238 строки
6.6 KiB
C
238 строки
6.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* AppArmor security module
|
|
*
|
|
* This file contains AppArmor file mediation function definitions.
|
|
*
|
|
* Copyright (C) 1998-2008 Novell/SUSE
|
|
* Copyright 2009-2010 Canonical Ltd.
|
|
*/
|
|
|
|
#ifndef __AA_FILE_H
|
|
#define __AA_FILE_H
|
|
|
|
#include <linux/spinlock.h>
|
|
|
|
#include "domain.h"
|
|
#include "match.h"
|
|
#include "perms.h"
|
|
|
|
struct aa_profile;
|
|
struct path;
|
|
|
|
#define mask_mode_t(X) (X & (MAY_EXEC | MAY_WRITE | MAY_READ | MAY_APPEND))
|
|
|
|
#define AA_AUDIT_FILE_MASK (MAY_READ | MAY_WRITE | MAY_EXEC | MAY_APPEND |\
|
|
AA_MAY_CREATE | AA_MAY_DELETE | \
|
|
AA_MAY_GETATTR | AA_MAY_SETATTR | \
|
|
AA_MAY_CHMOD | AA_MAY_CHOWN | AA_MAY_LOCK | \
|
|
AA_EXEC_MMAP | AA_MAY_LINK)
|
|
|
|
static inline struct aa_file_ctx *file_ctx(struct file *file)
|
|
{
|
|
return file->f_security + apparmor_blob_sizes.lbs_file;
|
|
}
|
|
|
|
/* struct aa_file_ctx - the AppArmor context the file was opened in
|
|
* @lock: lock to update the ctx
|
|
* @label: label currently cached on the ctx
|
|
* @perms: the permission the file was opened with
|
|
*/
|
|
struct aa_file_ctx {
|
|
spinlock_t lock;
|
|
struct aa_label __rcu *label;
|
|
u32 allow;
|
|
};
|
|
|
|
/**
|
|
* aa_alloc_file_ctx - allocate file_ctx
|
|
* @label: initial label of task creating the file
|
|
* @gfp: gfp flags for allocation
|
|
*
|
|
* Returns: file_ctx or NULL on failure
|
|
*/
|
|
static inline struct aa_file_ctx *aa_alloc_file_ctx(struct aa_label *label,
|
|
gfp_t gfp)
|
|
{
|
|
struct aa_file_ctx *ctx;
|
|
|
|
ctx = kzalloc(sizeof(struct aa_file_ctx), gfp);
|
|
if (ctx) {
|
|
spin_lock_init(&ctx->lock);
|
|
rcu_assign_pointer(ctx->label, aa_get_label(label));
|
|
}
|
|
return ctx;
|
|
}
|
|
|
|
/**
|
|
* aa_free_file_ctx - free a file_ctx
|
|
* @ctx: file_ctx to free (MAYBE_NULL)
|
|
*/
|
|
static inline void aa_free_file_ctx(struct aa_file_ctx *ctx)
|
|
{
|
|
if (ctx) {
|
|
aa_put_label(rcu_access_pointer(ctx->label));
|
|
kfree_sensitive(ctx);
|
|
}
|
|
}
|
|
|
|
static inline struct aa_label *aa_get_file_label(struct aa_file_ctx *ctx)
|
|
{
|
|
return aa_get_label_rcu(&ctx->label);
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
|
|
/* need to make conditional which ones are being set */
|
|
struct path_cond {
|
|
kuid_t uid;
|
|
umode_t mode;
|
|
};
|
|
|
|
#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 aa_perms *perms,
|
|
const char *op, u32 request, const char *name,
|
|
const char *target, struct aa_label *tlabel, 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 */
|
|
};
|
|
|
|
struct aa_perms aa_compute_fperms(struct aa_dfa *dfa, unsigned int state,
|
|
struct path_cond *cond);
|
|
unsigned int aa_str_perms(struct aa_dfa *dfa, unsigned int start,
|
|
const char *name, struct path_cond *cond,
|
|
struct aa_perms *perms);
|
|
|
|
int __aa_path_perm(const char *op, struct aa_profile *profile,
|
|
const char *name, u32 request, struct path_cond *cond,
|
|
int flags, struct aa_perms *perms);
|
|
int aa_path_perm(const char *op, struct aa_label *label,
|
|
const struct path *path, int flags, u32 request,
|
|
struct path_cond *cond);
|
|
|
|
int aa_path_link(struct aa_label *label, struct dentry *old_dentry,
|
|
const struct path *new_dir, struct dentry *new_dentry);
|
|
|
|
int aa_file_perm(const char *op, struct aa_label *label, struct file *file,
|
|
u32 request, bool in_atomic);
|
|
|
|
void aa_inherit_files(const struct cred *cred, struct files_struct *files);
|
|
|
|
static inline void aa_free_file_rules(struct aa_file_rules *rules)
|
|
{
|
|
aa_put_dfa(rules->dfa);
|
|
aa_free_domain_entries(&rules->trans);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
#endif /* __AA_FILE_H */
|