849a8ce20b
modules are loaded by avoiding mbuf label lookups when policies aren't loaded, pushing further socket locking into MAC policy modules, and avoiding locking MAC ifnet locks when no policies are loaded: - Check mac_policies_count before looking for mbuf MAC label m_tags in MAC Framework entry points. We will still pay label lookup costs if MAC policies are present but don't require labels (typically a single mbuf header field read, but perhaps further indirection if IPSEC or other m_tag consumers are in use). - Further push socket locking for socket-related access control checks and events into MAC policies from the MAC Framework, so that sockets are only locked if a policy specifically requires a lock to protect a label. This resolves lock order issues during sonewconn() and also in local domain socket cross-connect where multiple socket locks could not be held at once for the purposes of propagatig MAC labels across multiple sockets. Eliminate mac_policy_count check in some entry points where it no longer avoids locking. - Add mac_policy_count checking in some entry points relating to network interfaces that otherwise lock a global MAC ifnet lock used to protect ifnet labels. Obtained from: TrustedBSD Project
189 lines
4.3 KiB
C
189 lines
4.3 KiB
C
/*-
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* Copyright (c) 2007-2009 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed by Robert Watson for the TrustedBSD Project.
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*
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* This software was developed at the University of Cambridge Computer
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* Laboratory with support from a grant from Google, Inc.
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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/ip6.h>
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#include <netinet6/ip6_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_ip6q_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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if (flag & M_WAITOK)
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MAC_POLICY_CHECK(ip6q_init_label, label, flag);
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else
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MAC_POLICY_CHECK_NOSLEEP(ip6q_init_label, label, flag);
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if (error) {
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MAC_POLICY_PERFORM_NOSLEEP(ip6q_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_ip6q_init(struct ip6q *q6, int flag)
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{
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if (mac_labeled & MPC_OBJECT_IP6Q) {
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q6->ip6q_label = mac_ip6q_label_alloc(flag);
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if (q6->ip6q_label == NULL)
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return (ENOMEM);
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} else
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q6->ip6q_label = NULL;
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return (0);
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}
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static void
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mac_ip6q_label_free(struct label *label)
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{
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MAC_POLICY_PERFORM_NOSLEEP(ip6q_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_ip6q_destroy(struct ip6q *q6)
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{
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if (q6->ip6q_label != NULL) {
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mac_ip6q_label_free(q6->ip6q_label);
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q6->ip6q_label = NULL;
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}
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}
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void
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mac_ip6q_reassemble(struct ip6q *q6, struct mbuf *m)
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{
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struct label *label;
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if (mac_policy_count == 0)
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return;
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label = mac_mbuf_to_label(m);
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MAC_POLICY_PERFORM_NOSLEEP(ip6q_reassemble, q6, q6->ip6q_label, m,
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label);
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}
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void
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mac_ip6q_create(struct mbuf *m, struct ip6q *q6)
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{
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struct label *label;
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if (mac_policy_count == 0)
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return;
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label = mac_mbuf_to_label(m);
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MAC_POLICY_PERFORM_NOSLEEP(ip6q_create, m, label, q6,
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q6->ip6q_label);
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}
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int
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mac_ip6q_match(struct mbuf *m, struct ip6q *q6)
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{
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struct label *label;
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int result;
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if (mac_policy_count == 0)
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return (1);
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label = mac_mbuf_to_label(m);
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result = 1;
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MAC_POLICY_BOOLEAN_NOSLEEP(ip6q_match, &&, m, label, q6,
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q6->ip6q_label);
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return (result);
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}
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void
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mac_ip6q_update(struct mbuf *m, struct ip6q *q6)
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{
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struct label *label;
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if (mac_policy_count == 0)
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return;
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label = mac_mbuf_to_label(m);
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MAC_POLICY_PERFORM_NOSLEEP(ip6q_update, m, label, q6,
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q6->ip6q_label);
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}
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void
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mac_netinet6_nd6_send(struct ifnet *ifp, struct mbuf *m)
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{
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struct label *mlabel;
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if (mac_policy_count == 0)
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return;
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mlabel = mac_mbuf_to_label(m);
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MAC_POLICY_PERFORM_NOSLEEP(netinet6_nd6_send, ifp, ifp->if_label, m,
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mlabel);
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}
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