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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _OS_MAC_H_
#define _OS_MAC_H_ 1
#include <sys/types.h>
#include <sys/mac.h>
/* Forward declarations */
struct mac_border;
struct proc;
/*
* MAC levels
*
* Processes or users with lower levels cannot
* access higher levels, higher levels can access
* lower levels.
*/
typedef enum {
MAC_GLOBAL,
MAC_RESTRICTED,
MAC_SECRET
} mac_level_t;
/*
* Mapping arguments for MAC
*
* @off: Mapping offset
* @len: Mapping length
* @flags: Optional flags
* @dp_res: Data pointer result written here
*/
struct mac_map_args {
off_t off;
size_t len;
int flags;
void **dp_res;
};
/*
* MAC operation hooks
*
* @map: Map a resource, return length
* @sync: Sync resource with driver
* @getattr: Get attributes of resource
*/
struct mac_ops {
ssize_t(*map)(struct mac_border *mbp, struct mac_map_args *args);
int(*sync)(struct mac_border *mbp, int flags);
int(*getattr)(struct mac_border *mbp, void *p, size_t len);
};
/*
* A MAC border sits inbetween a resource and the user
* and controls if they can access it or not.
*/
struct mac_border {
mac_level_t level;
struct mac_ops *ops;
};
/*
* Check creds with a specific process and a specific
* resource border.
*
* @procp: Process to check with border
* @mbp: Border to 'procp' is trying to access
*
* Returns zero if the check passed, otherwise a less than
* zero value if the check failed.
*/
int mac_check_creds(struct proc *procp, struct mac_border *mbp);
/*
* Map a resource into process address space by
* going through its border
*
* @mbp: Border of resource
* @off: Offset of mapping to make
* @len: Length of mapping to make
* @res: Result pointer is written here
* @flags: Optional flags
*
* Returns zero on success, otherwise a less than zero value
* on failure.
*/
ssize_t mac_map(struct mac_border *mbp, off_t off, size_t len, void **res, int flags);
/*
* Acquire a specific border using an ID
*
* @id: ID to lookup
*
* Returns the pointer pointer on success, otherwise a NULL
* value on failure.
*/
struct mac_border *mac_get_border(border_id_t id);
#endif /* !_OS_MAC_H_ */
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