7ffc2492ae
for the naming of variables associated with specific data structures. Obtained from: TrustedBSD Project
2962 lines
72 KiB
C
2962 lines
72 KiB
C
/*-
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* Copyright (c) 1999-2002, 2007 Robert N. M. Watson
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* Copyright (c) 2001-2005 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 for the TrustedBSD Project.
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*
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* This software was developed for the FreeBSD Project in part by NAI Labs,
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* the Security Research Division of Network Associates, Inc. under
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* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
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* 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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* $FreeBSD$
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*/
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/*
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* Developed by the TrustedBSD Project.
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*
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* Low-watermark floating label mandatory integrity policy.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/acl.h>
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#include <sys/conf.h>
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#include <sys/extattr.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/sbuf.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sx.h>
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#include <sys/pipe.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <fs/devfs/devfs.h>
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#include <net/bpfdesc.h>
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#include <net/if.h>
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#include <net/if_types.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 <vm/vm.h>
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#include <security/mac/mac_policy.h>
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#include <security/mac/mac_framework.h>
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#include <security/mac_lomac/mac_lomac.h>
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struct mac_lomac_proc {
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struct mac_lomac mac_lomac;
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struct mtx mtx;
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};
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SYSCTL_DECL(_security_mac);
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SYSCTL_NODE(_security_mac, OID_AUTO, lomac, CTLFLAG_RW, 0,
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"TrustedBSD mac_lomac policy controls");
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static int mac_lomac_label_size = sizeof(struct mac_lomac);
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SYSCTL_INT(_security_mac_lomac, OID_AUTO, label_size, CTLFLAG_RD,
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&mac_lomac_label_size, 0, "Size of struct mac_lomac");
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static int mac_lomac_enabled = 1;
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SYSCTL_INT(_security_mac_lomac, OID_AUTO, enabled, CTLFLAG_RW,
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&mac_lomac_enabled, 0, "Enforce MAC/LOMAC policy");
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TUNABLE_INT("security.mac.lomac.enabled", &mac_lomac_enabled);
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static int destroyed_not_inited;
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SYSCTL_INT(_security_mac_lomac, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
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&destroyed_not_inited, 0, "Count of labels destroyed but not inited");
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static int trust_all_interfaces = 0;
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SYSCTL_INT(_security_mac_lomac, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
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&trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/LOMAC");
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TUNABLE_INT("security.mac.lomac.trust_all_interfaces", &trust_all_interfaces);
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static char trusted_interfaces[128];
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SYSCTL_STRING(_security_mac_lomac, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
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trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/LOMAC");
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TUNABLE_STR("security.mac.lomac.trusted_interfaces", trusted_interfaces,
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sizeof(trusted_interfaces));
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static int ptys_equal = 0;
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SYSCTL_INT(_security_mac_lomac, OID_AUTO, ptys_equal, CTLFLAG_RW,
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&ptys_equal, 0, "Label pty devices as lomac/equal on create");
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TUNABLE_INT("security.mac.lomac.ptys_equal", &ptys_equal);
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static int revocation_enabled = 1;
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SYSCTL_INT(_security_mac_lomac, OID_AUTO, revocation_enabled, CTLFLAG_RW,
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&revocation_enabled, 0, "Revoke access to objects on relabel");
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TUNABLE_INT("security.mac.lomac.revocation_enabled", &revocation_enabled);
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static int mac_lomac_slot;
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#define SLOT(l) ((struct mac_lomac *)mac_label_get((l), mac_lomac_slot))
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#define SLOT_SET(l, val) mac_label_set((l), mac_lomac_slot, (uintptr_t)(val))
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#define PSLOT(l) ((struct mac_lomac_proc *) \
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mac_label_get((l), mac_lomac_slot))
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#define PSLOT_SET(l, val) mac_label_set((l), mac_lomac_slot, (uintptr_t)(val))
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MALLOC_DEFINE(M_MACLOMAC, "mac_lomac_label", "MAC/LOMAC labels");
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static struct mac_lomac *
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lomac_alloc(int flag)
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{
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struct mac_lomac *mac_lomac;
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mac_lomac = malloc(sizeof(struct mac_lomac), M_MACLOMAC, M_ZERO | flag);
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return (mac_lomac);
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}
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static void
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lomac_free(struct mac_lomac *mac_lomac)
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{
