26ae2b86b6
variable name conventions for arguments passed into the framework -- for example, name network interfaces 'ifp', sockets 'so', mounts 'mp', mbufs 'm', processes 'p', etc, wherever possible. Previously there was significant variation in this regard. Normalize copyright lists to ranges where sensible.
486 lines
11 KiB
C
486 lines
11 KiB
C
/*-
|
|
* Copyright (c) 1999-2002 Robert N. M. Watson
|
|
* Copyright (c) 2001 Ilmar S. Habibulin
|
|
* Copyright (c) 2001-2004 Networks Associates Technology, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This software was developed by Robert Watson and Ilmar Habibulin for the
|
|
* TrustedBSD Project.
|
|
*
|
|
* 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/mutex.h>
|
|
#include <sys/mac.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/sbuf.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/file.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <net/bpfdesc.h>
|
|
#include <net/if.h>
|
|
#include <net/if_var.h>
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
#include <security/mac/mac_internal.h>
|
|
#include <security/mac/mac_policy.h>
|
|
|
|
/*
|
|
* XXXRW: struct ifnet locking is incomplete in the network code, so we use
|
|
* our own global mutex for struct ifnet. Non-ideal, but should help in the
|
|
* SMP environment.
|
|
*/
|
|
static struct mtx mac_ifnet_mtx;
|
|
MTX_SYSINIT(mac_ifnet_mtx, &mac_ifnet_mtx, "mac_ifnet", MTX_DEF);
|
|
#define MAC_IFNET_LOCK(ifp) mtx_lock(&mac_ifnet_mtx)
|
|
#define MAC_IFNET_UNLOCK(ifp) mtx_unlock(&mac_ifnet_mtx)
|
|
|
|
/*
|
|
* Retrieve the label associated with an mbuf by searching for the tag.
|
|
* Depending on the value of mac_labelmbufs, it's possible that a label will
|
|
* not be present, in which case NULL is returned. Policies must handle the
|
|
* possibility of an mbuf not having label storage if they do not enforce
|
|
* early loading.
|
|
*/
|
|
struct label *
|
|
mac_mbuf_to_label(struct mbuf *m)
|
|
{
|
|
struct m_tag *tag;
|
|
struct label *label;
|
|
|
|
if (m == NULL)
|
|
return (NULL);
|
|
tag = m_tag_find(m, PACKET_TAG_MACLABEL, NULL);
|
|
if (tag == NULL)
|
|
return (NULL);
|
|
label = (struct label *)(tag+1);
|
|
return (label);
|
|
}
|
|
|
|
static struct label *
|
|
mac_bpfdesc_label_alloc(void)
|
|
{
|
|
struct label *label;
|
|
|
|
label = mac_labelzone_alloc(M_WAITOK);
|
|
MAC_PERFORM(init_bpfdesc_label, label);
|
|
return (label);
|
|
}
|
|
|
|
void
|
|
mac_init_bpfdesc(struct bpf_d *d)
|
|
{
|
|
|
|
d->bd_label = mac_bpfdesc_label_alloc();
|
|
}
|
|
|
|
static struct label *
|
|
mac_ifnet_label_alloc(void)
|
|
{
|
|
struct label *label;
|
|
|
|
label = mac_labelzone_alloc(M_WAITOK);
|
|
MAC_PERFORM(init_ifnet_label, label);
|
|
return (label);
|
|
}
|
|
|
|
void
|
|
mac_init_ifnet(struct ifnet *ifp)
|
|
{
|
|
|
|
ifp->if_label = mac_ifnet_label_alloc();
|
|
}
|
|
|
|
int
|
|
mac_init_mbuf_tag(struct m_tag *tag, int flag)
|
|
{
|
|
struct label *label;
|
|
int error;
|
|
|
|
label = (struct label *) (tag + 1);
|
|
mac_init_label(label);
|
|
|
|
MAC_CHECK(init_mbuf_label, label, flag);
|
|
if (error) {
|
|
MAC_PERFORM(destroy_mbuf_label, label);
|
|
mac_destroy_label(label);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_init_mbuf(struct mbuf *m, int flag)
|
|
{
|
|
struct m_tag *tag;
|
|
int error;
|
|
|
|
M_ASSERTPKTHDR(m);
|
|
|
|
#ifndef MAC_ALWAYS_LABEL_MBUF
|
|
/*
|
|
* If conditionally allocating mbuf labels, don't allocate unless
|
|
* they are required.
