security/apparmor/include/policy.h - third_party/linux - 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/rhashtable.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 "lib.h"
 #include "label.h"
 #include "net.h"
 #include "perms.h"
 #include "resource.h"


 struct aa_ns;

 extern int unprivileged_userns_apparmor_policy;

 extern const char *const aa_profile_mode_names[];
 #define APPARMOR_MODE_NAMES_MAX_INDEX 4

 #define PROFILE_MODE(_profile, _mode)		\
 	((aa_g_profile_mode == (_mode)) ||	\
 	 ((_profile)->mode == (_mode)))

 #define COMPLAIN_MODE(_profile)	PROFILE_MODE((_profile), APPARMOR_COMPLAIN)

 #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)

 #define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT)

 #define profile_is_stale(_profile) (label_is_stale(&(_profile)->label))

 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)

 /*
  * 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 */
 	APPARMOR_UNCONFINED,	/* profile set to unconfined */
 };


 /* struct aa_policydb - match engine for a policy
  * dfa: dfa pattern match
  * start: set of start states for the different classes of data
  */
 struct aa_policydb {
 	/* Generic policy DFA specific rule types will be subsections of it */
 	struct aa_dfa *dfa;
 	unsigned int start[AA_CLASS_LAST + 1];

 };

 /* struct aa_data - generic data structure
  * key: name for retrieving this data
  * size: size of data in bytes
  * data: binary data
  * head: reserved for rhashtable
  */
 struct aa_data {
 	char *key;
 	u32 size;
 	char *data;
 	struct rhash_head head;
 };


 /* struct aa_profile - basic confinement data
  * @base - base components of the profile (name, refcount, lists, lock ...)
  * @label - label this profile is an extension of
  * @parent: parent of profile
  * @ns: namespace the profile is in
  * @rename: optional profile name that this profile renamed
  * @attach: human readable attachment string
  * @xmatch: optional extended matching for unconfined executables names
  * @xmatch_len: xmatch prefix len, used to determine xmatch priority
  * @audit: the auditing mode of the profile
  * @mode: the enforcement mode of the profile
  * @path_flags: flags controlling path generation behavior
  * @disconnected: what to prepend if attach_disconnected is specified
  * @size: the memory consumed by this profiles rules
  * @policy: general match rules governing policy
  * @file: The set of rules governing basic file access and domain transitions
  * @caps: capabilities for the profile
  * @rlimits: rlimits for the profile
  *
  * @dents: dentries for the profiles file entries in apparmorfs
  * @dirname: name of the profile dir in apparmorfs
  * @data: hashtable for free-form policy aa_data
  *
  * 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.
  *
  * 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 __rcu *parent;

 	struct aa_ns *ns;
 	const char *rename;

 	const char *attach;
 	struct aa_dfa *xmatch;
 	int xmatch_len;
 	enum audit_mode audit;
 	long mode;
 	u32 path_flags;
 	const char *disconnected;
 	int size;

 	struct aa_policydb policy;
 	struct aa_file_rules file;
 	struct aa_caps caps;

 	int xattr_count;
 	char **xattrs;

 	struct aa_rlimit rlimits;

 	struct aa_loaddata *rawdata;
 	unsigned char *hash;
 	char *dirname;
 	struct dentry *dents[AAFS_PROF_SIZEOF];
 	struct rhashtable *data;
 	struct aa_label label;
 };

 extern enum profile_mode aa_g_profile_mode;

 #define AA_MAY_LOAD_POLICY	AA_MAY_APPEND
 #define AA_MAY_REPLACE_POLICY	AA_MAY_WRITE
 #define AA_MAY_REMOVE_POLICY	AA_MAY_DELETE

 #define profiles_ns(P) ((P)->ns)
 #define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname)

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


 void aa_free_proxy_kref(struct kref *kref);
 struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy,
 				    gfp_t gfp);
 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat,
 				       const char *base, gfp_t gfp);
 void aa_free_profile(struct aa_profile *profile);
 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_lookupn_profile(struct aa_ns *ns, const char *hname,
 				      size_t n);
 struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name);
 struct aa_profile *aa_fqlookupn_profile(struct aa_label *base,
 					const char *fqname, size_t n);
 struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name);

 ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label,
 			    u32 mask, struct aa_loaddata *udata);
 ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label,
 			   char *name, size_t size);
 void __aa_profile_list_release(struct list_head *head);

 #define PROF_ADD 1
 #define PROF_REPLACE 0

 #define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)

 /**
  * aa_get_newest_profile - simple wrapper fn to wrap the label version
  * @p: profile (NOT NULL)
  *
  * Returns refcount to newest version of the profile (maybe @p)
  *
  * Requires: @p must be held with a valid refcount
  */
 static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
 {
 	return labels_profile(aa_get_newest_label(&p->label));
 }

 #define PROFILE_MEDIATES(P, T)  ((P)->policy.start[(unsigned char) (T)])
 static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile,
 					       u16 AF) {
 	unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
 	__be16 be_af = cpu_to_be16(AF);

 	if (!state)
 		return 0;
 	return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2);
 }

 /**
  * 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->label.count));

 	return p;
 }

 /**
  * aa_get_profile_not0 - increment refcount on profile @p found via lookup
  * @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_not0(struct aa_profile *p)
 {
 	if (p && kref_get_unless_zero(&p->label.count))
 		return p;

 	return NULL;
 }

 /**
  * aa_get_profile_rcu - increment a refcount profile that can be replaced
  * @p: pointer to profile that can be replaced (NOT NULL)
  *
  * Returns: pointer to a refcounted profile.
  *     else NULL if no profile
  */
 static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
 {
 	struct aa_profile *c;

 	rcu_read_lock();
 	do {
 		c = rcu_dereference(*p);
 	} while (c && !kref_get_unless_zero(&c->label.count));
 	rcu_read_unlock();

 	return c;
 }

 /**
  * 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->label.count, aa_label_kref);
 }

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

 	return profile->audit;
 }

 bool policy_view_capable(struct aa_ns *ns);
 bool policy_admin_capable(struct aa_ns *ns);
 int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns,
 			 u32 mask);

 #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/rhashtable.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 "lib.h"
	#include "label.h"
	#include "net.h"
	#include "perms.h"
	#include "resource.h"


	struct aa_ns;

	extern int unprivileged_userns_apparmor_policy;

	extern const char *const aa_profile_mode_names[];
	#define APPARMOR_MODE_NAMES_MAX_INDEX 4

	#define PROFILE_MODE(_profile, _mode) \
	((aa_g_profile_mode == (_mode)) \|\| \
	((_profile)->mode == (_mode)))

	#define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN)

	#define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)

	#define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT)

	#define profile_is_stale(_profile) (label_is_stale(&(_profile)->label))

	#define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)

	/*
	* 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 */
	APPARMOR_UNCONFINED, /* profile set to unconfined */
	};


	/* struct aa_policydb - match engine for a policy
	* dfa: dfa pattern match
	* start: set of start states for the different classes of data
	*/
	struct aa_policydb {
	/* Generic policy DFA specific rule types will be subsections of it */
	struct aa_dfa *dfa;
	unsigned int start[AA_CLASS_LAST + 1];

	};

	/* struct aa_data - generic data structure
	* key: name for retrieving this data
	* size: size of data in bytes
	* data: binary data
	* head: reserved for rhashtable
	*/
	struct aa_data {
	char *key;
	u32 size;
	char *data;
	struct rhash_head head;
	};


	/* struct aa_profile - basic confinement data
	* @base - base components of the profile (name, refcount, lists, lock ...)
	* @label - label this profile is an extension of
	* @parent: parent of profile
	* @ns: namespace the profile is in
	* @rename: optional profile name that this profile renamed
	* @attach: human readable attachment string
	* @xmatch: optional extended matching for unconfined executables names
	* @xmatch_len: xmatch prefix len, used to determine xmatch priority
	* @audit: the auditing mode of the profile
	* @mode: the enforcement mode of the profile
	* @path_flags: flags controlling path generation behavior
	* @disconnected: what to prepend if attach_disconnected is specified
	* @size: the memory consumed by this profiles rules
	* @policy: general match rules governing policy
	* @file: The set of rules governing basic file access and domain transitions
	* @caps: capabilities for the profile
	* @rlimits: rlimits for the profile
	*
	* @dents: dentries for the profiles file entries in apparmorfs
	* @dirname: name of the profile dir in apparmorfs
	* @data: hashtable for free-form policy aa_data
	*
	* 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.
	*
	* 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 __rcu *parent;

