6356dba0b4
(1) Abstract interpreter vnode labeling in execve(2) and mac_execve(2)
so that the general exec code isn't aware of the details of
allocating, copying, and freeing labels, rather, simply passes in
a void pointer to start and stop functions that will be used by
the framework. This change will be MFC'd.
(2) Introduce a new flags field to the MAC_POLICY_SET(9) interface
allowing policies to declare which types of objects require label
allocation, initialization, and destruction, and define a set of
flags covering various supported object types (MPC_OBJECT_PROC,
MPC_OBJECT_VNODE, MPC_OBJECT_INPCB, ...). This change reduces the
overhead of compiling the MAC Framework into the kernel if policies
aren't loaded, or if policies require labels on only a small number
or even no object types. Each time a policy is loaded or unloaded,
we recalculate a mask of labeled object types across all policies
present in the system. Eliminate MAC_ALWAYS_LABEL_MBUF option as it
is no longer required.
MFC after: 1 week ((1) only)
Reviewed by: csjp
Obtained from: TrustedBSD Project
Sponsored by: Apple, Inc.
414 lines
9.0 KiB
C
414 lines
9.0 KiB
C
/*-
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* Copyright (c) 1999-2002, 2007 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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* Copyright (c) 2006 SPARTA, Inc.
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* Copyright (c) 2008 Apple 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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* This software was enhanced by SPARTA ISSO under SPAWAR contract
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* N66001-04-C-6019 ("SEFOS").
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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/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 <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_framework.h>
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#include <security/mac/mac_internal.h>
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#include <security/mac/mac_policy.h>
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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(inpcb_init_label, label, flag);
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if (error) {
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MAC_PERFORM(inpcb_destroy_label, label);
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mac_labelzone_free(label);
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return (NULL);
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}
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return (label);
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}
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int
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mac_inpcb_init(struct inpcb *inp, int flag)
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{
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if (mac_labeled & MPC_OBJECT_INPCB) {
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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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} else
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inp->inp_label = NULL;
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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(ipq_init_label, label, flag);
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if (error) {
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MAC_PERFORM(ipq_destroy_label, label);
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mac_labelzone_free(label);
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return (NULL);
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}
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return (label);
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}
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int
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mac_ipq_init(struct ipq *q, int flag)
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{
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if (mac_labeled & MPC_OBJECT_IPQ) {
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q->ipq_label = mac_ipq_label_alloc(flag);
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if (q->ipq_label == NULL)
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return (ENOMEM);
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} else
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q->ipq_label = NULL;
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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(inpcb_destroy_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_inpcb_destroy(struct inpcb *inp)
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{
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if (inp->inp_label != NULL) {
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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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}
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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(ipq_destroy_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_ipq_destroy(struct ipq *q)
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{
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if (q->ipq_label != NULL) {
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mac_ipq_label_free(q->ipq_label);
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q->ipq_label = NULL;
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}
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}
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void
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mac_inpcb_create(struct socket *so, struct inpcb *inp)
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{
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MAC_PERFORM(inpcb_create, so, so->so_label, inp, inp->inp_label);
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}
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void
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mac_ipq_reassemble(struct ipq *q, 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(ipq_reassemble, q, q->ipq_label, m, label);
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}
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void
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mac_netinet_fragment(struct mbuf *m, struct mbuf *frag)
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{
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struct label *mlabel, *fraglabel;
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mlabel = mac_mbuf_to_label(m);
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fraglabel = mac_mbuf_to_label(frag);
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MAC_PERFORM(netinet_fragment, m, mlabel, frag, fraglabel);
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}
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void
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mac_ipq_create(struct mbuf *m, struct ipq *q)
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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(ipq_create, m, label, q, q->ipq_label);
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}
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void
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mac_inpcb_create_mbuf(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(inpcb_create_mbuf, inp, inp->inp_label, m, mlabel);
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}
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int
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mac_ipq_match(struct mbuf *m, struct ipq *q)
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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(m);
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result = 1;
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MAC_BOOLEAN(ipq_match, &&, m, label, q, q->ipq_label);
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return (result);
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}
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void
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mac_netinet_arp_send(struct ifnet *ifp, struct mbuf *m)
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{
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struct label *mlabel;
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mlabel = mac_mbuf_to_label(m);
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MAC_IFNET_LOCK(ifp);
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MAC_PERFORM(netinet_arp_send, ifp, ifp->if_label, m, mlabel);
