security/apparmor/include/policy.h - kernel/bruno - Git at Google

 /*
  * AppArmor security module
  *
  * This file contains AppArmor policy definitions.
  *
  * Copyright (C) 1998-2008 Novell/SUSE
  * Copyright 2009-2010 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_POLICY_H
 #define __AA_POLICY_H

 #include <linux/capability.h>
 #include <linux/cred.h>
 #include <linux/kref.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/socket.h>

 #include "apparmor.h"
 #include "audit.h"
 #include "capability.h"
 #include "domain.h"
 #include "file.h"
 #include "resource.h"

 extern const char *profile_mode_names[];
 #define APPARMOR_NAMES_MAX_INDEX 3

 #define COMPLAIN_MODE(_profile)	\
 	((aa_g_profile_mode == APPARMOR_COMPLAIN) || \
 	 ((_profile)->mode == APPARMOR_COMPLAIN))

 #define KILL_MODE(_profile) \
 	((aa_g_profile_mode == APPARMOR_KILL) || \
 	 ((_profile)->mode == APPARMOR_KILL))

 #define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT)

 /*
  * FIXME: currently need a clean way to replace and remove profiles as a
  * set.  It should be done at the namespace level.
  * Either, with a set of profiles loaded at the namespace level or via
  * a mark and remove marked interface.
  */
 enum profile_mode {
 	APPARMOR_ENFORCE,	/* enforce access rules */
 	APPARMOR_COMPLAIN,	/* allow and log access violations */
 	APPARMOR_KILL,		/* kill task on access violation */
 };

 enum profile_flags {
 	PFLAG_HAT = 1,			/* profile is a hat */
 	PFLAG_UNCONFINED = 2,		/* profile is an unconfined profile */
 	PFLAG_NULL = 4,			/* profile is null learning profile */
 	PFLAG_IX_ON_NAME_ERROR = 8,	/* fallback to ix on name lookup fail */
 	PFLAG_IMMUTABLE = 0x10,		/* don't allow changes/replacement */
 	PFLAG_USER_DEFINED = 0x20,	/* user based profile - lower privs */
 	PFLAG_NO_LIST_REF = 0x40,	/* list doesn't keep profile ref */
 	PFLAG_OLD_NULL_TRANS = 0x100,	/* use // as the null transition */

 	/* These flags must correspond with PATH_flags */
 	PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */
 };

 struct aa_profile;

 /* struct aa_policy - common part of both namespaces and profiles
  * @name: name of the object
  * @hname - The hierarchical name
  * @count: reference count of the obj
  * @list: list policy object is on
  * @profiles: head of the profiles list contained in the object
  */
 struct aa_policy {
 	char *name;
 	char *hname;
 	struct kref count;
 	struct list_head list;
 	struct list_head profiles;
 };

 /* 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_namespace - 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.
  *
  * An aa_namespace defines the set profiles that are searched to determine
  * which profile to attach to a task.  Profiles can not be shared between
  * aa_namespaces 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
  *
  * FIXME TODO: add vserver support of namespaces (can it all be done in
  *             userspace?)
  */
 struct aa_namespace {
 	struct aa_policy base;
 	struct aa_namespace *parent;
 	rwlock_t lock;
 	struct aa_ns_acct acct;
 	struct aa_profile *unconfined;
 	struct list_head sub_ns;
 };

 /* struct aa_profile - basic confinement data
  * @base - base components of the profile (name, refcount, lists, lock ...)
  * @parent: parent of profile
  * @ns: namespace the profile is in
  * @replacedby: is set to the profile that replaced this profile
  * @rename: optional profile name that this profile renamed
  * @xmatch: optional extended matching for unconfined executables names
  * @xmatch_len: xmatch prefix len, used to determine xmatch priority
  * @sid: the unique security id number of this profile
  * @audit: the auditing mode of the profile
  * @mode: the enforcement mode of the profile
  * @flags: flags controlling profile behavior
  * @path_flags: flags controlling path generation behavior
  * @size: the memory consumed by this profiles rules
  * @file: The set of rules governing basic file access and domain transitions
  * @caps: capabilities for the profile
  * @rlimits: rlimits for the profile
  *
  * The AppArmor profile contains the basic confinement data.  Each profile
  * has a name, and exists in a namespace.  The @name and @exec_match are
  * used to determine profile attachment against unconfined tasks.  All other
  * attachments are determined by profile X transition rules.
  *
  * The @replacedby field is write protected by the profile lock.  Reads
  * are assumed to be atomic, and are done without locking.
  *
  * Profiles have a hierarchy where hats and children profiles keep
  * a reference to their parent.
  *
  * Profile names can not begin with a : and can not contain the \0
  * character.  If a profile name begins with / it will be considered when
  * determining profile attachment on "unconfined" tasks.
  */
 struct aa_profile {
 	struct aa_policy base;
 	struct aa_profile *parent;

