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Release 4.11 security/apparmor/include/file.h

Directory: security/apparmor/include
/*
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
John Johansen116100.00%2100.00%


Total116100.00%2100.00%



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

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

int aa_file_perm(const char *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);
}


Contributors
PersonTokensPropCommitsCommitProp
John Johansen27100.00%1100.00%


Total27100.00%1100.00%



/**
 * 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 = file->f_flags;
	u32 perms = 0;

	if (file->f_mode & FMODE_WRITE)
		perms |= MAY_WRITE;
	if (file->f_mode & FMODE_READ)
		perms |= MAY_READ;

	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;
}


Contributors
PersonTokensPropCommitsCommitProp
John Johansen97100.00%2100.00%


Total97100.00%2100.00%



#endif /* __AA_FILE_H */

Overall Contributors
PersonTokensPropCommitsCommitProp
John Johansen65898.95%450.00%


Alexey Dobriyan30.45%112.50%


Al Viro20.30%225.00%


Eric W. Biedermann20.30%112.50%


Total665100.00%8100.00%


Directory: security/apparmor/include



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