5c95417dad
lock mac_ifnet_mtx, which protects labels on struct ifnet, unless at least one policy is actively using labels on ifnets. This avoids a global mutex acquire in certain fast paths -- most noticeably ifnet transmit. This was previously invisible by default, as no MAC policies were loaded by default, but recently became visible due to mac_ntpd being enabled by default. gallatin@ reports a reduction in PPS overhead from 300% to 2.2% with this change. We will want to explore further MAC Framework optimisation to reduce overhead further, but this brings things more back into the world of the sane. MFC after: 3 days
537 lines
18 KiB
C
537 lines
18 KiB
C
/*-
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* Copyright (c) 1999-2002, 2006, 2009, 2019 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 nCircle Network Security, Inc.
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* Copyright (c) 2006 SPARTA, Inc.
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* Copyright (c) 2009 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 developed by Robert N. M. Watson for the TrustedBSD
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* Project under contract to nCircle Network Security, Inc.
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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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* 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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* $FreeBSD$
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*/
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#ifndef _SECURITY_MAC_MAC_INTERNAL_H_
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#define _SECURITY_MAC_MAC_INTERNAL_H_
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#ifndef _KERNEL
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#error "no user-serviceable parts inside"
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#endif
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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/*
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* MAC Framework sysctl namespace.
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*/
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#ifdef SYSCTL_DECL
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SYSCTL_DECL(_security_mac);
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#endif /* SYSCTL_DECL */
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/*
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* MAC Framework SDT DTrace probe namespace, macros for declaring entry
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* point probes, macros for invoking them.
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*/
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#ifdef SDT_PROVIDER_DECLARE
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SDT_PROVIDER_DECLARE(mac); /* MAC Framework-level events. */
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SDT_PROVIDER_DECLARE(mac_framework); /* Entry points to MAC. */
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#define MAC_CHECK_PROBE_DEFINE4(name, arg0, arg1, arg2, arg3) \
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SDT_PROBE_DEFINE5(mac_framework, , name, mac__check__err, \
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"int", arg0, arg1, arg2, arg3); \
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SDT_PROBE_DEFINE5(mac_framework, , name, mac__check__ok, \
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"int", arg0, arg1, arg2, arg3);
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#define MAC_CHECK_PROBE_DEFINE3(name, arg0, arg1, arg2) \
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SDT_PROBE_DEFINE4(mac_framework, , name, mac__check__err, \
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"int", arg0, arg1, arg2); \
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SDT_PROBE_DEFINE4(mac_framework, , name, mac__check__ok, \
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"int", arg0, arg1, arg2);
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#define MAC_CHECK_PROBE_DEFINE2(name, arg0, arg1) \
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SDT_PROBE_DEFINE3(mac_framework, , name, mac__check__err, \
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"int", arg0, arg1); \
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SDT_PROBE_DEFINE3(mac_framework, , name, mac__check__ok, \
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"int", arg0, arg1);
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#define MAC_CHECK_PROBE_DEFINE1(name, arg0) \
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SDT_PROBE_DEFINE2(mac_framework, , name, mac__check__err, \
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"int", arg0); \
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SDT_PROBE_DEFINE2(mac_framework, , name, mac__check__ok, \
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"int", arg0);
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#define MAC_CHECK_PROBE4(name, error, arg0, arg1, arg2, arg3) do { \
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if (SDT_PROBES_ENABLED()) { \
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if (error) { \
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SDT_PROBE5(mac_framework, , name, mac__check__err,\
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error, arg0, arg1, arg2, arg3); \
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} else { \
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SDT_PROBE5(mac_framework, , name, mac__check__ok,\
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0, arg0, arg1, arg2, arg3); \
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} \
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} \
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} while (0)
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#define MAC_CHECK_PROBE3(name, error, arg0, arg1, arg2) \
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MAC_CHECK_PROBE4(name, error, arg0, arg1, arg2, 0)
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#define MAC_CHECK_PROBE2(name, error, arg0, arg1) \
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MAC_CHECK_PROBE3(name, error, arg0, arg1, 0)
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#define MAC_CHECK_PROBE1(name, error, arg0) \
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MAC_CHECK_PROBE2(name, error, arg0, 0)
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#endif
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#define MAC_GRANT_PROBE_DEFINE2(name, arg0, arg1) \
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SDT_PROBE_DEFINE3(mac_framework, , name, mac__grant__err, \
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"int", arg0, arg1); \
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SDT_PROBE_DEFINE3(mac_framework, , name, mac__grant__ok, \
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"int", arg0, arg1);
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#define MAC_GRANT_PROBE2(name, error, arg0, arg1) do { \
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if (SDT_PROBES_ENABLED()) { \
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if (error) { \
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SDT_PROBE3(mac_framework, , name, mac__grant__err,\
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error, arg0, arg1); \
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} else { \
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SDT_PROBE3(mac_framework, , name, mac__grant__ok,\
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error, arg0, arg1); \
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} \
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} \
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} while (0)
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/*
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* MAC Framework global types and typedefs.