 	struct aa_namespace *ns;
 	struct aa_profile *replacedby;
 	const char *rename;

 	struct aa_dfa *xmatch;
 	int xmatch_len;
 	u32 sid;
 	enum audit_mode audit;
 	enum profile_mode mode;
 	u32 flags;
 	u32 path_flags;
 	int size;

 	struct aa_file_rules file;
 	struct aa_caps caps;
 	struct aa_rlimit rlimits;
 };

 extern struct aa_namespace *root_ns;
 extern enum profile_mode aa_g_profile_mode;

 void aa_add_profile(struct aa_policy *common, struct aa_profile *profile);

 bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view);
 const char *aa_ns_name(struct aa_namespace *parent, struct aa_namespace *child);
 int aa_alloc_root_ns(void);
 void aa_free_root_ns(void);
 void aa_free_namespace_kref(struct kref *kref);

 struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
 				       const char *name);

 static inline struct aa_policy *aa_get_common(struct aa_policy *c)
 {
 	if (c)
 		kref_get(&c->count);

 	return c;
 }

 /**
  * aa_get_namespace - 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_namespace *aa_get_namespace(struct aa_namespace *ns)
 {
 	if (ns)
 		kref_get(&(ns->base.count));

 	return ns;
 }

 /**
  * aa_put_namespace - 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_namespace(struct aa_namespace *ns)
 {
 	if (ns)
 		kref_put(&ns->base.count, aa_free_namespace_kref);
 }

 struct aa_profile *aa_alloc_profile(const char *name);
 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat);
 void aa_free_profile_kref(struct kref *kref);
 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
 struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *name);
 struct aa_profile *aa_match_profile(struct aa_namespace *ns, const char *name);

 ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace);
 ssize_t aa_remove_profiles(char *name, size_t size);

 #define PROF_ADD 1
 #define PROF_REPLACE 0

 #define unconfined(X) ((X)->flags & PFLAG_UNCONFINED)

 /**
  * aa_newest_version - find the newest version of @profile
  * @profile: the profile to check for newer versions of (NOT NULL)
  *
  * Returns: newest version of @profile, if @profile is the newest version
  *          return @profile.
  *
  * NOTE: the profile returned is not refcounted, The refcount on @profile
  * must be held until the caller decides what to do with the returned newest
  * version.
  */
 static inline struct aa_profile *aa_newest_version(struct aa_profile *profile)
 {
 	while (profile->replacedby)
 		profile = profile->replacedby;

 	return profile;
 }

 /**
  * aa_get_profile - increment refcount on profile @p
  * @p: profile  (MAYBE NULL)
  *
  * Returns: pointer to @p if @p is NULL will return NULL
  * Requires: @p must be held with valid refcount when called
  */
 static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
 {
 	if (p)
 		kref_get(&(p->base.count));

 	return p;
 }

 /**
  * aa_put_profile - decrement refcount on profile @p
  * @p: profile  (MAYBE NULL)
  */
 static inline void aa_put_profile(struct aa_profile *p)
 {
 	if (p)
 		kref_put(&p->base.count, aa_free_profile_kref);
 }

 static inline int AUDIT_MODE(struct aa_profile *profile)
 {
 	if (aa_g_audit != AUDIT_NORMAL)
 		return aa_g_audit;

 	return profile->audit;
 }

 bool aa_may_manage_policy(int op);