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MAC_IFNET_UNLOCK(ifp);
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}
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void
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mac_netinet_icmp_reply(struct mbuf *mrecv, struct mbuf *msend)
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{
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struct label *mrecvlabel, *msendlabel;
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mrecvlabel = mac_mbuf_to_label(mrecv);
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msendlabel = mac_mbuf_to_label(msend);
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MAC_PERFORM(netinet_icmp_reply, mrecv, mrecvlabel, msend,
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msendlabel);
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}
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void
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mac_netinet_icmp_replyinplace(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(netinet_icmp_replyinplace, m, label);
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}
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void
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mac_netinet_igmp_send(struct ifnet *ifp, struct mbuf *m)
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{
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struct label *mlabel;
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mlabel = mac_mbuf_to_label(m);
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MAC_IFNET_LOCK(ifp);
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MAC_PERFORM(netinet_igmp_send, ifp, ifp->if_label, m, mlabel);
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MAC_IFNET_UNLOCK(ifp);
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}
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void
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mac_netinet_tcp_reply(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(netinet_tcp_reply, m, label);
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}
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void
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mac_ipq_update(struct mbuf *m, struct ipq *q)
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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(ipq_update, m, label, q, q->ipq_label);
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}
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int
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mac_inpcb_check_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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label = mac_mbuf_to_label(m);
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MAC_CHECK(inpcb_check_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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INP_WLOCK_ASSERT(inp);
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SOCK_LOCK_ASSERT(so);
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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_netinet_firewall_reply(struct mbuf *mrecv, struct mbuf *msend)
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{
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struct label *mrecvlabel, *msendlabel;
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M_ASSERTPKTHDR(mrecv);
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M_ASSERTPKTHDR(msend);
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mrecvlabel = mac_mbuf_to_label(mrecv);
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msendlabel = mac_mbuf_to_label(msend);
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MAC_PERFORM(netinet_firewall_reply, mrecv, mrecvlabel, msend,
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msendlabel);
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}
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void
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mac_netinet_firewall_send(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(netinet_firewall_send, m, label);
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}
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/*
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* These functions really should be referencing the syncache structure
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* instead of the label. However, due to some of the complexities associated
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* with exposing this syncache structure we operate directly on it's label
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* pointer. This should be OK since we aren't making any access control
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* decisions within this code directly, we are merely allocating and copying
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* label storage so we can properly initialize mbuf labels for any packets
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* the syncache code might create.
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*/
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void
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mac_syncache_destroy(struct label **label)
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{
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if (*label != NULL) {
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MAC_PERFORM(syncache_destroy_label, *label);
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mac_labelzone_free(*label);
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*label = NULL;
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}
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}
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int
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mac_syncache_init(struct label **label)
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{
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int error;
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if (mac_labeled & MPC_OBJECT_SYNCACHE) {
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*label = mac_labelzone_alloc(M_NOWAIT);
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if (*label == NULL)
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return (ENOMEM);
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/*
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* Since we are holding the inpcb locks the policy can not
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* allocate policy specific label storage using M_WAITOK. So
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* we need to do a MAC_CHECK instead of the typical
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* MAC_PERFORM so we can propagate allocation failures back
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* to the syncache code.
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*/
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MAC_CHECK(syncache_init_label, *label, M_NOWAIT);
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if (error) {
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MAC_PERFORM(syncache_destroy_label, *label);
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mac_labelzone_free(*label);
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}
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return (error);
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} else
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*label = NULL;
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return (0);
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}
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void
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mac_syncache_create(struct label *label, struct inpcb *inp)
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{
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INP_WLOCK_ASSERT(inp);
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MAC_PERFORM(syncache_create, label, inp);
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}
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void
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mac_syncache_create_mbuf(struct label *sc_label, struct mbuf *m)
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{
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struct label *mlabel;
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M_ASSERTPKTHDR(m);
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mlabel = mac_mbuf_to_label(m);
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MAC_PERFORM(syncache_create_mbuf, sc_label, m, mlabel);
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}
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