ruleset __rcu *safesetid_s <<
72 52
73 #endif /* _SAFESETID_H */ 53 #endif /* _SAFESETID_H */
74 54
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