7bb862d793
support functions:
cap_subset_np() - Is cap1 a subset of cap2
cap_equal_np() - Is cap1 equal to cap2
o Introduce implementations of POSIX.1e capability support functions:
cap_copy_ext() - Externalize capability
cap_copy_int() - Internalize capability
cap_size() - Determine size required for cap_copy_ext()
Submitted by: tmm
Obtained from: TrustedBSD Project
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
|
|
* Copyright 2001 by Thomas Moestl. 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 REGENTS 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* TrustedBSD implementation of cap_copy_ext()/cap_copy_int()
|
|
*
|
|
* These are largely nops currently, because our internal format is contiguous.
|
|
* We just copy our representation out, and do some minumum validations on
|
|
* external data.
|
|
*
|
|
* XXX: we cannot detect cap being invalid. If it is, the program will probably
|
|
* segfault.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/capability.h>
|
|
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
|
|
int
|
|
cap_copy_ext(void *ext_p, cap_t cap, ssize_t size)
|
|
{
|
|
if (size < 0) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
if (size < sizeof(struct cap)) {
|
|
errno = ERANGE;
|
|
return (-1);
|
|
}
|
|
memcpy(ext_p, cap, sizeof(struct cap));
|
|
return (sizeof(struct cap));
|
|
}
|
|
|
|
cap_t
|
|
cap_copy_int(const void *ext_p)
|
|
{
|
|
cap_t c;
|
|
/* We can use cap_dup here, because the format is the same */
|
|
if ((c = cap_dup((cap_t)ext_p)) == NULL)
|
|
return ((cap_t)NULL);
|
|
/* Basic validation */
|
|
if ((c->c_effective & ~CAP_ALL_ON) || (c->c_permitted & ~CAP_ALL_ON) ||
|
|
(c->c_inheritable & ~CAP_ALL_ON)) {
|
|
cap_free(c);
|
|
errno = EINVAL;
|
|
return ((cap_t)NULL);
|
|
}
|
|
return (c);
|
|
}
|
|
|
|
int
|
|
cap_size(cap_t cap)
|
|
{
|
|
(void)cap; /* silence warning */
|
|
return (sizeof(struct cap));
|
|
}
|