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Diffstat (limited to 'security/apparmor/include/policy_ns.h')
| -rw-r--r-- | security/apparmor/include/policy_ns.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/security/apparmor/include/policy_ns.h b/security/apparmor/include/policy_ns.h new file mode 100644 index 000000000000..89cffddd7e75 --- /dev/null +++ b/security/apparmor/include/policy_ns.h @@ -0,0 +1,147 @@ +/* + * AppArmor security module + * + * This file contains AppArmor policy definitions. + * + * Copyright (C) 1998-2008 Novell/SUSE + * Copyright 2009-2017 Canonical Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation, version 2 of the + * License. + */ + +#ifndef __AA_NAMESPACE_H +#define __AA_NAMESPACE_H + +#include <linux/kref.h> + +#include "apparmor.h" +#include "apparmorfs.h" +#include "policy.h" + + +/* struct aa_ns_acct - accounting of profiles in namespace + * @max_size: maximum space allowed for all profiles in namespace + * @max_count: maximum number of profiles that can be in this namespace + * @size: current size of profiles + * @count: current count of profiles (includes null profiles) + */ +struct aa_ns_acct { + int max_size; + int max_count; + int size; + int count; +}; + +/* struct aa_ns - namespace for a set of profiles + * @base: common policy + * @parent: parent of namespace + * @lock: lock for modifying the object + * @acct: accounting for the namespace + * @unconfined: special unconfined profile for the namespace + * @sub_ns: list of namespaces under the current namespace. + * @uniq_null: uniq value used for null learning profiles + * @uniq_id: a unique id count for the profiles in the namespace + * @level: level of ns within the tree hierarchy + * @dents: dentries for the namespaces file entries in apparmorfs + * + * An aa_ns defines the set profiles that are searched to determine which + * profile to attach to a task. Profiles can not be shared between aa_ns + * and profile names within a namespace are guaranteed to be unique. When + * profiles in separate namespaces have the same name they are NOT considered + * to be equivalent. + * + * Namespaces are hierarchical and only namespaces and profiles below the + * current namespace are visible. + * + * Namespace names must be unique and can not contain the characters :/\0 + */ +struct aa_ns { + struct aa_policy base; + struct aa_ns *parent; + struct mutex lock; + struct aa_ns_acct acct; + struct aa_profile *unconfined; + struct list_head sub_ns; + atomic_t uniq_null; + long uniq_id; + int level; + + struct dentry *dents[AAFS_NS_SIZEOF]; +}; + +extern struct aa_ns *root_ns; + +extern const char *aa_hidden_ns_name; + +bool aa_ns_visible(struct aa_ns *curr, struct aa_ns *view, bool subns); +const char *aa_ns_name(struct aa_ns *parent, struct aa_ns *child, bool subns); +void aa_free_ns(struct aa_ns *ns); +int aa_alloc_root_ns(void); +void aa_free_root_ns(void); +void aa_free_ns_kref(struct kref *kref); + +struct aa_ns *aa_find_ns(struct aa_ns *root, const char *name); +struct aa_ns *aa_findn_ns(struct aa_ns *root, const char *name, size_t n); +struct aa_ns *__aa_find_or_create_ns(struct aa_ns *parent, const char *name, + struct dentry *dir); +struct aa_ns *aa_prepare_ns(struct aa_ns *root, const char *name); +void __aa_remove_ns(struct aa_ns *ns); + +static inline struct aa_profile *aa_deref_parent(struct aa_profile *p) +{ + return rcu_dereference_protected(p->parent, + mutex_is_locked(&p->ns->lock)); +} + +/** + * aa_get_ns - increment references count on @ns + * @ns: namespace to increment reference count of (MAYBE NULL) + * + * Returns: pointer to @ns, if @ns is NULL returns NULL + * Requires: @ns must be held with valid refcount when called + */ +static inline struct aa_ns *aa_get_ns(struct aa_ns *ns) +{ + if (ns) + aa_get_profile(ns->unconfined); + + return ns; +} + +/** + * aa_put_ns - decrement refcount on @ns + * @ns: namespace to put reference of + * + * Decrement reference count of @ns and if no longer in use free it + */ +static inline void aa_put_ns(struct aa_ns *ns) +{ + if (ns) + aa_put_profile(ns->unconfined); +} + +/** + * __aa_findn_ns - find a namespace on a list by @name + * @head: list to search for namespace on (NOT NULL) + * @name: name of namespace to look for (NOT NULL) + * @n: length of @name + * Returns: unrefcounted namespace + * + * Requires: rcu_read_lock be held + */ +static inline struct aa_ns *__aa_findn_ns(struct list_head *head, + const char *name, size_t n) +{ + return (struct aa_ns *)__policy_strn_find(head, name, n); +} + +static inline struct aa_ns *__aa_find_ns(struct list_head *head, + const char *name) +{ + return __aa_findn_ns(head, name, strlen(name)); +} + +#endif /* AA_NAMESPACE_H */ |