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*/
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LIST_HEAD(mac_policy_list_head, mac_policy_conf);
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_MACTEMP);
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#endif
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/*
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* MAC labels -- in-kernel storage format.
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*
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* In general, struct label pointers are embedded in kernel data structures
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* representing objects that may be labeled (and protected). Struct label is
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* opaque to both kernel services that invoke the MAC Framework and MAC
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* policy modules. In particular, we do not wish to encode the layout of the
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* label structure into any ABIs. Historically, the slot array contained
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* unions of {long, void} but now contains uintptr_t.
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*/
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#define MAC_MAX_SLOTS 4
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#define MAC_FLAG_INITIALIZED 0x0000001 /* Is initialized for use. */
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struct label {
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int l_flags;
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intptr_t l_perpolicy[MAC_MAX_SLOTS];
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};
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/*
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* Flags for mac_labeled, a bitmask of object types need across the union of
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* all policies currently registered with the MAC Framework, used to key
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* whether or not labels are allocated and constructors for the type are
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* invoked.
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*/
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#define MPC_OBJECT_CRED 0x0000000000000001
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#define MPC_OBJECT_PROC 0x0000000000000002
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#define MPC_OBJECT_VNODE 0x0000000000000004
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#define MPC_OBJECT_INPCB 0x0000000000000008
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#define MPC_OBJECT_SOCKET 0x0000000000000010
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#define MPC_OBJECT_DEVFS 0x0000000000000020
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#define MPC_OBJECT_MBUF 0x0000000000000040
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#define MPC_OBJECT_IPQ 0x0000000000000080
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#define MPC_OBJECT_IFNET 0x0000000000000100
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#define MPC_OBJECT_BPFDESC 0x0000000000000200
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#define MPC_OBJECT_PIPE 0x0000000000000400
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#define MPC_OBJECT_MOUNT 0x0000000000000800
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#define MPC_OBJECT_POSIXSEM 0x0000000000001000
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#define MPC_OBJECT_POSIXSHM 0x0000000000002000
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#define MPC_OBJECT_SYSVMSG 0x0000000000004000
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#define MPC_OBJECT_SYSVMSQ 0x0000000000008000
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#define MPC_OBJECT_SYSVSEM 0x0000000000010000
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#define MPC_OBJECT_SYSVSHM 0x0000000000020000
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#define MPC_OBJECT_SYNCACHE 0x0000000000040000
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#define MPC_OBJECT_IP6Q 0x0000000000080000
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/*
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* MAC Framework global variables.
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*/
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extern struct mac_policy_list_head mac_policy_list;
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extern struct mac_policy_list_head mac_static_policy_list;
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extern u_int mac_policy_count;
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extern uint64_t mac_labeled;
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extern struct mtx mac_ifnet_mtx;
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/*
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* MAC Framework infrastructure functions.
