freebsd-dev/sys/security/mac/mac_pipe.c
Robert Watson 738f14d4b1 Remove MAC_DEBUG label counters, which were used to debug leaks and
other problems while labels were first being added to various kernel
objects.  They have outlived their usefulness.

MFC after:	1 month
Suggested by:	Christopher dot Vance at SPARTA dot com
Obtained from:	TrustedBSD Project
2006-09-20 13:33:41 +00:00

243 lines
5.1 KiB
C

/*-
* Copyright (c) 2002, 2003 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project in part by Network
* Associates Laboratories, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
* as part of the DARPA CHATS research program.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/mac.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/pipe.h>
#include <sys/sysctl.h>
#include <sys/mac_policy.h>
#include <security/mac/mac_internal.h>
static int mac_enforce_pipe = 1;
SYSCTL_INT(_security_mac, OID_AUTO, enforce_pipe, CTLFLAG_RW,
&mac_enforce_pipe, 0, "Enforce MAC policy on pipe operations");
TUNABLE_INT("security.mac.enforce_pipe", &mac_enforce_pipe);
struct label *
mac_pipe_label_alloc(void)
{
struct label *label;
label = mac_labelzone_alloc(M_WAITOK);
MAC_PERFORM(init_pipe_label, label);
return (label);
}
void
mac_init_pipe(struct pipepair *pp)
{
pp->pp_label = mac_pipe_label_alloc();
}
void
mac_pipe_label_free(struct label *label)
{
MAC_PERFORM(destroy_pipe_label, label);
mac_labelzone_free(label);
}
void
mac_destroy_pipe(struct pipepair *pp)
{
mac_pipe_label_free(pp->pp_label);
pp->pp_label = NULL;
}
void
mac_copy_pipe_label(struct label *src, struct label *dest)
{
MAC_PERFORM(copy_pipe_label, src, dest);
}
int
mac_externalize_pipe_label(struct label *label, char *elements,
char *outbuf, size_t outbuflen)
{
int error;
MAC_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen);
return (error);
}
int
mac_internalize_pipe_label(struct label *label, char *string)
{
int error;
MAC_INTERNALIZE(pipe, label, string);
return (error);
}
void
mac_create_pipe(struct ucred *cred, struct pipepair *pp)
{
MAC_PERFORM(create_pipe, cred, pp, pp->pp_label);
}
static void
mac_relabel_pipe(struct ucred *cred, struct pipepair *pp,
struct label *newlabel)
{
MAC_PERFORM(relabel_pipe, cred, pp, pp->pp_label, newlabel);
}
int
mac_check_pipe_ioctl(struct ucred *cred, struct pipepair *pp,
unsigned long cmd, void *data)
{
int error;
mtx_assert(&pp->pp_mtx, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_ioctl, cred, pp, pp->pp_label, cmd, data);
return (error);
}
int
mac_check_pipe_poll(struct ucred *cred, struct pipepair *pp)
{
int error;
mtx_assert(&pp->pp_mtx, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_poll, cred, pp, pp->pp_label);
return (error);
}
int
mac_check_pipe_read(struct ucred *cred, struct pipepair *pp)
{
int error;
mtx_assert(&pp->pp_mtx, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_read, cred, pp, pp->pp_label);
return (error);
}
static int
mac_check_pipe_relabel(struct ucred *cred, struct pipepair *pp,
struct label *newlabel)
{
int error;
mtx_assert(&pp->pp_mtx, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_relabel, cred, pp, pp->pp_label, newlabel);
return (error);
}
int
mac_check_pipe_stat(struct ucred *cred, struct pipepair *pp)
{
int error;
mtx_assert(&pp->pp_mtx, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_stat, cred, pp, pp->pp_label);
return (error);
}
int
mac_check_pipe_write(struct ucred *cred, struct pipepair *pp)
{
int error;
mtx_assert(&pp->pp_mtx, MA_OWNED);
if (!mac_enforce_pipe)
return (0);
MAC_CHECK(check_pipe_write, cred, pp, pp->pp_label);
return (error);
}
int
mac_pipe_label_set(struct ucred *cred, struct pipepair *pp,
struct label *label)
{
int error;
mtx_assert(&pp->pp_mtx, MA_OWNED);
error = mac_check_pipe_relabel(cred, pp, label);
if (error)
return (error);
mac_relabel_pipe(cred, pp, label);
return (0);
}