|
|
*/
|
|
if (!mac_labelmbufs)
|
|
return (0);
|
|
#endif
|
|
tag = m_tag_get(PACKET_TAG_MACLABEL, sizeof(struct label),
|
|
flag);
|
|
if (tag == NULL)
|
|
return (ENOMEM);
|
|
error = mac_init_mbuf_tag(tag, flag);
|
|
if (error) {
|
|
m_tag_free(tag);
|
|
return (error);
|
|
}
|
|
m_tag_prepend(m, tag);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_bpfdesc_label_free(struct label *label)
|
|
{
|
|
|
|
MAC_PERFORM(destroy_bpfdesc_label, label);
|
|
mac_labelzone_free(label);
|
|
}
|
|
|
|
void
|
|
mac_destroy_bpfdesc(struct bpf_d *d)
|
|
{
|
|
|
|
mac_bpfdesc_label_free(d->bd_label);
|
|
d->bd_label = NULL;
|
|
}
|
|
|
|
static void
|
|
mac_ifnet_label_free(struct label *label)
|
|
{
|
|
|
|
MAC_PERFORM(destroy_ifnet_label, label);
|
|
mac_labelzone_free(label);
|
|
}
|
|
|
|
void
|
|
mac_destroy_ifnet(struct ifnet *ifp)
|
|
{
|
|
|
|
mac_ifnet_label_free(ifp->if_label);
|
|
ifp->if_label = NULL;
|
|
}
|
|
|
|
void
|
|
mac_destroy_mbuf_tag(struct m_tag *tag)
|
|
{
|
|
struct label *label;
|
|
|
|
label = (struct label *)(tag+1);
|
|
|
|
MAC_PERFORM(destroy_mbuf_label, label);
|
|
mac_destroy_label(label);
|
|
}
|
|
|
|
/*
|
|
* mac_copy_mbuf_tag is called when an mbuf header is duplicated, in which
|
|
* case the labels must also be duplicated.
|
|
*/
|
|
void
|
|
mac_copy_mbuf_tag(struct m_tag *src, struct m_tag *dest)
|
|
{
|
|
struct label *src_label, *dest_label;
|
|
|
|
src_label = (struct label *)(src+1);
|
|
dest_label = (struct label *)(dest+1);
|
|
|
|
/*
|
|
* mac_init_mbuf_tag() is called on the target tag in m_tag_copy(),
|
|
* so we don't need to call it here.
|
|
*/
|
|
MAC_PERFORM(copy_mbuf_label, src_label, dest_label);
|
|
}
|
|
|
|
void
|
|
mac_copy_mbuf(struct mbuf *m_from, struct mbuf *m_to)
|
|
{
|
|
struct label *src_label, *dest_label;
|
|
|
|
src_label = mac_mbuf_to_label(m_from);
|
|
dest_label = mac_mbuf_to_label(m_to);
|
|
|
|
MAC_PERFORM(copy_mbuf_label, src_label, dest_label);
|
|
}
|
|
|
|
static void
|
|
mac_copy_ifnet_label(struct label *src, struct label *dest)
|
|
{
|
|
|
|
MAC_PERFORM(copy_ifnet_label, src, dest);
|
|
}
|
|
|
|
static int
|
|
mac_externalize_ifnet_label(struct label *label, char *elements,
|
|
char *outbuf, size_t outbuflen)
|
|
{
|
|
int error;
|
|
|
|
MAC_EXTERNALIZE(ifnet, label, elements, outbuf, outbuflen);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mac_internalize_ifnet_label(struct label *label, char *string)
|
|
{
|
|
int error;
|
|
|
|
MAC_INTERNALIZE(ifnet, label, string);
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
mac_create_ifnet(struct ifnet *ifp)
|
|
{
|
|
|
|
MAC_IFNET_LOCK(ifp);
|
|
MAC_PERFORM(create_ifnet, ifp, ifp->if_label);
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
}
|
|
|
|
void
|
|
mac_create_bpfdesc(struct ucred *cred, struct bpf_d *d)
|
|
{
|
|
|
|
MAC_PERFORM(create_bpfdesc, cred, d, d->bd_label);
|
|
}
|
|
|
|
void
|
|
mac_create_mbuf_from_bpfdesc(struct bpf_d *d, struct mbuf *m)
|
|
{
|
|
struct label *label;
|
|
|
|
BPFD_LOCK_ASSERT(d);
|
|
|
|
label = mac_mbuf_to_label(m);
|
|
|
|
MAC_PERFORM(create_mbuf_from_bpfdesc, d, d->bd_label, m, label);
|
|
}
|
|
|
|
void
|
|
mac_create_mbuf_linklayer(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct label *label;
|
|
|
|
label = mac_mbuf_to_label(m);
|
|
|
|
MAC_IFNET_LOCK(ifp);
|
|
MAC_PERFORM(create_mbuf_linklayer, ifp, ifp->if_label, m, label);
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
}
|
|
|
|
void
|
|
mac_create_mbuf_from_ifnet(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct label *label;
|
|
|
|
label = mac_mbuf_to_label(m);
|
|
|
|
MAC_IFNET_LOCK(ifp);
|
|
MAC_PERFORM(create_mbuf_from_ifnet, ifp, ifp->if_label, m, label);
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
}
|
|
|
|
void
|
|