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if (mac_lomac != NULL)
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free(mac_lomac, M_MACLOMAC);
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else
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atomic_add_int(&destroyed_not_inited, 1);
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}
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static int
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lomac_atmostflags(struct mac_lomac *mac_lomac, int flags)
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{
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if ((mac_lomac->ml_flags & flags) != mac_lomac->ml_flags)
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return (EINVAL);
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return (0);
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}
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static int
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mac_lomac_dominate_element(struct mac_lomac_element *a,
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struct mac_lomac_element *b)
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{
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switch (a->mle_type) {
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case MAC_LOMAC_TYPE_EQUAL:
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case MAC_LOMAC_TYPE_HIGH:
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return (1);
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case MAC_LOMAC_TYPE_LOW:
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switch (b->mle_type) {
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case MAC_LOMAC_TYPE_GRADE:
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case MAC_LOMAC_TYPE_HIGH:
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return (0);
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case MAC_LOMAC_TYPE_EQUAL:
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case MAC_LOMAC_TYPE_LOW:
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return (1);
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default:
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panic("mac_lomac_dominate_element: b->mle_type invalid");
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}
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case MAC_LOMAC_TYPE_GRADE:
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switch (b->mle_type) {
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case MAC_LOMAC_TYPE_EQUAL:
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case MAC_LOMAC_TYPE_LOW:
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return (1);
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case MAC_LOMAC_TYPE_HIGH:
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return (0);
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case MAC_LOMAC_TYPE_GRADE:
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return (a->mle_grade >= b->mle_grade);
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default:
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panic("mac_lomac_dominate_element: b->mle_type invalid");
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}
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default:
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panic("mac_lomac_dominate_element: a->mle_type invalid");
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}
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}
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static int
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mac_lomac_range_in_range(struct mac_lomac *rangea, struct mac_lomac *rangeb)
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{
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return (mac_lomac_dominate_element(&rangeb->ml_rangehigh,
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&rangea->ml_rangehigh) &&
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mac_lomac_dominate_element(&rangea->ml_rangelow,
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&rangeb->ml_rangelow));
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}
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static int
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mac_lomac_single_in_range(struct mac_lomac *single, struct mac_lomac *range)
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{
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KASSERT((single->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
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("mac_lomac_single_in_range: a not single"));
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KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
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("mac_lomac_single_in_range: b not range"));
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return (mac_lomac_dominate_element(&range->ml_rangehigh,
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&single->ml_single) &&
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mac_lomac_dominate_element(&single->ml_single,
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&range->ml_rangelow));
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}
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static int
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mac_lomac_auxsingle_in_range(struct mac_lomac *single, struct mac_lomac *range)
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{
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KASSERT((single->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
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("mac_lomac_single_in_range: a not auxsingle"));
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KASSERT((range->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
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("mac_lomac_single_in_range: b not range"));
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return (mac_lomac_dominate_element(&range->ml_rangehigh,
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&single->ml_auxsingle) &&
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mac_lomac_dominate_element(&single->ml_auxsingle,
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&range->ml_rangelow));
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}
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static int
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mac_lomac_dominate_single(struct mac_lomac *a, struct mac_lomac *b)
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{
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KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
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("mac_lomac_dominate_single: a not single"));
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KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
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("mac_lomac_dominate_single: b not single"));
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return (mac_lomac_dominate_element(&a->ml_single, &b->ml_single));
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}
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static int
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mac_lomac_subject_dominate(struct mac_lomac *a, struct mac_lomac *b)
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{
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KASSERT((~a->ml_flags &