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*/
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int mac_error_select(int error1, int error2);
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void mac_policy_slock_nosleep(struct rm_priotracker *tracker);
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void mac_policy_slock_sleep(void);
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void mac_policy_sunlock_nosleep(struct rm_priotracker *tracker);
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void mac_policy_sunlock_sleep(void);
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struct label *mac_labelzone_alloc(int flags);
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void mac_labelzone_free(struct label *label);
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void mac_labelzone_init(void);
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void mac_init_label(struct label *label);
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void mac_destroy_label(struct label *label);
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int mac_check_structmac_consistent(struct mac *mac);
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int mac_allocate_slot(void);
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/*
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* Lock ifnets to protect labels only if ifnet labels are in use.
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*/
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#define MAC_IFNET_LOCK(ifp, locked) do { \
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if (mac_labeled & MPC_OBJECT_IFNET) { \
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mtx_lock(&mac_ifnet_mtx); \
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locked = 1; \
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} else { \
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locked = 0; \
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} \
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} while (0)
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#define MAC_IFNET_UNLOCK(ifp, locked) do { \
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if (locked) { \
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mtx_unlock(&mac_ifnet_mtx); \
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locked = 0; \
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} \
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} while (0)
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/*
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* MAC Framework per-object type functions. It's not yet clear how the
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* namespaces, etc, should work for these, so for now, sort by object type.
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*/
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struct label *mac_cred_label_alloc(void);
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void mac_cred_label_free(struct label *label);
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struct label *mac_pipe_label_alloc(void);
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void mac_pipe_label_free(struct label *label);
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struct label *mac_socket_label_alloc(int flag);
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void mac_socket_label_free(struct label *label);
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struct label *mac_vnode_label_alloc(void);
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void mac_vnode_label_free(struct label *label);
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int mac_cred_check_relabel(struct ucred *cred, struct label *newlabel);
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int mac_cred_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen);
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int mac_cred_internalize_label(struct label *label, char *string);
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void mac_cred_relabel(struct ucred *cred, struct label *newlabel);
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struct label *mac_mbuf_to_label(struct mbuf *m);
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void mac_pipe_copy_label(struct label *src, struct label *dest);
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int mac_pipe_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen);
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int mac_pipe_internalize_label(struct label *label, char *string);
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int mac_socket_label_set(struct ucred *cred, struct socket *so,
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struct label *label);
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void mac_socket_copy_label(struct label *src, struct label *dest);
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int mac_socket_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen);
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int mac_socket_internalize_label(struct label *label, char *string);
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int mac_vnode_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen);
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int mac_vnode_internalize_label(struct label *label, char *string);
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void mac_vnode_check_mmap_downgrade(struct ucred *cred, struct vnode *vp,
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int *prot);
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int vn_setlabel(struct vnode *vp, struct label *intlabel,
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struct ucred *cred);
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/*
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* MAC Framework composition macros invoke all registered MAC policies for a
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* specific entry point. They come in two forms: one which permits policies
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* to sleep/block, and another that does not.
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*
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* MAC_POLICY_CHECK performs the designated check by walking the policy
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* module list and checking with each as to how it feels about the request.
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* Note that it returns its value via 'error' in the scope of the caller.
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*/
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#define MAC_POLICY_CHECK(check, args...) do { \
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struct mac_policy_conf *mpc; \
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\
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error = 0; \
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) \
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error = mac_error_select( \
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mpc->mpc_ops->mpo_ ## check (args), \
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error); \
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} \
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if (!LIST_EMPTY(&mac_policy_list)) { \
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mac_policy_slock_sleep(); \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) \
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error = mac_error_select( \
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mpc->mpc_ops->mpo_ ## check (args), \
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error); \
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} \
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mac_policy_sunlock_sleep(); \
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} \
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} while (0)
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#define MAC_POLICY_CHECK_NOSLEEP(check, args...) do { \
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struct mac_policy_conf *mpc; \
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\
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error = 0; \
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) \
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error = mac_error_select( \
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mpc->mpc_ops->mpo_ ## check (args), \
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error); \
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} \
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if (!LIST_EMPTY(&mac_policy_list)) { \
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struct rm_priotracker tracker; \
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\
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mac_policy_slock_nosleep(&tracker); \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) \
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error = mac_error_select( \
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mpc->mpc_ops->mpo_ ## check (args), \
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error); \
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} \
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mac_policy_sunlock_nosleep(&tracker); \
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} \
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} while (0)
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/*
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* MAC_POLICY_GRANT performs the designated check by walking the policy
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* module list and checking with each as to how it feels about the request.
