7beaaf5cd2
begun with a repo-copy of mac.h to mac_framework.h. sys/mac.h now contains the userspace and user<->kernel API and definitions, with all in-kernel interfaces moved to mac_framework.h, which is now included across most of the kernel instead. This change is the first step in a larger cleanup and sweep of MAC Framework interfaces in the kernel, and will not be MFC'd. Obtained from: TrustedBSD Project Sponsored by: SPARTA
498 lines
11 KiB
C
498 lines
11 KiB
C
/*-
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* Copyright (c) 1999-2002 Robert N. M. Watson
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* Copyright (c) 2001 Ilmar S. Habibulin
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* Copyright (c) 2001-2004 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert Watson and Ilmar Habibulin for the
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* TrustedBSD Project.
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/mac.h>
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#include <sys/sbuf.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/file.h>
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#include <sys/namei.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/mac_policy.h>
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#include <net/bpfdesc.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <security/mac/mac_framework.h>
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#include <security/mac/mac_internal.h>
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/*
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* mac_enforce_network is used by IPv4 and IPv6 checks, and so must
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* be non-static for now.
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*/
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int mac_enforce_network = 1;
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SYSCTL_INT(_security_mac, OID_AUTO, enforce_network, CTLFLAG_RW,
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&mac_enforce_network, 0, "Enforce MAC policy on network packets");
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TUNABLE_INT("security.mac.enforce_network", &mac_enforce_network);
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/*
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* XXXRW: struct ifnet locking is incomplete in the network code, so we
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* use our own global mutex for struct ifnet. Non-ideal, but should help
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* in the SMP environment.
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*/
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static struct mtx mac_ifnet_mtx;
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MTX_SYSINIT(mac_ifnet_mtx, &mac_ifnet_mtx, "mac_ifnet", MTX_DEF);
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#define MAC_IFNET_LOCK(ifp) mtx_lock(&mac_ifnet_mtx)
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#define MAC_IFNET_UNLOCK(ifp) mtx_unlock(&mac_ifnet_mtx)
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struct label *
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mac_mbuf_to_label(struct mbuf *mbuf)
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{
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struct m_tag *tag;
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struct label *label;
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if (mbuf == NULL)
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return (NULL);
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tag = m_tag_find(mbuf, PACKET_TAG_MACLABEL, NULL);
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if (tag == NULL)
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return (NULL);
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label = (struct label *)(tag+1);
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return (label);
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}
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static struct label *
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mac_bpfdesc_label_alloc(void)
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{
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struct label *label;
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label = mac_labelzone_alloc(M_WAITOK);
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MAC_PERFORM(init_bpfdesc_label, label);
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return (label);
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}
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void
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mac_init_bpfdesc(struct bpf_d *bpf_d)
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{
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bpf_d->bd_label = mac_bpfdesc_label_alloc();
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}
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static struct label *
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mac_ifnet_label_alloc(void)
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{
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struct label *label;
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label = mac_labelzone_alloc(M_WAITOK);
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MAC_PERFORM(init_ifnet_label, label);
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return (label);
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}
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void
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mac_init_ifnet(struct ifnet *ifp)
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{
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ifp->if_label = mac_ifnet_label_alloc();
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}
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int
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mac_init_mbuf_tag(struct m_tag *tag, int flag)
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{
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struct label *label;
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int error;
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label = (struct label *) (tag + 1);
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mac_init_label(label);
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MAC_CHECK(init_mbuf_label, label, flag);
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if (error) {
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MAC_PERFORM(destroy_mbuf_label, label);
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mac_destroy_label(label);
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}
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return (error);
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}
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int
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mac_init_mbuf(struct mbuf *m, int flag)
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{
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struct m_tag *tag;
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int error;
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M_ASSERTPKTHDR(m);
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#ifndef MAC_ALWAYS_LABEL_MBUF
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/*
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* If conditionally allocating mbuf labels, don't allocate unless
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* they are required.
