security/apparmor/include/file.h - kernel/msm-4.9 - Gitiles

 /*
  * AppArmor security module
  *
  * This file contains AppArmor file mediation function 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_FILE_H
 #define __AA_FILE_H

 #include "domain.h"
 #include "match.h"

 struct aa_profile;
 struct path;

 /*
  * We use MAY_EXEC, MAY_WRITE, MAY_READ, MAY_APPEND and the following flags
  * for profile permissions
  */
 #define AA_MAY_CREATE                  0x0010
 #define AA_MAY_DELETE                  0x0020
 #define AA_MAY_META_WRITE              0x0040
 #define AA_MAY_META_READ               0x0080

 #define AA_MAY_CHMOD                   0x0100
 #define AA_MAY_CHOWN                   0x0200
 #define AA_MAY_LOCK                    0x0400
 #define AA_EXEC_MMAP                   0x0800

 #define AA_MAY_LINK			0x1000
 #define AA_LINK_SUBSET			AA_MAY_LOCK	/* overlaid */
 #define AA_MAY_ONEXEC			0x40000000	/* exec allows onexec */
 #define AA_MAY_CHANGE_PROFILE		0x80000000
 #define AA_MAY_CHANGEHAT		0x80000000	/* ctrl auditing only */

 #define AA_AUDIT_FILE_MASK	(MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\
 				 AA_MAY_CREATE | AA_MAY_DELETE |	\
 				 AA_MAY_META_READ | AA_MAY_META_WRITE | \
 				 AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
 				 AA_EXEC_MMAP | AA_MAY_LINK)

 /*
  * The xindex is broken into 3 parts
  * - index - an index into either the exec name table or the variable table
  * - exec type - which determines how the executable name and index are used
  * - flags - which modify how the destination name is applied
  */
 #define AA_X_INDEX_MASK		0x03ff

 #define AA_X_TYPE_MASK		0x0c00
 #define AA_X_TYPE_SHIFT		10
 #define AA_X_NONE		0x0000
 #define AA_X_NAME		0x0400	/* use executable name px */
 #define AA_X_TABLE		0x0800	/* use a specified name ->n# */

 #define AA_X_UNSAFE		0x1000
 #define AA_X_CHILD		0x2000	/* make >AA_X_NONE apply to children */
 #define AA_X_INHERIT		0x4000
 #define AA_X_UNCONFINED		0x8000

 /* AA_SECURE_X_NEEDED - is passed in the bprm->unsafe field */
 #define AA_SECURE_X_NEEDED	0x8000

 /* need to make conditional which ones are being set */
 struct path_cond {
 	kuid_t uid;
 	umode_t mode;
 };

 /* struct file_perms - file permission
  * @allow: mask of permissions that are allowed
  * @audit: mask of permissions to force an audit message for
  * @quiet: mask of permissions to quiet audit messages for
  * @kill: mask of permissions that when matched will kill the task
  * @xindex: exec transition index if @allow contains MAY_EXEC
  *
  * The @audit and @queit mask should be mutually exclusive.
  */
 struct file_perms {
 	u32 allow;
 	u32 audit;
 	u32 quiet;
 	u32 kill;
 	u16 xindex;
 };

 extern struct file_perms nullperms;

 #define COMBINED_PERM_MASK(X) ((X).allow | (X).audit | (X).quiet | (X).kill)

 /* FIXME: split perms from dfa and match this to description
  *        also add delegation info.
  */
 static inline u16 dfa_map_xindex(u16 mask)
 {
 	u16 old_index = (mask >> 10) & 0xf;
 	u16 index = 0;

 	if (mask & 0x100)
 		index |= AA_X_UNSAFE;
 	if (mask & 0x200)
 		index |= AA_X_INHERIT;
 	if (mask & 0x80)
 		index |= AA_X_UNCONFINED;

 	if (old_index == 1) {
 		index |= AA_X_UNCONFINED;
 	} else if (old_index == 2) {
 		index |= AA_X_NAME;
 	} else if (old_index == 3) {
 		index |= AA_X_NAME | AA_X_CHILD;
 	} else if (old_index) {
 		index |= AA_X_TABLE;
 		index |= old_index - 4;
 	}

 	return index;
 }

 /*
  * map old dfa inline permissions to new format
  */
 #define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) | \
 				    ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
 #define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f)
 #define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f)
 #define dfa_user_xindex(dfa, state) \
 	(dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff))

