1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * AppArmor security module
4 *
5 * This file contains AppArmor policy definitions.
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2017 Canonical Ltd.
9 */
10
11 #ifndef __AA_NAMESPACE_H
12 #define __AA_NAMESPACE_H
13
14 #include <linux/kref.h>
15
16 #include "apparmor.h"
17 #include "apparmorfs.h"
18 #include "label.h"
19 #include "policy.h"
20
21
22 /* struct aa_ns_acct - accounting of profiles in namespace
23 * @max_size: maximum space allowed for all profiles in namespace
24 * @max_count: maximum number of profiles that can be in this namespace
25 * @size: current size of profiles
26 * @count: current count of profiles (includes null profiles)
27 */
28 struct aa_ns_acct {
29 int max_size;
30 int max_count;
31 int size;
32 int count;
33 };
34
35 /* struct aa_ns - namespace for a set of profiles
36 * @base: common policy
37 * @parent: parent of namespace
38 * @lock: lock for modifying the object
39 * @acct: accounting for the namespace
40 * @unconfined: special unconfined profile for the namespace
41 * @sub_ns: list of namespaces under the current namespace.
42 * @uniq_null: uniq value used for null learning profiles
43 * @uniq_id: a unique id count for the profiles in the namespace
44 * @level: level of ns within the tree hierarchy
45 * @dents: dentries for the namespaces file entries in apparmorfs
46 *
47 * An aa_ns defines the set profiles that are searched to determine which
48 * profile to attach to a task. Profiles can not be shared between aa_ns
49 * and profile names within a namespace are guaranteed to be unique. When
50 * profiles in separate namespaces have the same name they are NOT considered
51 * to be equivalent.
52 *
53 * Namespaces are hierarchical and only namespaces and profiles below the
54 * current namespace are visible.
55 *
56 * Namespace names must be unique and can not contain the characters :/\0
57 */
58 struct aa_ns {
59 struct aa_policy base;
60 struct aa_ns *parent;
61 struct mutex lock;
62 struct aa_ns_acct acct;
63 struct aa_profile *unconfined;
64 struct list_head sub_ns;
65 atomic_t uniq_null;
66 long uniq_id;
67 int level;
68 long revision;
69 wait_queue_head_t wait;
70
71 struct aa_labelset labels;
72 struct list_head rawdata_list;
73
74 struct dentry *dents[AAFS_NS_SIZEOF];
75 };
76
77 extern struct aa_label *kernel_t;
78 extern struct aa_ns *root_ns;
79
80 extern const char *aa_hidden_ns_name;
81
82 #define ns_unconfined(NS) (&(NS)->unconfined->label)
83
84 bool aa_ns_visible(struct aa_ns *curr, struct aa_ns *view, bool subns);
85 const char *aa_ns_name(struct aa_ns *parent, struct aa_ns *child, bool subns);
86 void aa_free_ns(struct aa_ns *ns);
87 int aa_alloc_root_ns(void);
88 void aa_free_root_ns(void);
89
90 struct aa_ns *__aa_lookupn_ns(struct aa_ns *view, const char *hname, size_t n);
91 struct aa_ns *aa_lookupn_ns(struct aa_ns *view, const char *name, size_t n);
92 struct aa_ns *__aa_find_or_create_ns(struct aa_ns *parent, const char *name,
93 struct dentry *dir);
94 struct aa_ns *aa_prepare_ns(struct aa_ns *root, const char *name);
95 void __aa_remove_ns(struct aa_ns *ns);
96
97 static inline struct aa_profile *aa_deref_parent(struct aa_profile *p)
98 {
99 return rcu_dereference_protected(p->parent,
100 mutex_is_locked(&p->ns->lock));
101 }
102
103 /**
104 * aa_get_ns - increment references count on @ns
105 * @ns: namespace to increment reference count of (MAYBE NULL)
106 *
107 * Returns: pointer to @ns, if @ns is NULL returns NULL
108 * Requires: @ns must be held with valid refcount when called
109 */
110 static inline struct aa_ns *aa_get_ns(struct aa_ns *ns)
111 {
112 if (ns)
113 aa_get_profile(ns->unconfined);
114
115 return ns;
116 }
117
118 /**
119 * aa_put_ns - decrement refcount on @ns
120 * @ns: namespace to put reference of
121 *
122 * Decrement reference count of @ns and if no longer in use free it
123 */
124 static inline void aa_put_ns(struct aa_ns *ns)
125 {
126 if (ns)
127 aa_put_profile(ns->unconfined);
128 }
129
130 /**
131 * __aa_findn_ns - find a namespace on a list by @name
132 * @head: list to search for namespace on (NOT NULL)
133 * @name: name of namespace to look for (NOT NULL)
134 * @n: length of @name
135 * Returns: unrefcounted namespace
136 *
137 * Requires: rcu_read_lock be held
138 */
139 static inline struct aa_ns *__aa_findn_ns(struct list_head *head,
140 const char *name, size_t n)
141 {
142 return (struct aa_ns *)__policy_strn_find(head, name, n);
143 }
144
145 static inline struct aa_ns *__aa_find_ns(struct list_head *head,
146 const char *name)
147 {
148 return __aa_findn_ns(head, name, strlen(name));
149 }
150
151 #endif /* AA_NAMESPACE_H */
152
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