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(MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_RANGE)) == 0,
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("mac_lomac_dominate_single: a not subject"));
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KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
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("mac_lomac_dominate_single: b not single"));
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return (mac_lomac_dominate_element(&a->ml_rangehigh,
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&b->ml_single));
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}
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static int
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mac_lomac_equal_element(struct mac_lomac_element *a, struct mac_lomac_element *b)
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{
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if (a->mle_type == MAC_LOMAC_TYPE_EQUAL ||
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b->mle_type == MAC_LOMAC_TYPE_EQUAL)
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return (1);
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return (a->mle_type == b->mle_type && a->mle_grade == b->mle_grade);
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}
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static int
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mac_lomac_equal_single(struct mac_lomac *a, struct mac_lomac *b)
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{
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KASSERT((a->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
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("mac_lomac_equal_single: a not single"));
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KASSERT((b->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
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("mac_lomac_equal_single: b not single"));
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return (mac_lomac_equal_element(&a->ml_single, &b->ml_single));
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}
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static int
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mac_lomac_contains_equal(struct mac_lomac *mac_lomac)
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{
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if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE)
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if (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
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return (1);
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if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX)
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if (mac_lomac->ml_auxsingle.mle_type == MAC_LOMAC_TYPE_EQUAL)
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return (1);
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if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
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if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL)
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return (1);
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if (mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
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return (1);
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}
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return (0);
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}
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static int
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mac_lomac_subject_privileged(struct mac_lomac *mac_lomac)
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{
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KASSERT((mac_lomac->ml_flags & MAC_LOMAC_FLAGS_BOTH) ==
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MAC_LOMAC_FLAGS_BOTH,
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("mac_lomac_subject_privileged: subject doesn't have both labels"));
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/* If the single is EQUAL, it's ok. */
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if (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_EQUAL)
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return (0);
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/* If either range endpoint is EQUAL, it's ok. */
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if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_EQUAL ||
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mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_EQUAL)
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return (0);
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/* If the range is low-high, it's ok. */
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if (mac_lomac->ml_rangelow.mle_type == MAC_LOMAC_TYPE_LOW &&
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mac_lomac->ml_rangehigh.mle_type == MAC_LOMAC_TYPE_HIGH)
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return (0);
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/* It's not ok. */
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return (EPERM);
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}
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static int
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mac_lomac_high_single(struct mac_lomac *mac_lomac)
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{
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KASSERT((mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
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("mac_lomac_high_single: mac_lomac not single"));
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return (mac_lomac->ml_single.mle_type == MAC_LOMAC_TYPE_HIGH);
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}
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static int
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mac_lomac_valid(struct mac_lomac *mac_lomac)
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{
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if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
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switch (mac_lomac->ml_single.mle_type) {
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case MAC_LOMAC_TYPE_GRADE:
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case MAC_LOMAC_TYPE_EQUAL:
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case MAC_LOMAC_TYPE_HIGH:
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case MAC_LOMAC_TYPE_LOW:
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break;
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default:
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return (EINVAL);
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}
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} else {
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if (mac_lomac->ml_single.mle_type != MAC_LOMAC_TYPE_UNDEF)
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return (EINVAL);
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}
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if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX) {
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switch (mac_lomac->ml_auxsingle.mle_type) {
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case MAC_LOMAC_TYPE_GRADE:
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case MAC_LOMAC_TYPE_EQUAL:
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case MAC_LOMAC_TYPE_HIGH:
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case MAC_LOMAC_TYPE_LOW:
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break;
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default:
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return (EINVAL);
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}
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} else {
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if (mac_lomac->ml_auxsingle.mle_type != MAC_LOMAC_TYPE_UNDEF)
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return (EINVAL);
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}
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if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
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switch (mac_lomac->ml_rangelow.mle_type) {
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case MAC_LOMAC_TYPE_GRADE:
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case MAC_LOMAC_TYPE_EQUAL:
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case MAC_LOMAC_TYPE_HIGH:
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case MAC_LOMAC_TYPE_LOW:
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break;
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|
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default:
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return (EINVAL);
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}
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|
|
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switch (mac_lomac->ml_rangehigh.mle_type) {
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case MAC_LOMAC_TYPE_GRADE:
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case MAC_LOMAC_TYPE_EQUAL:
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case MAC_LOMAC_TYPE_HIGH:
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case MAC_LOMAC_TYPE_LOW:
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break;
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|
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default:
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return (EINVAL);
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}
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if (!mac_lomac_dominate_element(&mac_lomac->ml_rangehigh,
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&mac_lomac->ml_rangelow))
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return (EINVAL);
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} else {
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if (mac_lomac->ml_rangelow.mle_type != MAC_LOMAC_TYPE_UNDEF ||
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mac_lomac->ml_rangehigh.mle_type != MAC_LOMAC_TYPE_UNDEF)
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return (EINVAL);
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|
}
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|
|
|
return (0);
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|
}
|
|
|
|
static void
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mac_lomac_set_range(struct mac_lomac *mac_lomac, u_short typelow,
|
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u_short gradelow, u_short typehigh, u_short gradehigh)
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{
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mac_lomac->ml_rangelow.mle_type = typelow;
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mac_lomac->ml_rangelow.mle_grade = gradelow;
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mac_lomac->ml_rangehigh.mle_type = typehigh;
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mac_lomac->ml_rangehigh.mle_grade = gradehigh;
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mac_lomac->ml_flags |= MAC_LOMAC_FLAG_RANGE;
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}
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|
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static void
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mac_lomac_set_single(struct mac_lomac *mac_lomac, u_short type, u_short grade)
|
|
{
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mac_lomac->ml_single.mle_type = type;
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mac_lomac->ml_single.mle_grade = grade;
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mac_lomac->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
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}
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|
|
|
static void
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mac_lomac_copy_range(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
|
|
{
|
|
|
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KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_RANGE) != 0,
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|
("mac_lomac_copy_range: labelfrom not range"));
|
|
|
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labelto->ml_rangelow = labelfrom->ml_rangelow;
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labelto->ml_rangehigh = labelfrom->ml_rangehigh;
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labelto->ml_flags |= MAC_LOMAC_FLAG_RANGE;
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}
|
|
|
|
static void
|
|
mac_lomac_copy_single(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
|
|
{
|
|
|
|
KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_SINGLE) != 0,
|
|
("mac_lomac_copy_single: labelfrom not single"));
|
|
|
|
labelto->ml_single = labelfrom->ml_single;
|
|
labelto->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
|
|
}
|
|
|
|
static void
|
|
mac_lomac_copy_auxsingle(struct mac_lomac *labelfrom, struct mac_lomac *labelto)
|
|
{
|
|
|
|
KASSERT((labelfrom->ml_flags & MAC_LOMAC_FLAG_AUX) != 0,
|
|
("mac_lomac_copy_auxsingle: labelfrom not auxsingle"));
|
|
|
|
labelto->ml_auxsingle = labelfrom->ml_auxsingle;
|
|
labelto->ml_flags |= MAC_LOMAC_FLAG_AUX;
|
|
}
|
|
|
|
static void
|
|
mac_lomac_copy(struct mac_lomac *source, struct mac_lomac *dest)
|
|
{
|
|
|
|
if (source->ml_flags & MAC_LOMAC_FLAG_SINGLE)
|
|
mac_lomac_copy_single(source, dest);
|
|
if (source->ml_flags & MAC_LOMAC_FLAG_AUX)
|
|
mac_lomac_copy_auxsingle(source, dest);
|
|
if (source->ml_flags & MAC_LOMAC_FLAG_RANGE)
|
|
mac_lomac_copy_range(source, dest);
|
|
}
|
|
|
|
static int mac_lomac_to_string(struct sbuf *sb,
|
|
struct mac_lomac *mac_lomac);
|
|
|
|
static int
|
|
maybe_demote(struct mac_lomac *subjlabel, struct mac_lomac *objlabel,
|
|
const char *actionname, const char *objname, struct vnode *vp)
|
|
{
|
|
struct sbuf subjlabel_sb, subjtext_sb, objlabel_sb;
|
|
char *subjlabeltext, *objlabeltext, *subjtext;
|
|
struct mac_lomac cached_subjlabel;
|
|
struct mac_lomac_proc *subj;
|
|
struct vattr va;
|
|
struct proc *p;
|
|
pid_t pgid;
|
|
|
|
subj = PSLOT(curthread->td_proc->p_label);
|
|
|
|
p = curthread->td_proc;
|
|
mtx_lock(&subj->mtx);
|
|
if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
|
|
/*
|
|
* Check to see if the pending demotion would be more or
|
|
* less severe than this one, and keep the more severe.
|
|
* This can only happen for a multi-threaded application.
|
|
*/
|
|
if (mac_lomac_dominate_single(objlabel, &subj->mac_lomac)) {
|
|
mtx_unlock(&subj->mtx);
|
|
return (0);
|
|
}
|
|
}
|
|
bzero(&subj->mac_lomac, sizeof(subj->mac_lomac));
|
|
/*
|
|
* Always demote the single label.