 #define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \
 				      0x7f) |				\
 				     ((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
 #define dfa_other_audit(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 14) & 0x7f)
 #define dfa_other_quiet(dfa, state) \
 	((((ACCEPT_TABLE2(dfa)[state]) >> 7) >> 14) & 0x7f)
 #define dfa_other_xindex(dfa, state) \
 	dfa_map_xindex((ACCEPT_TABLE(dfa)[state] >> 14) & 0x3fff)

 int aa_audit_file(struct aa_profile *profile, struct file_perms *perms,
 		  gfp_t gfp, int op, u32 request, const char *name,
 		  const char *target, kuid_t ouid, const char *info, int error);

 /**
  * struct aa_file_rules - components used for file rule permissions
  * @dfa: dfa to match path names and conditionals against
  * @perms: permission table indexed by the matched state accept entry of @dfa
  * @trans: transition table for indexed by named x transitions
  *
  * File permission are determined by matching a path against @dfa and then
  * then using the value of the accept entry for the matching state as
  * an index into @perms.  If a named exec transition is required it is
  * looked up in the transition table.
  */
 struct aa_file_rules {
 	unsigned int start;
 	struct aa_dfa *dfa;
 	/* struct perms perms; */
 	struct aa_domain trans;
 	/* TODO: add delegate table */
 };

 unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,
 			  const char *name, struct path_cond *cond,
 			  struct file_perms *perms);

 int aa_path_perm(int op, struct aa_profile *profile, struct path *path,
 		 int flags, u32 request, struct path_cond *cond);

 int aa_path_link(struct aa_profile *profile, struct dentry *old_dentry,
 		 struct path *new_dir, struct dentry *new_dentry);

 int aa_file_perm(int op, struct aa_profile *profile, struct file *file,
 		 u32 request);

 static inline void aa_free_file_rules(struct aa_file_rules *rules)
 {
 	aa_put_dfa(rules->dfa);
 	aa_free_domain_entries(&rules->trans);
 }

 #define ACC_FMODE(x) (("\000\004\002\006"[(x)&O_ACCMODE]) | (((x) << 1) & 0x40))

 /* from namei.c */
 #define MAP_OPEN_FLAGS(x) ((((x) + 1) & O_ACCMODE) ? (x) + 1 : (x))

 /**
  * aa_map_file_perms - map file flags to AppArmor permissions
  * @file: open file to map flags to AppArmor permissions
  *
  * Returns: apparmor permission set for the file
  */
 static inline u32 aa_map_file_to_perms(struct file *file)
 {
 	int flags = MAP_OPEN_FLAGS(file->f_flags);
 	u32 perms = ACC_FMODE(file->f_mode);

 	if ((flags & O_APPEND) && (perms & MAY_WRITE))
 		perms = (perms & ~MAY_WRITE) | MAY_APPEND;
 	/* trunc implies write permission */
 	if (flags & O_TRUNC)
 		perms |= MAY_WRITE;
 	if (flags & O_CREAT)
 		perms |= AA_MAY_CREATE;

 	return perms;
 }

 #endif /* __AA_FILE_H */
	/*
	* AppArmor security module
	*
	* This file contains AppArmor file mediation function 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_FILE_H
	#define __AA_FILE_H

	#include "domain.h"
	#include "match.h"

	struct aa_profile;
	struct path;