	struct aa_ns *ns;
	const char *rename;

	const char *attach;
	struct aa_dfa *xmatch;
	int xmatch_len;
	enum audit_mode audit;
	long mode;
	u32 path_flags;
	const char *disconnected;
	int size;

	struct aa_policydb policy;
	struct aa_file_rules file;
	struct aa_caps caps;

	int xattr_count;
	char **xattrs;

	struct aa_rlimit rlimits;

	struct aa_loaddata *rawdata;
	unsigned char *hash;
	char *dirname;
	struct dentry *dents[AAFS_PROF_SIZEOF];
	struct rhashtable *data;
	struct aa_label label;
	};

	extern enum profile_mode aa_g_profile_mode;

	#define AA_MAY_LOAD_POLICY AA_MAY_APPEND
	#define AA_MAY_REPLACE_POLICY AA_MAY_WRITE
	#define AA_MAY_REMOVE_POLICY AA_MAY_DELETE

	#define profiles_ns(P) ((P)->ns)
	#define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname)

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


	void aa_free_proxy_kref(struct kref *kref);
	struct aa_profile aa_alloc_profile(const char name, struct aa_proxy *proxy,
	gfp_t gfp);
	struct aa_profile aa_new_null_profile(struct aa_profile parent, bool hat,
	const char *base, gfp_t gfp);
	void aa_free_profile(struct aa_profile *profile);
	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_lookupn_profile(struct aa_ns ns, const char *hname,
	size_t n);
	struct aa_profile aa_lookup_profile(struct aa_ns ns, const char *name);
	struct aa_profile aa_fqlookupn_profile(struct aa_label base,
	const char *fqname, size_t n);
	struct aa_profile aa_match_profile(struct aa_ns ns, const char *name);

	ssize_t aa_replace_profiles(struct aa_ns view, struct aa_label label,
	u32 mask, struct aa_loaddata *udata);
	ssize_t aa_remove_profiles(struct aa_ns view, struct aa_label label,
	char *name, size_t size);
	void __aa_profile_list_release(struct list_head *head);

	#define PROF_ADD 1
	#define PROF_REPLACE 0

	#define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)

	/**
	* aa_get_newest_profile - simple wrapper fn to wrap the label version
	* @p: profile (NOT NULL)
	*
	* Returns refcount to newest version of the profile (maybe @p)
	*
	* Requires: @p must be held with a valid refcount
	*/
	static inline struct aa_profile aa_get_newest_profile(struct aa_profile p)
	{
	return labels_profile(aa_get_newest_label(&p->label));
	}

	#define PROFILE_MEDIATES(P, T) ((P)->policy.start[(unsigned char) (T)])
	static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile,
	u16 AF) {
	unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
	__be16 be_af = cpu_to_be16(AF);

	if (!state)
	return 0;
	return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2);
	}

	/**
	* 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->label.count));

	return p;
	}

	/**
	* aa_get_profile_not0 - increment refcount on profile @p found via lookup
	* @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_not0(struct aa_profile p)
	{
	if (p && kref_get_unless_zero(&p->label.count))
	return p;

	return NULL;
	}

	/**
	* aa_get_profile_rcu - increment a refcount profile that can be replaced
	* @p: pointer to profile that can be replaced (NOT NULL)
	*
	* Returns: pointer to a refcounted profile.
	* else NULL if no profile
	*/
	static inline struct aa_profile aa_get_profile_rcu(struct aa_profile __rcu *p)
	{
	struct aa_profile *c;

	rcu_read_lock();
	do {
	c = rcu_dereference(*p);
	} while (c && !kref_get_unless_zero(&c->label.count));
	rcu_read_unlock();

	return c;
	}

	/**
	* 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->label.count, aa_label_kref);
	}

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

	return profile->audit;
	}

	bool policy_view_capable(struct aa_ns *ns);
	bool policy_admin_capable(struct aa_ns *ns);
	int aa_may_manage_policy(struct aa_label label, struct aa_ns ns,
	u32 mask);

	#endif /* __AA_POLICY_H */