|
|
*/
|
|
mac_lomac_copy_single(objlabel, &subj->mac_lomac);
|
|
/*
|
|
* Start with the original range, then minimize each side of
|
|
* the range to the point of not dominating the object. The
|
|
* high side will always be demoted, of course.
|
|
*/
|
|
mac_lomac_copy_range(subjlabel, &subj->mac_lomac);
|
|
if (!mac_lomac_dominate_element(&objlabel->ml_single,
|
|
&subj->mac_lomac.ml_rangelow))
|
|
subj->mac_lomac.ml_rangelow = objlabel->ml_single;
|
|
subj->mac_lomac.ml_rangehigh = objlabel->ml_single;
|
|
subj->mac_lomac.ml_flags |= MAC_LOMAC_FLAG_UPDATE;
|
|
mtx_lock_spin(&sched_lock);
|
|
curthread->td_flags |= TDF_ASTPENDING;
|
|
curthread->td_proc->p_sflag |= PS_MACPEND;
|
|
mtx_unlock_spin(&sched_lock);
|
|
|
|
/*
|
|
* Avoid memory allocation while holding a mutex; cache the
|
|
* label.
|
|
*/
|
|
mac_lomac_copy_single(&subj->mac_lomac, &cached_subjlabel);
|
|
mtx_unlock(&subj->mtx);
|
|
|
|
sbuf_new(&subjlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
|
|
mac_lomac_to_string(&subjlabel_sb, subjlabel);
|
|
sbuf_finish(&subjlabel_sb);
|
|
subjlabeltext = sbuf_data(&subjlabel_sb);
|
|
|
|
sbuf_new(&subjtext_sb, NULL, 0, SBUF_AUTOEXTEND);
|
|
mac_lomac_to_string(&subjtext_sb, &subj->mac_lomac);
|
|
sbuf_finish(&subjtext_sb);
|
|
subjtext = sbuf_data(&subjtext_sb);
|
|
|
|
sbuf_new(&objlabel_sb, NULL, 0, SBUF_AUTOEXTEND);
|
|
mac_lomac_to_string(&objlabel_sb, objlabel);
|
|
sbuf_finish(&objlabel_sb);
|
|
objlabeltext = sbuf_data(&objlabel_sb);
|
|
|
|
pgid = p->p_pgrp->pg_id; /* XXX could be stale? */
|
|
if (vp != NULL && VOP_GETATTR(vp, &va, curthread->td_ucred,
|
|
curthread) == 0) {
|
|
log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
|
|
" level %s after %s a level-%s %s (inode=%ld, "
|
|
"mountpount=%s)\n",
|
|
subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
|
|
p->p_comm, subjtext, actionname, objlabeltext, objname,
|
|
va.va_fileid, vp->v_mount->mnt_stat.f_mntonname);
|
|
} else {
|
|
log(LOG_INFO, "LOMAC: level-%s subject p%dg%du%d:%s demoted to"
|
|
" level %s after %s a level-%s %s\n",
|
|
subjlabeltext, p->p_pid, pgid, curthread->td_ucred->cr_uid,
|
|
p->p_comm, subjtext, actionname, objlabeltext, objname);
|
|
}
|
|
|
|
sbuf_delete(&subjlabel_sb);
|
|
sbuf_delete(&subjtext_sb);
|
|
sbuf_delete(&objlabel_sb);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Relabel "to" to "from" only if "from" is a valid label (contains
|
|
* at least a single), as for a relabel operation which may or may
|
|
* not involve a relevant label.
|
|
*/
|
|
static void
|
|
try_relabel(struct mac_lomac *from, struct mac_lomac *to)
|
|
{
|
|
|
|
if (from->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
|
|
bzero(to, sizeof(*to));
|
|
mac_lomac_copy(from, to);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Policy module operations.
|
|
*/
|
|
static void
|
|
mac_lomac_init(struct mac_policy_conf *conf)
|
|
{
|
|
|
|
}
|
|
|
|
/*
|
|
* Label operations.