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* Unlike MAC_POLICY_CHECK, it grants if any policies return '0', and
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* otherwise returns EPERM. Note that it returns its value via 'error' in
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* the scope of the caller.
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*/
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#define MAC_POLICY_GRANT_NOSLEEP(check, args...) do { \
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struct mac_policy_conf *mpc; \
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\
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error = EPERM; \
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) { \
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if (mpc->mpc_ops->mpo_ ## check(args) == 0) \
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error = 0; \
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} \
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} \
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if (!LIST_EMPTY(&mac_policy_list)) { \
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struct rm_priotracker tracker; \
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\
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mac_policy_slock_nosleep(&tracker); \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## check != NULL) { \
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if (mpc->mpc_ops->mpo_ ## check (args) \
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== 0) \
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error = 0; \
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} \
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} \
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mac_policy_sunlock_nosleep(&tracker); \
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} \
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} while (0)
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/*
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* MAC_POLICY_BOOLEAN performs the designated boolean composition by walking
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* the module list, invoking each instance of the operation, and combining
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* the results using the passed C operator. Note that it returns its value
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* via 'result' in the scope of the caller, which should be initialized by
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* the caller in a meaningful way to get a meaningful result.
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*/
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#define MAC_POLICY_BOOLEAN(operation, composition, args...) do { \
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struct mac_policy_conf *mpc; \
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\
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## operation != NULL) \
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result = result composition \
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mpc->mpc_ops->mpo_ ## operation (args); \
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} \
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if (!LIST_EMPTY(&mac_policy_list)) { \
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mac_policy_slock_sleep(); \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## operation != NULL) \
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result = result composition \
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mpc->mpc_ops->mpo_ ## operation \
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(args); \
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} \
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mac_policy_sunlock_sleep(); \
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} \
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} while (0)
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#define MAC_POLICY_BOOLEAN_NOSLEEP(operation, composition, args...) do {\
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struct mac_policy_conf *mpc; \
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\
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LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## operation != NULL) \
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result = result composition \
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mpc->mpc_ops->mpo_ ## operation (args); \
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} \
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if (!LIST_EMPTY(&mac_policy_list)) { \
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struct rm_priotracker tracker; \
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\
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mac_policy_slock_nosleep(&tracker); \
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LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
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if (mpc->mpc_ops->mpo_ ## operation != NULL) \
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result = result composition \
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mpc->mpc_ops->mpo_ ## operation \
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(args); \
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} \
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mac_policy_sunlock_nosleep(&tracker); \
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} \
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} while (0)
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/*
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* MAC_POLICY_EXTERNALIZE queries each policy to see if it can generate an
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* externalized version of a label element by name. Policies declare whether
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* they have matched a particular element name, parsed from the string by
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* MAC_POLICY_EXTERNALIZE, and an error is returned if any element is matched
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* by no policy.