mac_create_mbuf_multicast_encap(struct mbuf *m, struct ifnet *ifp,
|
|
struct mbuf *mnew)
|
|
{
|
|
struct label *mlabel, *mnewlabel;
|
|
|
|
mlabel = mac_mbuf_to_label(m);
|
|
mnewlabel = mac_mbuf_to_label(mnew);
|
|
|
|
MAC_IFNET_LOCK(ifp);
|
|
MAC_PERFORM(create_mbuf_multicast_encap, m, mlabel, ifp,
|
|
ifp->if_label, mnew, mnewlabel);
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
}
|
|
|
|
void
|
|
mac_create_mbuf_netlayer(struct mbuf *m, struct mbuf *mnew)
|
|
{
|
|
struct label *mlabel, *mnewlabel;
|
|
|
|
mlabel = mac_mbuf_to_label(m);
|
|
mnewlabel = mac_mbuf_to_label(mnew);
|
|
|
|
MAC_PERFORM(create_mbuf_netlayer, m, mlabel, mnew, mnewlabel);
|
|
}
|
|
|
|
int
|
|
mac_check_bpfdesc_receive(struct bpf_d *d, struct ifnet *ifp)
|
|
{
|
|
int error;
|
|
|
|
BPFD_LOCK_ASSERT(d);
|
|
|
|
MAC_IFNET_LOCK(ifp);
|
|
MAC_CHECK(check_bpfdesc_receive, d, d->bd_label, ifp, ifp->if_label);
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_check_ifnet_transmit(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct label *label;
|
|
int error;
|
|
|
|
M_ASSERTPKTHDR(m);
|
|
|
|
label = mac_mbuf_to_label(m);
|
|
|
|
MAC_IFNET_LOCK(ifp);
|
|
MAC_CHECK(check_ifnet_transmit, ifp, ifp->if_label, m, label);
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
|
|
struct ifnet *ifp)
|
|
{
|
|
char *elements, *buffer;
|
|
struct label *intlabel;
|
|
struct mac mac;
|
|
int error;
|
|
|
|
error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac));
|
|
if (error)
|
|
return (error);
|
|
|
|
error = mac_check_structmac_consistent(&mac);
|
|
if (error)
|
|
return (error);
|
|
|
|
elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
|
|
error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
|
|
if (error) {
|
|
free(elements, M_MACTEMP);
|
|
return (error);
|
|
}
|
|
|
|
buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
|
|
intlabel = mac_ifnet_label_alloc();
|
|
MAC_IFNET_LOCK(ifp);
|
|
mac_copy_ifnet_label(ifp->if_label, intlabel);
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
error = mac_externalize_ifnet_label(intlabel, elements, buffer,
|
|
mac.m_buflen);
|
|
mac_ifnet_label_free(intlabel);
|
|
if (error == 0)
|
|
error = copyout(buffer, mac.m_string, strlen(buffer)+1);
|
|
|
|
free(buffer, M_MACTEMP);
|
|
free(elements, M_MACTEMP);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr, struct ifnet *ifp)
|
|
{
|
|
struct label *intlabel;
|
|
struct mac mac;
|
|
char *buffer;
|
|
int error;
|
|
|
|
error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac));
|
|
if (error)
|
|
return (error);
|
|
|
|
error = mac_check_structmac_consistent(&mac);
|
|
if (error)
|
|
return (error);
|
|
|
|
buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
|
|
error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL);
|
|
if (error) {
|
|
free(buffer, M_MACTEMP);
|
|
return (error);
|
|
}
|
|
|
|
intlabel = mac_ifnet_label_alloc();
|
|
error = mac_internalize_ifnet_label(intlabel, buffer);
|
|
free(buffer, M_MACTEMP);
|
|
if (error) {
|
|
mac_ifnet_label_free(intlabel);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* XXX: Note that this is a redundant privilege check, since policies
|
|
* impose this check themselves if required by the policy
|
|
* Eventually, this should go away.
|
|
*/
|
|
error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 0);
|
|
if (error) {
|
|
mac_ifnet_label_free(intlabel);
|
|
return (error);
|
|
}
|
|
|
|
MAC_IFNET_LOCK(ifp);
|
|
MAC_CHECK(check_ifnet_relabel, cred, ifp, ifp->if_label, intlabel);
|
|
if (error) {
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
mac_ifnet_label_free(intlabel);
|
|
return (error);
|
|
}
|
|
|
|
MAC_PERFORM(relabel_ifnet, cred, ifp, ifp->if_label, intlabel);
|
|
MAC_IFNET_UNLOCK(ifp);
|
|
|
|
mac_ifnet_label_free(intlabel);
|
|
return (0);
|
|
}
|