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Linux kernel mirror (for testing)
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1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor policy definitions.
5 *
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2017 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
15#ifndef __AA_NAMESPACE_H
16#define __AA_NAMESPACE_H
17
18#include <linux/kref.h>
19
20#include "apparmor.h"
21#include "apparmorfs.h"
22#include "label.h"
23#include "policy.h"
24
25
26/* struct aa_ns_acct - accounting of profiles in namespace
27 * @max_size: maximum space allowed for all profiles in namespace
28 * @max_count: maximum number of profiles that can be in this namespace
29 * @size: current size of profiles
30 * @count: current count of profiles (includes null profiles)
31 */
32struct aa_ns_acct {
33 int max_size;
34 int max_count;
35 int size;
36 int count;
37};
38
39/* struct aa_ns - namespace for a set of profiles
40 * @base: common policy
41 * @parent: parent of namespace
42 * @lock: lock for modifying the object
43 * @acct: accounting for the namespace
44 * @unconfined: special unconfined profile for the namespace
45 * @sub_ns: list of namespaces under the current namespace.
46 * @uniq_null: uniq value used for null learning profiles
47 * @uniq_id: a unique id count for the profiles in the namespace
48 * @level: level of ns within the tree hierarchy
49 * @dents: dentries for the namespaces file entries in apparmorfs
50 *
51 * An aa_ns defines the set profiles that are searched to determine which
52 * profile to attach to a task. Profiles can not be shared between aa_ns
53 * and profile names within a namespace are guaranteed to be unique. When
54 * profiles in separate namespaces have the same name they are NOT considered
55 * to be equivalent.
56 *
57 * Namespaces are hierarchical and only namespaces and profiles below the
58 * current namespace are visible.
59 *
60 * Namespace names must be unique and can not contain the characters :/\0
61 */
62struct aa_ns {
63 struct aa_policy base;
64 struct aa_ns *parent;
65 struct mutex lock;
66 struct aa_ns_acct acct;
67 struct aa_profile *unconfined;
68 struct list_head sub_ns;
69 atomic_t uniq_null;
70 long uniq_id;
71 int level;
72 long revision;
73 wait_queue_head_t wait;
74
75 struct aa_labelset labels;
76 struct list_head rawdata_list;
77
78 struct dentry *dents[AAFS_NS_SIZEOF];
79};
80
81extern struct aa_ns *root_ns;
82
83extern const char *aa_hidden_ns_name;
84
85#define ns_unconfined(NS) (&(NS)->unconfined->label)
86
87bool aa_ns_visible(struct aa_ns *curr, struct aa_ns *view, bool subns);
88const char *aa_ns_name(struct aa_ns *parent, struct aa_ns *child, bool subns);
89void aa_free_ns(struct aa_ns *ns);
90int aa_alloc_root_ns(void);
91void aa_free_root_ns(void);
92void aa_free_ns_kref(struct kref *kref);
93
94struct aa_ns *aa_find_ns(struct aa_ns *root, const char *name);
95struct aa_ns *aa_findn_ns(struct aa_ns *root, const char *name, size_t n);
96struct aa_ns *__aa_lookupn_ns(struct aa_ns *view, const char *hname, size_t n);
97struct aa_ns *aa_lookupn_ns(struct aa_ns *view, const char *name, size_t n);
98struct aa_ns *__aa_find_or_create_ns(struct aa_ns *parent, const char *name,
99 struct dentry *dir);
100struct aa_ns *aa_prepare_ns(struct aa_ns *root, const char *name);
101void __aa_remove_ns(struct aa_ns *ns);
102
103static inline struct aa_profile *aa_deref_parent(struct aa_profile *p)
104{
105 return rcu_dereference_protected(p->parent,
106 mutex_is_locked(&p->ns->lock));
107}
108
109/**
110 * aa_get_ns - increment references count on @ns
111 * @ns: namespace to increment reference count of (MAYBE NULL)
112 *
113 * Returns: pointer to @ns, if @ns is NULL returns NULL
114 * Requires: @ns must be held with valid refcount when called
115 */
116static inline struct aa_ns *aa_get_ns(struct aa_ns *ns)
117{
118 if (ns)
119 aa_get_profile(ns->unconfined);
120
121 return ns;
122}
123
124/**
125 * aa_put_ns - decrement refcount on @ns
126 * @ns: namespace to put reference of
127 *
128 * Decrement reference count of @ns and if no longer in use free it
129 */
130static inline void aa_put_ns(struct aa_ns *ns)
131{
132 if (ns)
133 aa_put_profile(ns->unconfined);
134}
135
136/**
137 * __aa_findn_ns - find a namespace on a list by @name
138 * @head: list to search for namespace on (NOT NULL)
139 * @name: name of namespace to look for (NOT NULL)
140 * @n: length of @name
141 * Returns: unrefcounted namespace
142 *
143 * Requires: rcu_read_lock be held
144 */
145static inline struct aa_ns *__aa_findn_ns(struct list_head *head,
146 const char *name, size_t n)
147{
148 return (struct aa_ns *)__policy_strn_find(head, name, n);
149}
150
151static inline struct aa_ns *__aa_find_ns(struct list_head *head,
152 const char *name)
153{
154 return __aa_findn_ns(head, name, strlen(name));
155}
156
157static inline struct aa_ns *__aa_lookup_ns(struct aa_ns *base,
158 const char *hname)
159{
160 return __aa_lookupn_ns(base, hname, strlen(hname));
161}
162
163static inline struct aa_ns *aa_lookup_ns(struct aa_ns *view, const char *name)
164{
165 return aa_lookupn_ns(view, name, strlen(name));
166}
167
168#endif /* AA_NAMESPACE_H */