0142affc77
LABEL_TO_SLOT() macro used by policy modules to query and set label data in struct label. Instead of using a union, store an intptr_t, simplifying the API. Update policies: in most cases this required only small tweaks to current wrapper macros. In two cases, a single wrapper macros had to be split into separate get and set macros. Move struct label definition from _label.h to mac_internal.h and remove _label.h. With this change, policies may now treat struct label * as opaque, allowing us to change the layout of struct label without breaking the policy module ABI. For example, we could make the maximum number of policies with labels modifiable at boot-time rather than just at compile-time. Obtained from: TrustedBSD Project
152 lines
4.0 KiB
C
152 lines
4.0 KiB
C
/*-
|
|
* Copyright (c) 2003-2004 Networks Associates Technology, Inc.
|
|
* Copyright (c) 2007 Robert N. M. Watson
|
|
* 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/module.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <vm/uma.h>
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
#include <security/mac/mac_internal.h>
|
|
#include <security/mac/mac_policy.h>
|
|
|
|
/*
|
|
* zone_label is the UMA zone from which most labels are allocated. Label
|
|
* structures are initialized to zero bytes so that policies see a NULL/0
|
|
* slot on first use, even if the policy is loaded after the label is
|
|
* allocated for an object.
|
|
*/
|
|
static uma_zone_t zone_label;
|
|
|
|
static int mac_labelzone_ctor(void *mem, int size, void *arg, int flags);
|
|
static void mac_labelzone_dtor(void *mem, int size, void *arg);
|
|
|
|
void
|
|
mac_labelzone_init(void)
|
|
{
|
|
|
|
zone_label = uma_zcreate("MAC labels", sizeof(struct label),
|
|
mac_labelzone_ctor, mac_labelzone_dtor, NULL, NULL,
|
|
UMA_ALIGN_PTR, 0);
|
|
}
|
|
|
|
/*
|
|
* mac_init_label() and mac_destroy_label() are exported so that they can be
|
|
* used in mbuf tag initialization, where labels are not slab allocated from
|
|
* the zone_label zone.
|
|
*/
|
|
void
|
|
mac_init_label(struct label *label)
|
|
{
|
|
|
|
bzero(label, sizeof(*label));
|
|
label->l_flags = MAC_FLAG_INITIALIZED;
|
|
}
|
|
|
|
void
|
|
mac_destroy_label(struct label *label)
|
|
{
|
|
|
|
KASSERT(label->l_flags & MAC_FLAG_INITIALIZED,
|
|
("destroying uninitialized label"));
|
|
|
|
#ifdef DIAGNOSTIC
|
|
bzero(label, sizeof(*label));
|
|
#else
|
|
label->l_flags &= ~MAC_FLAG_INITIALIZED;
|
|
#endif
|
|
}
|
|
|
|
|
|
static int
|
|
mac_labelzone_ctor(void *mem, int size, void *arg, int flags)
|
|
{
|
|
struct label *label;
|
|
|
|
KASSERT(size == sizeof(*label), ("mac_labelzone_ctor: wrong size\n"));
|
|
label = mem;
|
|
mac_init_label(label);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_labelzone_dtor(void *mem, int size, void *arg)
|
|
{
|
|
struct label *label;
|
|
|
|
KASSERT(size == sizeof(*label), ("mac_labelzone_dtor: wrong size\n"));
|
|
label = mem;
|
|
mac_destroy_label(label);
|
|
}
|
|
|
|
struct label *
|
|
mac_labelzone_alloc(int flags)
|
|
{
|
|
|
|
return (uma_zalloc(zone_label, flags));
|
|
}
|
|
|
|
void
|
|
mac_labelzone_free(struct label *label)
|
|
{
|
|
|
|
uma_zfree(zone_label, label);
|
|
}
|
|
|
|
/*
|
|
* Functions used by policy modules to get and set label values.
|
|
*/
|
|
intptr_t
|
|
mac_label_get(struct label *l, int slot)
|
|
{
|
|
|
|
KASSERT(l != NULL, ("mac_label_get: NULL label"));
|
|
|
|
return (l->l_perpolicy[slot]);
|
|
}
|
|
|
|
void
|
|
mac_label_set(struct label *l, int slot, intptr_t v)
|
|
{
|
|
|
|
KASSERT(l != NULL, ("mac_label_set: NULL label"));
|
|
|
|
l->l_perpolicy[slot] = v;
|
|
}
|