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*/
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if (!mac_labelmbufs)
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return (0);
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#endif
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tag = m_tag_get(PACKET_TAG_MACLABEL, sizeof(struct label),
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flag);
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if (tag == NULL)
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return (ENOMEM);
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error = mac_init_mbuf_tag(tag, flag);
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if (error) {
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m_tag_free(tag);
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return (error);
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}
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m_tag_prepend(m, tag);
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return (0);
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}
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static void
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mac_bpfdesc_label_free(struct label *label)
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{
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MAC_PERFORM(destroy_bpfdesc_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_destroy_bpfdesc(struct bpf_d *bpf_d)
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{
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mac_bpfdesc_label_free(bpf_d->bd_label);
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bpf_d->bd_label = NULL;
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}
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static void
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mac_ifnet_label_free(struct label *label)
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{
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MAC_PERFORM(destroy_ifnet_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_destroy_ifnet(struct ifnet *ifp)
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{
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mac_ifnet_label_free(ifp->if_label);
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ifp->if_label = NULL;
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}
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void
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mac_destroy_mbuf_tag(struct m_tag *tag)
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{
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struct label *label;
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label = (struct label *)(tag+1);
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MAC_PERFORM(destroy_mbuf_label, label);
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mac_destroy_label(label);
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}
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void
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mac_copy_mbuf_tag(struct m_tag *src, struct m_tag *dest)
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{
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struct label *src_label, *dest_label;
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src_label = (struct label *)(src+1);
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dest_label = (struct label *)(dest+1);
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/*
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* mac_init_mbuf_tag() is called on the target tag in
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* m_tag_copy(), so we don't need to call it here.
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*/
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MAC_PERFORM(copy_mbuf_label, src_label, dest_label);
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}
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void
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mac_copy_mbuf(struct mbuf *m_from, struct mbuf *m_to)
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{
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struct label *src_label, *dest_label;
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src_label = mac_mbuf_to_label(m_from);
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dest_label = mac_mbuf_to_label(m_to);
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MAC_PERFORM(copy_mbuf_label, src_label, dest_label);
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}
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static void
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mac_copy_ifnet_label(struct label *src, struct label *dest)
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{
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MAC_PERFORM(copy_ifnet_label, src, dest);
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}
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static int
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mac_externalize_ifnet_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen)
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{
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int error;
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MAC_EXTERNALIZE(ifnet, label, elements, outbuf, outbuflen);
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return (error);
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}
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static int
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mac_internalize_ifnet_label(struct label *label, char *string)
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{
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int error;
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MAC_INTERNALIZE(ifnet, label, string);
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return (error);
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}
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void
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mac_create_ifnet(struct ifnet *ifnet)
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{
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MAC_IFNET_LOCK(ifnet);
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MAC_PERFORM(create_ifnet, ifnet, ifnet->if_label);
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MAC_IFNET_UNLOCK(ifnet);
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}
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void
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mac_create_bpfdesc(struct ucred *cred, struct bpf_d *bpf_d)
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{
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MAC_PERFORM(create_bpfdesc, cred, bpf_d, bpf_d->bd_label);
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}
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void
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mac_create_mbuf_from_bpfdesc(struct bpf_d *bpf_d, struct mbuf *mbuf)
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{
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struct label *label;
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BPFD_LOCK_ASSERT(bpf_d);
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label = mac_mbuf_to_label(mbuf);
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MAC_PERFORM(create_mbuf_from_bpfdesc, bpf_d, bpf_d->bd_label, mbuf,
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label);
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}
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void
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mac_create_mbuf_linklayer(struct ifnet *ifnet, struct mbuf *mbuf)
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{
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struct label *label;
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label = mac_mbuf_to_label(mbuf);
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MAC_IFNET_LOCK(ifnet);
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MAC_PERFORM(create_mbuf_linklayer, ifnet, ifnet->if_label, mbuf,
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label);
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MAC_IFNET_UNLOCK(ifnet);
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}
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void
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mac_create_mbuf_from_ifnet(struct ifnet *ifnet, struct mbuf *mbuf)
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{
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struct label *label;
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label = mac_mbuf_to_label(mbuf);
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MAC_IFNET_LOCK(ifnet);
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MAC_PERFORM(create_mbuf_from_ifnet, ifnet, ifnet->if_label, mbuf,
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label);
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MAC_IFNET_UNLOCK(ifnet);
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}
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void
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mac_create_mbuf_multicast_encap(struct mbuf *oldmbuf, struct ifnet *ifnet,
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struct mbuf *newmbuf)
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{
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struct label *oldmbuflabel, *newmbuflabel;
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oldmbuflabel = mac_mbuf_to_label(oldmbuf);
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newmbuflabel = mac_mbuf_to_label(newmbuf);
