217 lines
6.5 KiB
C
217 lines
6.5 KiB
C
/*
|
|
* 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 {
|
|
uid_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 {
|
|
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, uid_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 */
|