|
|
*/
|
|
static void
|
|
mac_lomac_init_label(struct label *label)
|
|
{
|
|
|
|
SLOT_SET(label, lomac_alloc(M_WAITOK));
|
|
}
|
|
|
|
static int
|
|
mac_lomac_init_label_waitcheck(struct label *label, int flag)
|
|
{
|
|
|
|
SLOT_SET(label, lomac_alloc(flag));
|
|
if (SLOT(label) == NULL)
|
|
return (ENOMEM);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_init_proc_label(struct label *label)
|
|
{
|
|
|
|
PSLOT_SET(label, malloc(sizeof(struct mac_lomac_proc), M_MACLOMAC,
|
|
M_ZERO | M_WAITOK));
|
|
mtx_init(&PSLOT(label)->mtx, "MAC/Lomac proc lock", NULL, MTX_DEF);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_destroy_label(struct label *label)
|
|
{
|
|
|
|
lomac_free(SLOT(label));
|
|
SLOT_SET(label, NULL);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_destroy_proc_label(struct label *label)
|
|
{
|
|
|
|
mtx_destroy(&PSLOT(label)->mtx);
|
|
FREE(PSLOT(label), M_MACLOMAC);
|
|
PSLOT_SET(label, NULL);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_element_to_string(struct sbuf *sb, struct mac_lomac_element *element)
|
|
{
|
|
|
|
switch (element->mle_type) {
|
|
case MAC_LOMAC_TYPE_HIGH:
|
|
return (sbuf_printf(sb, "high"));
|
|
|
|
case MAC_LOMAC_TYPE_LOW:
|
|
return (sbuf_printf(sb, "low"));
|
|
|
|
case MAC_LOMAC_TYPE_EQUAL:
|
|
return (sbuf_printf(sb, "equal"));
|
|
|
|
case MAC_LOMAC_TYPE_GRADE:
|
|
return (sbuf_printf(sb, "%d", element->mle_grade));
|
|
|
|
default:
|
|
panic("mac_lomac_element_to_string: invalid type (%d)",
|
|
element->mle_type);
|
|
}
|
|
}
|
|
|
|
static int
|
|
mac_lomac_to_string(struct sbuf *sb, struct mac_lomac *mac_lomac)
|
|
{
|
|
|
|
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
|
|
if (mac_lomac_element_to_string(sb, &mac_lomac->ml_single)
|
|
== -1)
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_AUX) {
|
|
if (sbuf_putc(sb, '[') == -1)
|
|
return (EINVAL);
|
|
|
|
if (mac_lomac_element_to_string(sb, &mac_lomac->ml_auxsingle)
|
|
== -1)
|
|
return (EINVAL);
|
|
|
|
if (sbuf_putc(sb, ']') == -1)
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (mac_lomac->ml_flags & MAC_LOMAC_FLAG_RANGE) {
|
|
if (sbuf_putc(sb, '(') == -1)
|
|
return (EINVAL);
|
|
|
|
if (mac_lomac_element_to_string(sb, &mac_lomac->ml_rangelow)
|
|
== -1)
|
|
return (EINVAL);
|
|
|
|
if (sbuf_putc(sb, '-') == -1)
|
|
return (EINVAL);
|
|
|
|
if (mac_lomac_element_to_string(sb, &mac_lomac->ml_rangehigh)
|
|
== -1)
|
|
return (EINVAL);
|
|
|
|
if (sbuf_putc(sb, ')') == -1)
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_externalize_label(struct label *label, char *element_name,
|
|
struct sbuf *sb, int *claimed)
|
|
{
|
|
struct mac_lomac *mac_lomac;
|
|
|
|
if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
|
|
return (0);
|
|
|
|
(*claimed)++;
|
|
|
|
mac_lomac = SLOT(label);
|
|
|
|
return (mac_lomac_to_string(sb, mac_lomac));
|
|
}
|
|
|
|
static int
|
|
mac_lomac_parse_element(struct mac_lomac_element *element, char *string)
|
|
{
|
|
|
|
if (strcmp(string, "high") == 0 ||
|
|
strcmp(string, "hi") == 0) {
|
|
element->mle_type = MAC_LOMAC_TYPE_HIGH;
|
|
element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
|
|
} else if (strcmp(string, "low") == 0 ||
|
|
strcmp(string, "lo") == 0) {
|
|
element->mle_type = MAC_LOMAC_TYPE_LOW;
|
|
element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
|
|
} else if (strcmp(string, "equal") == 0 ||
|
|
strcmp(string, "eq") == 0) {
|
|
element->mle_type = MAC_LOMAC_TYPE_EQUAL;
|
|
element->mle_grade = MAC_LOMAC_TYPE_UNDEF;
|
|
} else {
|
|
char *p0, *p1;
|
|
int d;
|
|
|
|
p0 = string;
|
|
d = strtol(p0, &p1, 10);
|
|
|
|
if (d < 0 || d > 65535)
|
|
return (EINVAL);
|
|
element->mle_type = MAC_LOMAC_TYPE_GRADE;
|
|
element->mle_grade = d;
|
|
|
|
if (p1 == p0 || *p1 != '\0')
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Note: destructively consumes the string, make a local copy before
|
|
* calling if that's a problem.
