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/*-
* Copyright (c) 2008-2010 Robert N. M. Watson
* All rights reserved.
*
* This software was developed at the University of Cambridge Computer
* Laboratory with support from a grant from Google, Inc.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
/*
* Definitions for FreeBSD capabilities facility.
*/
#ifndef _SYS_CAPABILITY_H_
#define _SYS_CAPABILITY_H_
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/file.h>
/*
* Possible rights on capabilities.
*
* Notes:
* Some system calls don't require a capability in order to perform an
* operation on an fd. These include: close, dup, dup2.
*
* sendfile is authorized using CAP_READ on the file and CAP_WRITE on the
* socket.
*
* mmap() and aio*() system calls will need special attention as they may
* involve reads or writes depending a great deal on context.
*/
/* General file I/O. */
#define CAP_READ 0x0000000000000001ULL /* read/recv */
#define CAP_WRITE 0x0000000000000002ULL /* write/send */
#define CAP_MMAP 0x0000000000000004ULL /* mmap */
#define CAP_MAPEXEC 0x0000000000000008ULL /* mmap(2) as exec */
#define CAP_FEXECVE 0x0000000000000010ULL
#define CAP_FSYNC 0x0000000000000020ULL
#define CAP_FTRUNCATE 0x0000000000000040ULL
#define CAP_SEEK 0x0000000000000080ULL
/* VFS methods. */
#define CAP_FCHFLAGS 0x0000000000000100ULL
#define CAP_FCHDIR 0x0000000000000200ULL
#define CAP_FCHMOD 0x0000000000000400ULL
#define CAP_FCHOWN 0x0000000000000800ULL
#define CAP_FCNTL 0x0000000000001000ULL
#define CAP_FPATHCONF 0x0000000000002000ULL
#define CAP_FLOCK 0x0000000000004000ULL
#define CAP_FSCK 0x0000000000008000ULL
#define CAP_FSTAT 0x0000000000010000ULL
#define CAP_FSTATFS 0x0000000000020000ULL
#define CAP_FUTIMES 0x0000000000040000ULL
#define CAP_CREATE 0x0000000000080000ULL
#define CAP_DELETE 0x0000000000100000ULL
#define CAP_MKDIR 0x0000000000200000ULL
#define CAP_RMDIR 0x0000000000400000ULL
#define CAP_MKFIFO 0x0000000000800000ULL
/* Lookups - used to constrain *at() calls. */
#define CAP_LOOKUP 0x0000000001000000ULL
/* Extended attributes. */
#define CAP_EXTATTR_DELETE 0x0000000002000000ULL
#define CAP_EXTATTR_GET 0x0000000004000000ULL
#define CAP_EXTATTR_LIST 0x0000000008000000ULL
#define CAP_EXTATTR_SET 0x0000000010000000ULL
/* Access Control Lists. */
#define CAP_ACL_CHECK 0x0000000020000000ULL
#define CAP_ACL_DELETE 0x0000000040000000ULL
#define CAP_ACL_GET 0x0000000080000000ULL
#define CAP_ACL_SET 0x0000000100000000ULL
/* Socket operations. */
#define CAP_ACCEPT 0x0000000200000000ULL
#define CAP_BIND 0x0000000400000000ULL
#define CAP_CONNECT 0x0000000800000000ULL
#define CAP_GETPEERNAME 0x0000001000000000ULL
#define CAP_GETSOCKNAME 0x0000002000000000ULL
#define CAP_GETSOCKOPT 0x0000004000000000ULL
#define CAP_LISTEN 0x0000008000000000ULL
#define CAP_PEELOFF 0x0000010000000000ULL
#define CAP_SETSOCKOPT 0x0000020000000000ULL
#define CAP_SHUTDOWN 0x0000040000000000ULL
#define CAP_SOCK_ALL \
(CAP_ACCEPT | CAP_BIND | CAP_CONNECT \
| CAP_GETPEERNAME | CAP_GETSOCKNAME | CAP_GETSOCKOPT \
| CAP_LISTEN | CAP_PEELOFF | CAP_SETSOCKOPT | CAP_SHUTDOWN)
/* Mandatory Access Control. */
#define CAP_MAC_GET 0x0000080000000000ULL
#define CAP_MAC_SET 0x0000100000000000ULL
/* Methods on semaphores. */
#define CAP_SEM_GETVALUE 0x0000200000000000ULL
#define CAP_SEM_POST 0x0000400000000000ULL
#define CAP_SEM_WAIT 0x0000800000000000ULL
/* kqueue events. */
#define CAP_POLL_EVENT 0x0001000000000000ULL
#define CAP_POST_EVENT 0x0002000000000000ULL
/* Strange and powerful rights that should not be given lightly. */
#define CAP_IOCTL 0x0004000000000000ULL
#define CAP_TTYHOOK 0x0008000000000000ULL
/* Process management via process descriptors. */
#define CAP_PDGETPID 0x0010000000000000ULL
#define CAP_PDWAIT 0x0020000000000000ULL
#define CAP_PDKILL 0x0040000000000000ULL
/* The mask of all valid method rights. */
#define CAP_MASK_VALID 0x007fffffffffffffULL
#ifdef _KERNEL
#define IN_CAPABILITY_MODE(td) (td->td_ucred->cr_flags & CRED_FLAG_CAPMODE)
/*
* Create a capability to wrap a file object.
*/
int kern_capwrap(struct thread *td, struct file *fp, cap_rights_t rights,
int *capfd);
/*
* Unwrap a capability if its rights mask is a superset of 'rights'.
*
* Unwrapping a non-capability is effectively a no-op; the value of fp_cap
* is simply copied into fpp.
*/
int cap_funwrap(struct file *fp_cap, cap_rights_t rights,
struct file **fpp);
int cap_funwrap_mmap(struct file *fp_cap, cap_rights_t rights,
u_char *maxprotp, struct file **fpp);
/*
* For the purposes of procstat(1) and similar tools, allow kern_descrip.c to
* extract the rights from a capability. However, this should not be used by
* kernel code generally, instead cap_funwrap() should be used in order to
* keep all access control in one place.
*/
cap_rights_t cap_rights(struct file *fp_cap);
#else /* !_KERNEL */
__BEGIN_DECLS
/*
* cap_enter(): Cause the process to enter capability mode, which will
* prevent it from directly accessing global namespaces. System calls will
* be limited to process-local, process-inherited, or file descriptor
* operations. If already in capability mode, a no-op.
*
* Currently, process-inherited operations are not properly handled -- in
* particular, we're interested in things like waitpid(2), kill(2), etc,
* being properly constrained. One possible solution is to introduce process
* descriptors.
*/
int cap_enter(void);
/*
* cap_getmode(): Are we in capability mode?
*/
int cap_getmode(u_int* modep);
/*
* cap_new(): Create a new capability derived from an existing file
* descriptor with the specified rights. If the existing file descriptor is
* a capability, then the new rights must be a subset of the existing rights.
*/
int cap_new(int fd, cap_rights_t rights);
/*
* cap_getrights(): Query the rights on a capability.
*/
int cap_getrights(int fd, cap_rights_t *rightsp);
__END_DECLS
#endif /* !_KERNEL */
#endif /* !_SYS_CAPABILITY_H_ */
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