d94f2a68f8
exists to allow the mandatory access control policy to properly initialize
mbufs generated by the firewall. An example where this might happen is keep
alive packets, or ICMP error packets in response to other packets.
This takes care of kernel panics associated with un-initialize mbuf labels
when the firewall generates packets.
[1] I modified this patch from it's original version, the initial patch
introduced a number of entry points which were programmatically
equivalent. So I introduced only one. Instead, we should leverage
mac_create_mbuf_netlayer() which is used for similar situations,
an example being icmp_error()
This will minimize the impact associated with the MFC
Submitted by: mlaier [1]
MFC after: 1 week
This is a RELENG_6 candidate
303 lines
6.7 KiB
C
303 lines
6.7 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/if.h>
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#include <net/if_var.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <security/mac/mac_internal.h>
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#ifdef MAC_DEBUG
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static unsigned int nmacinpcbs, nmacipqs;
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SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, inpcbs, CTLFLAG_RD,
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&nmacinpcbs, 0, "number of inpcbs in use");
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SYSCTL_UINT(_security_mac_debug_counters, OID_AUTO, ipqs, CTLFLAG_RD,
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&nmacipqs, 0, "number of ipqs in use");
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#endif
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static struct label *
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mac_inpcb_label_alloc(int flag)
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{
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struct label *label;
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int error;
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label = mac_labelzone_alloc(flag);
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if (label == NULL)
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return (NULL);
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MAC_CHECK(init_inpcb_label, label, flag);
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if (error) {
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MAC_PERFORM(destroy_inpcb_label, label);
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mac_labelzone_free(label);
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return (NULL);
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}
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MAC_DEBUG_COUNTER_INC(&nmacinpcbs);
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return (label);
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}
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int
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mac_init_inpcb(struct inpcb *inp, int flag)
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{
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inp->inp_label = mac_inpcb_label_alloc(flag);
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if (inp->inp_label == NULL)
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return (ENOMEM);
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return (0);
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}
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static struct label *
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mac_ipq_label_alloc(int flag)
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{
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struct label *label;
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int error;
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label = mac_labelzone_alloc(flag);
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if (label == NULL)
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return (NULL);
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MAC_CHECK(init_ipq_label, label, flag);
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if (error) {
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MAC_PERFORM(destroy_ipq_label, label);
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mac_labelzone_free(label);
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return (NULL);
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}
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MAC_DEBUG_COUNTER_INC(&nmacipqs);
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return (label);
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}
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int
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mac_init_ipq(struct ipq *ipq, int flag)
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{
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ipq->ipq_label = mac_ipq_label_alloc(flag);
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if (ipq->ipq_label == NULL)
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return (ENOMEM);
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return (0);
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}
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static void
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mac_inpcb_label_free(struct label *label)
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{
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MAC_PERFORM(destroy_inpcb_label, label);
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mac_labelzone_free(label);
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MAC_DEBUG_COUNTER_DEC(&nmacinpcbs);
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}
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void
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mac_destroy_inpcb(struct inpcb *inp)
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{
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mac_inpcb_label_free(inp->inp_label);
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inp->inp_label = NULL;
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}
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static void
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mac_ipq_label_free(struct label *label)
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{
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MAC_PERFORM(destroy_ipq_label, label);
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mac_labelzone_free(label);
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MAC_DEBUG_COUNTER_DEC(&nmacipqs);
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}
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void
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mac_destroy_ipq(struct ipq *ipq)
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{
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mac_ipq_label_free(ipq->ipq_label);
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ipq->ipq_label = NULL;
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}
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void
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mac_create_inpcb_from_socket(struct socket *so, struct inpcb *inp)
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{
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MAC_PERFORM(create_inpcb_from_socket, so, so->so_label, inp,
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inp->inp_label);
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}
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void
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mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
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{
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struct label *label;
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label = mac_mbuf_to_label(datagram);
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MAC_PERFORM(create_datagram_from_ipq, ipq, ipq->ipq_label,
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datagram, label);
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}
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void
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mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
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{
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struct label *datagramlabel, *fragmentlabel;
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datagramlabel = mac_mbuf_to_label(datagram);
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fragmentlabel = mac_mbuf_to_label(fragment);
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MAC_PERFORM(create_fragment, datagram, datagramlabel, fragment,
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fragmentlabel);
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}
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void
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mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
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{
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struct label *label;
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label = mac_mbuf_to_label(fragment);
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MAC_PERFORM(create_ipq, fragment, label, ipq, ipq->ipq_label);
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}
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void
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mac_create_mbuf_from_inpcb(struct inpcb *inp, struct mbuf *m)
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{
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struct label *mlabel;
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INP_LOCK_ASSERT(inp);
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mlabel = mac_mbuf_to_label(m);
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MAC_PERFORM(create_mbuf_from_inpcb, inp, inp->inp_label, m, mlabel);
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}
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int
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mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
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{
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struct label *label;
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int result;
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label = mac_mbuf_to_label(fragment);
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result = 1;
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MAC_BOOLEAN(fragment_match, &&, fragment, label, ipq,
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ipq->ipq_label);
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return (result);
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}
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void
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mac_reflect_mbuf_icmp(struct mbuf *m)
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{
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struct label *label;
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label = mac_mbuf_to_label(m);
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MAC_PERFORM(reflect_mbuf_icmp, m, label);
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}
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void
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mac_reflect_mbuf_tcp(struct mbuf *m)
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{
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struct label *label;
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label = mac_mbuf_to_label(m);
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MAC_PERFORM(reflect_mbuf_tcp, m, label);
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}
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void
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mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
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{
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struct label *label;
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label = mac_mbuf_to_label(fragment);
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MAC_PERFORM(update_ipq, fragment, label, ipq, ipq->ipq_label);
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}
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int
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mac_check_inpcb_deliver(struct inpcb *inp, struct mbuf *m)
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{
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struct label *label;
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int error;
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M_ASSERTPKTHDR(m);
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if (!mac_enforce_socket)
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return (0);
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label = mac_mbuf_to_label(m);
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MAC_CHECK(check_inpcb_deliver, inp, inp->inp_label, m, label);
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return (error);
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}
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void
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mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp)
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{
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/* XXX: assert socket lock. */
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INP_LOCK_ASSERT(inp);
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MAC_PERFORM(inpcb_sosetlabel, so, so->so_label, inp, inp->inp_label);
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}
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void
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mac_create_mbuf_from_firewall(struct mbuf *m)
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{
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struct label *label;
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M_ASSERTPKTHDR(m);
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label = mac_mbuf_to_label(m);
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MAC_PERFORM(create_mbuf_from_firewall, m, label);
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}
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