|
|
*/
|
|
static int
|
|
mac_lomac_parse(struct mac_lomac *mac_lomac, char *string)
|
|
{
|
|
char *range, *rangeend, *rangehigh, *rangelow, *single, *auxsingle,
|
|
*auxsingleend;
|
|
int error;
|
|
|
|
/* Do we have a range? */
|
|
single = string;
|
|
range = index(string, '(');
|
|
if (range == single)
|
|
single = NULL;
|
|
auxsingle = index(string, '[');
|
|
if (auxsingle == single)
|
|
single = NULL;
|
|
if (range != NULL && auxsingle != NULL)
|
|
return (EINVAL);
|
|
rangelow = rangehigh = NULL;
|
|
if (range != NULL) {
|
|
/* Nul terminate the end of the single string. */
|
|
*range = '\0';
|
|
range++;
|
|
rangelow = range;
|
|
rangehigh = index(rangelow, '-');
|
|
if (rangehigh == NULL)
|
|
return (EINVAL);
|
|
rangehigh++;
|
|
if (*rangelow == '\0' || *rangehigh == '\0')
|
|
return (EINVAL);
|
|
rangeend = index(rangehigh, ')');
|
|
if (rangeend == NULL)
|
|
return (EINVAL);
|
|
if (*(rangeend + 1) != '\0')
|
|
return (EINVAL);
|
|
/* Nul terminate the ends of the ranges. */
|
|
*(rangehigh - 1) = '\0';
|
|
*rangeend = '\0';
|
|
}
|
|
KASSERT((rangelow != NULL && rangehigh != NULL) ||
|
|
(rangelow == NULL && rangehigh == NULL),
|
|
("mac_lomac_internalize_label: range mismatch"));
|
|
if (auxsingle != NULL) {
|
|
/* Nul terminate the end of the single string. */
|
|
*auxsingle = '\0';
|
|
auxsingle++;
|
|
auxsingleend = index(auxsingle, ']');
|
|
if (auxsingleend == NULL)
|
|
return (EINVAL);
|
|
if (*(auxsingleend + 1) != '\0')
|
|
return (EINVAL);
|
|
/* Nul terminate the end of the auxsingle. */
|
|
*auxsingleend = '\0';
|
|
}
|
|
|
|
bzero(mac_lomac, sizeof(*mac_lomac));
|
|
if (single != NULL) {
|
|
error = mac_lomac_parse_element(&mac_lomac->ml_single, single);
|
|
if (error)
|
|
return (error);
|
|
mac_lomac->ml_flags |= MAC_LOMAC_FLAG_SINGLE;
|
|
}
|
|
|
|
if (auxsingle != NULL) {
|
|
error = mac_lomac_parse_element(&mac_lomac->ml_auxsingle,
|
|
auxsingle);
|
|
if (error)
|
|
return (error);
|
|
mac_lomac->ml_flags |= MAC_LOMAC_FLAG_AUX;
|
|
}
|
|
|
|
if (rangelow != NULL) {
|
|
error = mac_lomac_parse_element(&mac_lomac->ml_rangelow,
|
|
rangelow);
|
|
if (error)
|
|
return (error);
|
|
error = mac_lomac_parse_element(&mac_lomac->ml_rangehigh,
|
|
rangehigh);
|
|
if (error)
|
|
return (error);
|
|
mac_lomac->ml_flags |= MAC_LOMAC_FLAG_RANGE;
|
|
}
|
|
|
|
error = mac_lomac_valid(mac_lomac);
|
|
if (error)
|
|
return (error);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_internalize_label(struct label *label, char *element_name,
|
|
char *element_data, int *claimed)
|
|
{
|
|
struct mac_lomac *mac_lomac, mac_lomac_temp;
|
|
int error;
|
|
|
|
if (strcmp(MAC_LOMAC_LABEL_NAME, element_name) != 0)
|
|
return (0);
|
|
|
|
(*claimed)++;
|
|
|
|
error = mac_lomac_parse(&mac_lomac_temp, element_data);
|
|
if (error)
|
|
return (error);
|
|
|
|
mac_lomac = SLOT(label);
|
|
*mac_lomac = mac_lomac_temp;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_copy_label(struct label *src, struct label *dest)
|
|
{
|
|
|
|
*SLOT(dest) = *SLOT(src);
|
|
}
|
|
|
|
/*
|
|
* Labeling event operations: file system objects, and things that look
|
|
* a lot like file system objects.
