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TOMOYO Linux Cross Reference
Linux/security/apparmor/include/policy_ns.h

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  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_ns *root_ns;
 78 
 79 extern const char *aa_hidden_ns_name;
 80 
 81 #define ns_unconfined(NS) (&(NS)->unconfined->label)
 82 
 83 bool aa_ns_visible(struct aa_ns *curr, struct aa_ns *view, bool subns);
 84 const char *aa_ns_name(struct aa_ns *parent, struct aa_ns *child, bool subns);
 85 void aa_free_ns(struct aa_ns *ns);
 86 int aa_alloc_root_ns(void);
 87 void aa_free_root_ns(void);
 88 void aa_free_ns_kref(struct kref *kref);
 89 
 90 struct aa_ns *aa_find_ns(struct aa_ns *root, const char *name);
 91 struct aa_ns *aa_findn_ns(struct aa_ns *root, const char *name, size_t n);
 92 struct aa_ns *__aa_lookupn_ns(struct aa_ns *view, const char *hname, size_t n);
 93 struct aa_ns *aa_lookupn_ns(struct aa_ns *view, const char *name, size_t n);
 94 struct aa_ns *__aa_find_or_create_ns(struct aa_ns *parent, const char *name,
 95                                      struct dentry *dir);
 96 struct aa_ns *aa_prepare_ns(struct aa_ns *root, const char *name);
 97 void __aa_remove_ns(struct aa_ns *ns);
 98 
 99 static inline struct aa_profile *aa_deref_parent(struct aa_profile *p)
100 {
101         return rcu_dereference_protected(p->parent,
102                                          mutex_is_locked(&p->ns->lock));
103 }
104 
105 /**
106  * aa_get_ns - increment references count on @ns
107  * @ns: namespace to increment reference count of (MAYBE NULL)
108  *
109  * Returns: pointer to @ns, if @ns is NULL returns NULL
110  * Requires: @ns must be held with valid refcount when called
111  */
112 static inline struct aa_ns *aa_get_ns(struct aa_ns *ns)
113 {
114         if (ns)
115                 aa_get_profile(ns->unconfined);
116 
117         return ns;
118 }
119 
120 /**
121  * aa_put_ns - decrement refcount on @ns
122  * @ns: namespace to put reference of
123  *
124  * Decrement reference count of @ns and if no longer in use free it
125  */
126 static inline void aa_put_ns(struct aa_ns *ns)
127 {
128         if (ns)
129                 aa_put_profile(ns->unconfined);
130 }
131 
132 /**
133  * __aa_findn_ns - find a namespace on a list by @name
134  * @head: list to search for namespace on  (NOT NULL)
135  * @name: name of namespace to look for  (NOT NULL)
136  * @n: length of @name
137  * Returns: unrefcounted namespace
138  *
139  * Requires: rcu_read_lock be held
140  */
141 static inline struct aa_ns *__aa_findn_ns(struct list_head *head,
142                                           const char *name, size_t n)
143 {
144         return (struct aa_ns *)__policy_strn_find(head, name, n);
145 }
146 
147 static inline struct aa_ns *__aa_find_ns(struct list_head *head,
148                                          const char *name)
149 {
150         return __aa_findn_ns(head, name, strlen(name));
151 }
152 
153 static inline struct aa_ns *__aa_lookup_ns(struct aa_ns *base,
154                                            const char *hname)
155 {
156         return __aa_lookupn_ns(base, hname, strlen(hname));
157 }
158 
159 static inline struct aa_ns *aa_lookup_ns(struct aa_ns *view, const char *name)
160 {
161         return aa_lookupn_ns(view, name, strlen(name));
162 }
163 
164 #endif /* AA_NAMESPACE_H */
165 

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