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/*-
* 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/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 <sys/mac_policy.h>
#include <net/if.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <security/mac/mac_framework.h>
#include <security/mac/mac_internal.h>
static struct label *
mac_inpcb_label_alloc(int flag)
{
struct label *label;
int error;
label = mac_labelzone_alloc(flag);
if (label == NULL)
return (NULL);
MAC_CHECK(init_inpcb_label, label, flag);
if (error) {
MAC_PERFORM(destroy_inpcb_label, label);
mac_labelzone_free(label);
return (NULL);
}
return (label);
}
int
mac_init_inpcb(struct inpcb *inp, int flag)
{
inp->inp_label = mac_inpcb_label_alloc(flag);
if (inp->inp_label == NULL)
return (ENOMEM);
return (0);
}
static struct label *
mac_ipq_label_alloc(int flag)
{
struct label *label;
int error;
label = mac_labelzone_alloc(flag);
if (label == NULL)
return (NULL);
MAC_CHECK(init_ipq_label, label, flag);
if (error) {
MAC_PERFORM(destroy_ipq_label, label);
mac_labelzone_free(label);
return (NULL);
}
return (label);
}
int
mac_init_ipq(struct ipq *ipq, int flag)
{
ipq->ipq_label = mac_ipq_label_alloc(flag);
if (ipq->ipq_label == NULL)
return (ENOMEM);
return (0);
}
static void
mac_inpcb_label_free(struct label *label)
{
MAC_PERFORM(destroy_inpcb_label, label);
mac_labelzone_free(label);
}
void
mac_destroy_inpcb(struct inpcb *inp)
{
mac_inpcb_label_free(inp->inp_label);
inp->inp_label = NULL;
}
static void
mac_ipq_label_free(struct label *label)
{
MAC_PERFORM(destroy_ipq_label, label);
mac_labelzone_free(label);
}
void
mac_destroy_ipq(struct ipq *ipq)
{
mac_ipq_label_free(ipq->ipq_label);
ipq->ipq_label = NULL;
}
void
mac_create_inpcb_from_socket(struct socket *so, struct inpcb *inp)
{
MAC_PERFORM(create_inpcb_from_socket, so, so->so_label, inp,
inp->inp_label);
}
void
mac_create_datagram_from_ipq(struct ipq *ipq, struct mbuf *datagram)
{
struct label *label;
label = mac_mbuf_to_label(datagram);
MAC_PERFORM(create_datagram_from_ipq, ipq, ipq->ipq_label,
datagram, label);
}
void
mac_create_fragment(struct mbuf *datagram, struct mbuf *fragment)
{
struct label *datagramlabel, *fragmentlabel;
datagramlabel = mac_mbuf_to_label(datagram);
fragmentlabel = mac_mbuf_to_label(fragment);
MAC_PERFORM(create_fragment, datagram, datagramlabel, fragment,
fragmentlabel);
}
void
mac_create_ipq(struct mbuf *fragment, struct ipq *ipq)
{
struct label *label;
label = mac_mbuf_to_label(fragment);
MAC_PERFORM(create_ipq, fragment, label, ipq, ipq->ipq_label);
}
void
mac_create_mbuf_from_inpcb(struct inpcb *inp, struct mbuf *m)
{
struct label *mlabel;
INP_LOCK_ASSERT(inp);
mlabel = mac_mbuf_to_label(m);
MAC_PERFORM(create_mbuf_from_inpcb, inp, inp->inp_label, m, mlabel);
}
int
mac_fragment_match(struct mbuf *fragment, struct ipq *ipq)
{
struct label *label;
int result;
label = mac_mbuf_to_label(fragment);
result = 1;
MAC_BOOLEAN(fragment_match, &&, fragment, label, ipq,
ipq->ipq_label);
return (result);
}
void
mac_reflect_mbuf_icmp(struct mbuf *m)
{
struct label *label;
label = mac_mbuf_to_label(m);
MAC_PERFORM(reflect_mbuf_icmp, m, label);
}
void
mac_reflect_mbuf_tcp(struct mbuf *m)
{
struct label *label;
label = mac_mbuf_to_label(m);
MAC_PERFORM(reflect_mbuf_tcp, m, label);
}
void
mac_update_ipq(struct mbuf *fragment, struct ipq *ipq)
{
struct label *label;
label = mac_mbuf_to_label(fragment);
MAC_PERFORM(update_ipq, fragment, label, ipq, ipq->ipq_label);
}
int
mac_check_inpcb_deliver(struct inpcb *inp, struct mbuf *m)
{
struct label *label;
int error;
M_ASSERTPKTHDR(m);
label = mac_mbuf_to_label(m);
MAC_CHECK(check_inpcb_deliver, inp, inp->inp_label, m, label);
return (error);
}
void
mac_inpcb_sosetlabel(struct socket *so, struct inpcb *inp)
{
/* XXX: assert socket lock. */
INP_LOCK_ASSERT(inp);
MAC_PERFORM(inpcb_sosetlabel, so, so->so_label, inp, inp->inp_label);
}
void
mac_create_mbuf_from_firewall(struct mbuf *m)
{
struct label *label;
M_ASSERTPKTHDR(m);
label = mac_mbuf_to_label(m);
MAC_PERFORM(create_mbuf_from_firewall, m, label);
}
/*
* These functions really should be referencing the syncache structure
* instead of the label. However, due to some of the complexities associated
* with exposing this syncache structure we operate directly on it's label
* pointer. This should be OK since we aren't making any access control
* decisions within this code directly, we are merely allocating and copying
* label storage so we can properly initialize mbuf labels for any packets
* the syncache code might create.
*/
void
mac_destroy_syncache(struct label **label)
{
MAC_PERFORM(destroy_syncache_label, *label);
mac_labelzone_free(*label);
*label = NULL;
}
int
mac_init_syncache(struct label **label)
{
int error;
*label = mac_labelzone_alloc(M_NOWAIT);
if (*label == NULL)
return (ENOMEM);
/*
* Since we are holding the inpcb locks the policy can not allocate
* policy specific label storage using M_WAITOK. So we need to do a
* MAC_CHECK instead of the typical MAC_PERFORM so we can propagate
* allocation failures back to the syncache code.
*/
MAC_CHECK(init_syncache_label, *label, M_NOWAIT);
return (error);
}
void
mac_init_syncache_from_inpcb(struct label *label, struct inpcb *inp)
{
INP_LOCK_ASSERT(inp);
MAC_PERFORM(init_syncache_from_inpcb, label, inp);
}
void
mac_create_mbuf_from_syncache(struct label *sc_label, struct mbuf *m)
{
struct label *mbuf_label;
M_ASSERTPKTHDR(m);
mbuf_label = mac_mbuf_to_label(m);
MAC_PERFORM(create_mbuf_from_syncache, sc_label, m, mbuf_label);
}
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