	/*
	* We use MAY_EXEC, MAY_WRITE, MAY_READ, MAY_APPEND and the following flags
	* for profile permissions
	*/
	#define AA_MAY_CREATE 0x0010
	#define AA_MAY_DELETE 0x0020
	#define AA_MAY_META_WRITE 0x0040
	#define AA_MAY_META_READ 0x0080

	#define AA_MAY_CHMOD 0x0100
	#define AA_MAY_CHOWN 0x0200
	#define AA_MAY_LOCK 0x0400
	#define AA_EXEC_MMAP 0x0800

	#define AA_MAY_LINK 0x1000
	#define AA_LINK_SUBSET AA_MAY_LOCK /* overlaid */
	#define AA_MAY_ONEXEC 0x40000000 /* exec allows onexec */
	#define AA_MAY_CHANGE_PROFILE 0x80000000
	#define AA_MAY_CHANGEHAT 0x80000000 /* ctrl auditing only */

	#define AA_AUDIT_FILE_MASK (MAY_READ \| MAY_WRITE \| MAY_EXEC \| MAY_APPEND \|\
	AA_MAY_CREATE \| AA_MAY_DELETE \| \
	AA_MAY_META_READ \| AA_MAY_META_WRITE \| \
	AA_MAY_CHMOD \| AA_MAY_CHOWN \| AA_MAY_LOCK \| \
	AA_EXEC_MMAP \| AA_MAY_LINK)

	/*
	* The xindex is broken into 3 parts
	* - index - an index into either the exec name table or the variable table
	* - exec type - which determines how the executable name and index are used
	* - flags - which modify how the destination name is applied
	*/
	#define AA_X_INDEX_MASK 0x03ff

	#define AA_X_TYPE_MASK 0x0c00
	#define AA_X_TYPE_SHIFT 10
	#define AA_X_NONE 0x0000
	#define AA_X_NAME 0x0400 /* use executable name px */
	#define AA_X_TABLE 0x0800 /* use a specified name ->n# */

	#define AA_X_UNSAFE 0x1000
	#define AA_X_CHILD 0x2000 /* make >AA_X_NONE apply to children */
	#define AA_X_INHERIT 0x4000
	#define AA_X_UNCONFINED 0x8000

	/* AA_SECURE_X_NEEDED - is passed in the bprm->unsafe field */
	#define AA_SECURE_X_NEEDED 0x8000

	/* need to make conditional which ones are being set */
	struct path_cond {
	kuid_t uid;
	umode_t mode;
	};

	/* struct file_perms - file permission
	* @allow: mask of permissions that are allowed
	* @audit: mask of permissions to force an audit message for
	* @quiet: mask of permissions to quiet audit messages for
	* @kill: mask of permissions that when matched will kill the task
	* @xindex: exec transition index if @allow contains MAY_EXEC
	*
	* The @audit and @queit mask should be mutually exclusive.
	*/
	struct file_perms {
	u32 allow;
	u32 audit;
	u32 quiet;
	u32 kill;
	u16 xindex;
	};

	extern struct file_perms nullperms;

	#define COMBINED_PERM_MASK(X) ((X).allow \| (X).audit \| (X).quiet \| (X).kill)

	/* FIXME: split perms from dfa and match this to description
	* also add delegation info.
	*/
	static inline u16 dfa_map_xindex(u16 mask)
	{
	u16 old_index = (mask >> 10) & 0xf;
	u16 index = 0;

	if (mask & 0x100)
	index \|= AA_X_UNSAFE;
	if (mask & 0x200)
	index \|= AA_X_INHERIT;
	if (mask & 0x80)
	index \|= AA_X_UNCONFINED;

	if (old_index == 1) {
	index \|= AA_X_UNCONFINED;
	} else if (old_index == 2) {
	index \|= AA_X_NAME;
	} else if (old_index == 3) {
	index \|= AA_X_NAME \| AA_X_CHILD;
	} else if (old_index) {
	index \|= AA_X_TABLE;
	index \|= old_index - 4;
	}