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*/
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#define MAC_POLICY_EXTERNALIZE(type, label, elementlist, outbuf, \
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outbuflen) do { \
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int claimed, first, ignorenotfound, savedlen; \
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char *element_name, *element_temp; \
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struct sbuf sb; \
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\
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error = 0; \
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first = 1; \
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sbuf_new(&sb, outbuf, outbuflen, SBUF_FIXEDLEN); \
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element_temp = elementlist; \
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while ((element_name = strsep(&element_temp, ",")) != NULL) { \
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if (element_name[0] == '?') { \
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|
element_name++; \
|
|
ignorenotfound = 1; \
|
|
} else \
|
|
ignorenotfound = 0; \
|
|
savedlen = sbuf_len(&sb); \
|
|
if (first) \
|
|
error = sbuf_printf(&sb, "%s/", element_name); \
|
|
else \
|
|
error = sbuf_printf(&sb, ",%s/", element_name); \
|
|
if (error == -1) { \
|
|
error = EINVAL; /* XXX: E2BIG? */ \
|
|
break; \
|
|
} \
|
|
claimed = 0; \
|
|
MAC_POLICY_CHECK(type ## _externalize_label, label, \
|
|
element_name, &sb, &claimed); \
|
|
if (error) \
|
|
break; \
|
|
if (claimed == 0 && ignorenotfound) { \
|
|
/* Revert last label name. */ \
|
|
sbuf_setpos(&sb, savedlen); \
|
|
} else if (claimed != 1) { \
|
|
error = EINVAL; /* XXX: ENOLABEL? */ \
|
|
break; \
|
|
} else { \
|
|
first = 0; \
|
|
} \
|
|
} \
|
|
sbuf_finish(&sb); \
|
|
} while (0)
|
|
|
|
/*
|
|
* MAC_POLICY_INTERNALIZE presents parsed element names and data to each
|
|
* policy to see if any is willing to claim it and internalize the label
|
|
* data. If no policies match, an error is returned.
|
|
*/
|
|
#define MAC_POLICY_INTERNALIZE(type, label, instring) do { \
|
|
char *element, *element_name, *element_data; \
|
|
int claimed; \
|
|
\
|
|
error = 0; \
|
|
element = instring; \
|
|
while ((element_name = strsep(&element, ",")) != NULL) { \
|
|
element_data = element_name; \
|
|
element_name = strsep(&element_data, "/"); \
|
|
if (element_data == NULL) { \
|
|
error = EINVAL; \
|
|
break; \
|
|
} \
|
|
claimed = 0; \
|
|
MAC_POLICY_CHECK(type ## _internalize_label, label, \
|
|
element_name, element_data, &claimed); \
|
|
if (error) \
|
|
break; \
|
|
if (claimed != 1) { \
|
|
/* XXXMAC: Another error here? */ \
|
|
error = EINVAL; \
|
|
break; \
|
|
} \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* MAC_POLICY_PERFORM performs the designated operation by walking the policy
|
|
* module list and invoking that operation for each policy.
|
|
*/
|
|
#define MAC_POLICY_PERFORM(operation, args...) do { \
|
|
struct mac_policy_conf *mpc; \
|
|
\
|
|
LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
|
|
mpc->mpc_ops->mpo_ ## operation (args); \
|
|
} \
|
|
if (!LIST_EMPTY(&mac_policy_list)) { \
|
|
mac_policy_slock_sleep(); \
|
|
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
|
|
mpc->mpc_ops->mpo_ ## operation (args); \
|
|
} \
|
|
mac_policy_sunlock_sleep(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define MAC_POLICY_PERFORM_NOSLEEP(operation, args...) do { \
|
|
struct mac_policy_conf *mpc; \
|
|
\
|
|
LIST_FOREACH(mpc, &mac_static_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
|
|
mpc->mpc_ops->mpo_ ## operation (args); \
|
|
} \
|
|
if (!LIST_EMPTY(&mac_policy_list)) { \
|
|
struct rm_priotracker tracker; \
|
|
\
|
|
mac_policy_slock_nosleep(&tracker); \
|
|
LIST_FOREACH(mpc, &mac_policy_list, mpc_list) { \
|
|
if (mpc->mpc_ops->mpo_ ## operation != NULL) \
|
|
mpc->mpc_ops->mpo_ ## operation (args); \
|
|
} \
|
|
mac_policy_sunlock_nosleep(&tracker); \
|
|
} \
|
|
} while (0)
|
|
|
|
#endif /* !_SECURITY_MAC_MAC_INTERNAL_H_ */
|