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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* AppArmor security module
*
* This file contains AppArmor policy loading interface function definitions.
*
* Copyright (C) 1998-2008 Novell/SUSE
* Copyright 2009-2010 Canonical Ltd.
*/
#ifndef __POLICY_INTERFACE_H
#define __POLICY_INTERFACE_H
#include <linux/list.h>
#include <linux/kref.h>
#include <linux/dcache.h>
#include <linux/workqueue.h>
struct aa_load_ent {
struct list_head list;
struct aa_profile *new;
struct aa_profile *old;
struct aa_profile *rename;
const char *ns_name;
};
void aa_load_ent_free(struct aa_load_ent *ent);
struct aa_load_ent *aa_load_ent_alloc(void);
#define PACKED_FLAG_HAT 1
#define PACKED_FLAG_DEBUG1 2
#define PACKED_FLAG_DEBUG2 4
#define PACKED_MODE_ENFORCE 0
#define PACKED_MODE_COMPLAIN 1
#define PACKED_MODE_KILL 2
#define PACKED_MODE_UNCONFINED 3
struct aa_ns;
enum {
AAFS_LOADDATA_ABI = 0,
AAFS_LOADDATA_REVISION,
AAFS_LOADDATA_HASH,
AAFS_LOADDATA_DATA,
AAFS_LOADDATA_COMPRESSED_SIZE,
AAFS_LOADDATA_DIR, /* must be last actual entry */
AAFS_LOADDATA_NDENTS /* count of entries */
};
/*
* The AppArmor interface treats data as a type byte followed by the
* actual data. The interface has the notion of a named entry
* which has a name (AA_NAME typecode followed by name string) followed by
* the entries typecode and data. Named types allow for optional
* elements and extensions to be added and tested for without breaking
* backwards compatibility.
*/
enum aa_code {
AA_U8,
AA_U16,
AA_U32,
AA_U64,
AA_NAME, /* same as string except it is items name */
AA_STRING,
AA_BLOB,
AA_STRUCT,
AA_STRUCTEND,
AA_LIST,
AA_LISTEND,
AA_ARRAY,
AA_ARRAYEND,
};
/*
* aa_ext is the read of the buffer containing the serialized profile. The
* data is copied into a kernel buffer in apparmorfs and then handed off to
* the unpack routines.
*/
struct aa_ext {
void *start;
void *end;
void *pos; /* pointer to current position in the buffer */
u32 version;
};
/*
* struct aa_loaddata - buffer of policy raw_data set
*
* there is no loaddata ref for being on ns list, nor a ref from
* d_inode(@dentry) when grab a ref from these, @ns->lock must be held
* && __aa_get_loaddata() needs to be used, and the return value
* checked, if NULL the loaddata is already being reaped and should be
* considered dead.
*/
struct aa_loaddata {
struct kref count;
struct list_head list;
struct work_struct work;
struct dentry *dents[AAFS_LOADDATA_NDENTS];
struct aa_ns *ns;
char *name;
size_t size; /* the original size of the payload */
size_t compressed_size; /* the compressed size of the payload */
long revision; /* the ns policy revision this caused */
int abi;
unsigned char *hash;
/* Pointer to payload. If @compressed_size > 0, then this is the
* compressed version of the payload, else it is the uncompressed
* version (with the size indicated by @size).
*/
char *data;
};
int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);
/**
* __aa_get_loaddata - get a reference count to uncounted data reference
* @data: reference to get a count on
*
* Returns: pointer to reference OR NULL if race is lost and reference is
* being repeated.
* Requires: @data->ns->lock held, and the return code MUST be checked
*
* Use only from inode->i_private and @data->list found references
*/
static inline struct aa_loaddata *
__aa_get_loaddata(struct aa_loaddata *data)
{
if (data && kref_get_unless_zero(&(data->count)))
return data;
return NULL;
}
/**
* aa_get_loaddata - get a reference count from a counted data reference
* @data: reference to get a count on
*
* Returns: point to reference
* Requires: @data to have a valid reference count on it. It is a bug
* if the race to reap can be encountered when it is used.
*/
static inline struct aa_loaddata *
aa_get_loaddata(struct aa_loaddata *data)
{
struct aa_loaddata *tmp = __aa_get_loaddata(data);
AA_BUG(data && !tmp);
return tmp;
}
void __aa_loaddata_update(struct aa_loaddata *data, long revision);
bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
void aa_loaddata_kref(struct kref *kref);
struct aa_loaddata *aa_loaddata_alloc(size_t size);
static inline void aa_put_loaddata(struct aa_loaddata *data)
{
if (data)
kref_put(&data->count, aa_loaddata_kref);
}
#if IS_ENABLED(CONFIG_KUNIT)
bool aa_inbounds(struct aa_ext *e, size_t size);
size_t aa_unpack_u16_chunk(struct aa_ext *e, char **chunk);
bool aa_unpack_X(struct aa_ext *e, enum aa_code code);
bool aa_unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name);
bool aa_unpack_u32(struct aa_ext *e, u32 *data, const char *name);
bool aa_unpack_u64(struct aa_ext *e, u64 *data, const char *name);
size_t aa_unpack_array(struct aa_ext *e, const char *name);
size_t aa_unpack_blob(struct aa_ext *e, char **blob, const char *name);
int aa_unpack_str(struct aa_ext *e, const char **string, const char *name);
int aa_unpack_strdup(struct aa_ext *e, char **string, const char *name);
#endif
#endif /* __POLICY_INTERFACE_H */
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