	return index;
	}

	/*
	* map old dfa inline permissions to new format
	*/
	#define dfa_user_allow(dfa, state) (((ACCEPT_TABLE(dfa)[state]) & 0x7f) \| \
	((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
	#define dfa_user_audit(dfa, state) ((ACCEPT_TABLE2(dfa)[state]) & 0x7f)
	#define dfa_user_quiet(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 7) & 0x7f)
	#define dfa_user_xindex(dfa, state) \
	(dfa_map_xindex(ACCEPT_TABLE(dfa)[state] & 0x3fff))

	#define dfa_other_allow(dfa, state) ((((ACCEPT_TABLE(dfa)[state]) >> 14) & \
	0x7f) \| \
	((ACCEPT_TABLE(dfa)[state]) & 0x80000000))
	#define dfa_other_audit(dfa, state) (((ACCEPT_TABLE2(dfa)[state]) >> 14) & 0x7f)
	#define dfa_other_quiet(dfa, state) \
	((((ACCEPT_TABLE2(dfa)[state]) >> 7) >> 14) & 0x7f)
	#define dfa_other_xindex(dfa, state) \
	dfa_map_xindex((ACCEPT_TABLE(dfa)[state] >> 14) & 0x3fff)

	int aa_audit_file(struct aa_profile profile, struct file_perms perms,
	gfp_t gfp, int op, u32 request, const char *name,
	const char target, kuid_t ouid, const char info, int error);

	/**
	* struct aa_file_rules - components used for file rule permissions
	* @dfa: dfa to match path names and conditionals against
	* @perms: permission table indexed by the matched state accept entry of @dfa
	* @trans: transition table for indexed by named x transitions
	*
	* File permission are determined by matching a path against @dfa and then
	* then using the value of the accept entry for the matching state as
	* an index into @perms. If a named exec transition is required it is
	* looked up in the transition table.
	*/
	struct aa_file_rules {
	unsigned int start;
	struct aa_dfa *dfa;
	/* struct perms perms; */
	struct aa_domain trans;
	/* TODO: add delegate table */
	};

	unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,
	const char name, struct path_cond cond,
	struct file_perms *perms);

	int aa_path_perm(int op, struct aa_profile profile, struct path path,
	int flags, u32 request, struct path_cond *cond);

	int aa_path_link(struct aa_profile profile, struct dentry old_dentry,
	struct path new_dir, struct dentry new_dentry);

	int aa_file_perm(int op, struct aa_profile profile, struct file file,
	u32 request);

	static inline void aa_free_file_rules(struct aa_file_rules *rules)
	{
	aa_put_dfa(rules->dfa);
	aa_free_domain_entries(&rules->trans);
	}

	#define ACC_FMODE(x) (("\000\004\002\006"[(x)&O_ACCMODE]) \| (((x) << 1) & 0x40))

	/* from namei.c */
	#define MAP_OPEN_FLAGS(x) ((((x) + 1) & O_ACCMODE) ? (x) + 1 : (x))

	/**
	* aa_map_file_perms - map file flags to AppArmor permissions
	* @file: open file to map flags to AppArmor permissions
	*
	* Returns: apparmor permission set for the file
	*/
	static inline u32 aa_map_file_to_perms(struct file *file)
	{
	int flags = MAP_OPEN_FLAGS(file->f_flags);
	u32 perms = ACC_FMODE(file->f_mode);

	if ((flags & O_APPEND) && (perms & MAY_WRITE))
	perms = (perms & ~MAY_WRITE) \| MAY_APPEND;
	/* trunc implies write permission */
	if (flags & O_TRUNC)
	perms \|= MAY_WRITE;
	if (flags & O_CREAT)
	perms \|= AA_MAY_CREATE;

	return perms;
	}

	#endif /* __AA_FILE_H */