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MAC_IFNET_LOCK(ifnet);
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MAC_PERFORM(create_mbuf_multicast_encap, oldmbuf, oldmbuflabel,
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ifnet, ifnet->if_label, newmbuf, newmbuflabel);
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MAC_IFNET_UNLOCK(ifnet);
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}
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void
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mac_create_mbuf_netlayer(struct mbuf *oldmbuf, struct mbuf *newmbuf)
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{
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struct label *oldmbuflabel, *newmbuflabel;
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oldmbuflabel = mac_mbuf_to_label(oldmbuf);
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newmbuflabel = mac_mbuf_to_label(newmbuf);
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MAC_PERFORM(create_mbuf_netlayer, oldmbuf, oldmbuflabel, newmbuf,
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newmbuflabel);
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}
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int
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mac_check_bpfdesc_receive(struct bpf_d *bpf_d, struct ifnet *ifnet)
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{
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int error;
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BPFD_LOCK_ASSERT(bpf_d);
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if (!mac_enforce_network)
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return (0);
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MAC_IFNET_LOCK(ifnet);
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MAC_CHECK(check_bpfdesc_receive, bpf_d, bpf_d->bd_label, ifnet,
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ifnet->if_label);
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MAC_IFNET_UNLOCK(ifnet);
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return (error);
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}
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int
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mac_check_ifnet_transmit(struct ifnet *ifnet, struct mbuf *mbuf)
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{
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struct label *label;
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int error;
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M_ASSERTPKTHDR(mbuf);
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if (!mac_enforce_network)
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return (0);
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label = mac_mbuf_to_label(mbuf);
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MAC_IFNET_LOCK(ifnet);
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MAC_CHECK(check_ifnet_transmit, ifnet, ifnet->if_label, mbuf,
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label);
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MAC_IFNET_UNLOCK(ifnet);
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return (error);
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}
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int
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mac_ioctl_ifnet_get(struct ucred *cred, struct ifreq *ifr,
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struct ifnet *ifnet)
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{
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char *elements, *buffer;
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struct label *intlabel;
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struct mac mac;
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int error;
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error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac));
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if (error)
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return (error);
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error = mac_check_structmac_consistent(&mac);
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if (error)
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return (error);
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elements = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, elements, mac.m_buflen, NULL);
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if (error) {
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free(elements, M_MACTEMP);
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return (error);
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}
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK | M_ZERO);
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intlabel = mac_ifnet_label_alloc();
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MAC_IFNET_LOCK(ifnet);
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mac_copy_ifnet_label(ifnet->if_label, intlabel);
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MAC_IFNET_UNLOCK(ifnet);
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error = mac_externalize_ifnet_label(ifnet->if_label, elements,
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buffer, mac.m_buflen);
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mac_ifnet_label_free(intlabel);
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if (error == 0)
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error = copyout(buffer, mac.m_string, strlen(buffer)+1);
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free(buffer, M_MACTEMP);
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free(elements, M_MACTEMP);
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return (error);
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}
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int
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mac_ioctl_ifnet_set(struct ucred *cred, struct ifreq *ifr,
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struct ifnet *ifnet)
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{
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struct label *intlabel;
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struct mac mac;
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char *buffer;
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int error;
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error = copyin(ifr->ifr_ifru.ifru_data, &mac, sizeof(mac));
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if (error)
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return (error);
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error = mac_check_structmac_consistent(&mac);
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if (error)
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return (error);
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buffer = malloc(mac.m_buflen, M_MACTEMP, M_WAITOK);
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error = copyinstr(mac.m_string, buffer, mac.m_buflen, NULL);
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if (error) {
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free(buffer, M_MACTEMP);
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return (error);
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}
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intlabel = mac_ifnet_label_alloc();
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error = mac_internalize_ifnet_label(intlabel, buffer);
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free(buffer, M_MACTEMP);
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if (error) {
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mac_ifnet_label_free(intlabel);
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return (error);
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}
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/*
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* XXX: Note that this is a redundant privilege check, since
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* policies impose this check themselves if required by the
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* policy. Eventually, this should go away.
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*/
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error = suser_cred(cred, 0);
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if (error) {
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mac_ifnet_label_free(intlabel);
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return (error);
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}
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MAC_IFNET_LOCK(ifnet);
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MAC_CHECK(check_ifnet_relabel, cred, ifnet, ifnet->if_label,
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intlabel);
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if (error) {
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MAC_IFNET_UNLOCK(ifnet);
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mac_ifnet_label_free(intlabel);
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return (error);
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}
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MAC_PERFORM(relabel_ifnet, cred, ifnet, ifnet->if_label, intlabel);
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MAC_IFNET_UNLOCK(ifnet);
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mac_ifnet_label_free(intlabel);
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return (0);
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}
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