 #endif /* __AA_POLICY_H */
	/*
	* AppArmor security module
	*
	* This file contains AppArmor policy definitions.
	*
	* Copyright (C) 1998-2008 Novell/SUSE
	* Copyright 2009-2010 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_POLICY_H
	#define __AA_POLICY_H

	#include <linux/capability.h>
	#include <linux/cred.h>
	#include <linux/kref.h>
	#include <linux/sched.h>
	#include <linux/slab.h>
	#include <linux/socket.h>

	#include "apparmor.h"
	#include "audit.h"
	#include "capability.h"
	#include "domain.h"
	#include "file.h"
	#include "resource.h"

	extern const char *profile_mode_names[];
	#define APPARMOR_NAMES_MAX_INDEX 3

	#define COMPLAIN_MODE(_profile) \
	((aa_g_profile_mode == APPARMOR_COMPLAIN) \|\| \
	((_profile)->mode == APPARMOR_COMPLAIN))

	#define KILL_MODE(_profile) \
	((aa_g_profile_mode == APPARMOR_KILL) \|\| \
	((_profile)->mode == APPARMOR_KILL))

	#define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT)

	/*
	* FIXME: currently need a clean way to replace and remove profiles as a
	* set. It should be done at the namespace level.
	* Either, with a set of profiles loaded at the namespace level or via
	* a mark and remove marked interface.
	*/
	enum profile_mode {
	APPARMOR_ENFORCE, /* enforce access rules */
	APPARMOR_COMPLAIN, /* allow and log access violations */
	APPARMOR_KILL, /* kill task on access violation */
	};

	enum profile_flags {
	PFLAG_HAT = 1, /* profile is a hat */
	PFLAG_UNCONFINED = 2, /* profile is an unconfined profile */
	PFLAG_NULL = 4, /* profile is null learning profile */
	PFLAG_IX_ON_NAME_ERROR = 8, /* fallback to ix on name lookup fail */
	PFLAG_IMMUTABLE = 0x10, /* don't allow changes/replacement */
	PFLAG_USER_DEFINED = 0x20, /* user based profile - lower privs */
	PFLAG_NO_LIST_REF = 0x40, /* list doesn't keep profile ref */
	PFLAG_OLD_NULL_TRANS = 0x100, /* use // as the null transition */

	/* These flags must correspond with PATH_flags */
	PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */
	};

	struct aa_profile;

	/* struct aa_policy - common part of both namespaces and profiles
	* @name: name of the object
	* @hname - The hierarchical name
	* @count: reference count of the obj
	* @list: list policy object is on
	* @profiles: head of the profiles list contained in the object
	*/
	struct aa_policy {
	char *name;
	char *hname;
	struct kref count;
	struct list_head list;
	struct list_head profiles;
	};

	/* 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_namespace - 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.
	*
	* An aa_namespace defines the set profiles that are searched to determine
	* which profile to attach to a task. Profiles can not be shared between
	* aa_namespaces 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
	*
	* FIXME TODO: add vserver support of namespaces (can it all be done in
	* userspace?)
	*/
	struct aa_namespace {
	struct aa_policy base;
	struct aa_namespace *parent;
	rwlock_t lock;
	struct aa_ns_acct acct;
	struct aa_profile *unconfined;
	struct list_head sub_ns;
	};

	/* struct aa_profile - basic confinement data
	* @base - base components of the profile (name, refcount, lists, lock ...)
	* @parent: parent of profile
	* @ns: namespace the profile is in
	* @replacedby: is set to the profile that replaced this profile
	* @rename: optional profile name that this profile renamed
	* @xmatch: optional extended matching for unconfined executables names
	* @xmatch_len: xmatch prefix len, used to determine xmatch priority
	* @sid: the unique security id number of this profile
	* @audit: the auditing mode of the profile
	* @mode: the enforcement mode of the profile
	* @flags: flags controlling profile behavior
	* @path_flags: flags controlling path generation behavior
	* @size: the memory consumed by this profiles rules
	* @file: The set of rules governing basic file access and domain transitions
	* @caps: capabilities for the profile
	* @rlimits: rlimits for the profile
	*
	* The AppArmor profile contains the basic confinement data. Each profile
	* has a name, and exists in a namespace. The @name and @exec_match are
	* used to determine profile attachment against unconfined tasks. All other
	* attachments are determined by profile X transition rules.
	*
	* The @replacedby field is write protected by the profile lock. Reads
	* are assumed to be atomic, and are done without locking.
	*
	* Profiles have a hierarchy where hats and children profiles keep
	* a reference to their parent.
	*
	* Profile names can not begin with a : and can not contain the \0
	* character. If a profile name begins with / it will be considered when
	* determining profile attachment on "unconfined" tasks.
	*/
	struct aa_profile {
	struct aa_policy base;
	struct aa_profile *parent;

	struct aa_namespace *ns;
	struct aa_profile *replacedby;
	const char *rename;

	struct aa_dfa *xmatch;
	int xmatch_len;
	u32 sid;
	enum audit_mode audit;
	enum profile_mode mode;
	u32 flags;
	u32 path_flags;
	int size;

	struct aa_file_rules file;
	struct aa_caps caps;
	struct aa_rlimit rlimits;
	};

	extern struct aa_namespace *root_ns;
	extern enum profile_mode aa_g_profile_mode;

	void aa_add_profile(struct aa_policy common, struct aa_profile profile);

	bool aa_ns_visible(struct aa_namespace curr, struct aa_namespace view);
	const char aa_ns_name(struct aa_namespace parent, struct aa_namespace *child);
	int aa_alloc_root_ns(void);
	void aa_free_root_ns(void);
	void aa_free_namespace_kref(struct kref *kref);

	struct aa_namespace aa_find_namespace(struct aa_namespace root,
	const char *name);

	static inline struct aa_policy aa_get_common(struct aa_policy c)
	{
	if (c)
	kref_get(&c->count);

	return c;
	}

	/**
	* aa_get_namespace - 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_namespace aa_get_namespace(struct aa_namespace ns)
	{
	if (ns)
	kref_get(&(ns->base.count));

	return ns;
	}

	/**
	* aa_put_namespace - 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_namespace(struct aa_namespace *ns)
	{
	if (ns)
	kref_put(&ns->base.count, aa_free_namespace_kref);
	}

	struct aa_profile aa_alloc_profile(const char name);
	struct aa_profile aa_new_null_profile(struct aa_profile parent, int hat);
	void aa_free_profile_kref(struct kref *kref);
	struct aa_profile aa_find_child(struct aa_profile parent, const char *name);
	struct aa_profile aa_lookup_profile(struct aa_namespace ns, const char *name);
	struct aa_profile aa_match_profile(struct aa_namespace ns, const char *name);

	ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace);
	ssize_t aa_remove_profiles(char *name, size_t size);

	#define PROF_ADD 1
	#define PROF_REPLACE 0

	#define unconfined(X) ((X)->flags & PFLAG_UNCONFINED)

	/**
	* aa_newest_version - find the newest version of @profile
	* @profile: the profile to check for newer versions of (NOT NULL)
	*
	* Returns: newest version of @profile, if @profile is the newest version
	* return @profile.
	*
	* NOTE: the profile returned is not refcounted, The refcount on @profile
	* must be held until the caller decides what to do with the returned newest
	* version.
	*/
	static inline struct aa_profile aa_newest_version(struct aa_profile profile)
	{
	while (profile->replacedby)
	profile = profile->replacedby;

	return profile;
	}

	/**
	* aa_get_profile - increment refcount on profile @p
	* @p: profile (MAYBE NULL)
	*
	* Returns: pointer to @p if @p is NULL will return NULL
	* Requires: @p must be held with valid refcount when called
	*/
	static inline struct aa_profile aa_get_profile(struct aa_profile p)
	{
	if (p)
	kref_get(&(p->base.count));

	return p;
	}

	/**
	* aa_put_profile - decrement refcount on profile @p
	* @p: profile (MAYBE NULL)
	*/
	static inline void aa_put_profile(struct aa_profile *p)
	{
	if (p)
	kref_put(&p->base.count, aa_free_profile_kref);
	}

	static inline int AUDIT_MODE(struct aa_profile *profile)
	{
	if (aa_g_audit != AUDIT_NORMAL)
	return aa_g_audit;

	return profile->audit;
	}

	bool aa_may_manage_policy(int op);

	#endif /* __AA_POLICY_H */