|
|
*/
|
|
static void
|
|
mac_lomac_create_devfs_device(struct ucred *cred, struct mount *mp,
|
|
struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
|
|
{
|
|
struct mac_lomac *mac_lomac;
|
|
int lomac_type;
|
|
|
|
mac_lomac = SLOT(delabel);
|
|
if (strcmp(dev->si_name, "null") == 0 ||
|
|
strcmp(dev->si_name, "zero") == 0 ||
|
|
strcmp(dev->si_name, "random") == 0 ||
|
|
strncmp(dev->si_name, "fd/", strlen("fd/")) == 0 ||
|
|
strncmp(dev->si_name, "ttyv", strlen("ttyv")) == 0)
|
|
lomac_type = MAC_LOMAC_TYPE_EQUAL;
|
|
else if (ptys_equal &&
|
|
(strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
|
|
strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
|
|
lomac_type = MAC_LOMAC_TYPE_EQUAL;
|
|
else
|
|
lomac_type = MAC_LOMAC_TYPE_HIGH;
|
|
mac_lomac_set_single(mac_lomac, lomac_type, 0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_devfs_directory(struct mount *mp, char *dirname,
|
|
int dirnamelen, struct devfs_dirent *de, struct label *delabel)
|
|
{
|
|
struct mac_lomac *mac_lomac;
|
|
|
|
mac_lomac = SLOT(delabel);
|
|
mac_lomac_set_single(mac_lomac, MAC_LOMAC_TYPE_HIGH, 0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_devfs_symlink(struct ucred *cred, struct mount *mp,
|
|
struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
|
|
struct label *delabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(delabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mount(struct ucred *cred, struct mount *mp,
|
|
struct label *mplabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(mplabel);
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_relabel_vnode(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(vplabel);
|
|
|
|
try_relabel(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_update_devfsdirent(struct mount *mp, struct devfs_dirent *de,
|
|
struct label *delabel, struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(vplabel);
|
|
dest = SLOT(delabel);
|
|
|
|
mac_lomac_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_associate_vnode_devfs(struct mount *mp, struct label *mplabel,
|
|
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(delabel);
|
|
dest = SLOT(vplabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_associate_vnode_extattr(struct mount *mp, struct label *mplabel,
|
|
struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_lomac temp, *source, *dest;
|
|
int buflen, error;
|
|
|
|
source = SLOT(mplabel);
|
|
dest = SLOT(vplabel);
|
|
|
|
buflen = sizeof(temp);
|
|
bzero(&temp, buflen);
|
|
|
|
error = vn_extattr_get(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
|
|
MAC_LOMAC_EXTATTR_NAME, &buflen, (char *)&temp, curthread);
|
|
if (error == ENOATTR || error == EOPNOTSUPP) {
|
|
/* Fall back to the mntlabel. */
|
|
mac_lomac_copy_single(source, dest);
|
|
return (0);
|
|
} else if (error)
|
|
return (error);
|
|
|
|
if (buflen != sizeof(temp)) {
|
|
if (buflen != sizeof(temp) - sizeof(temp.ml_auxsingle)) {
|
|
printf("mac_lomac_associate_vnode_extattr: bad size %d\n",
|
|
buflen);
|
|
return (EPERM);
|
|
}
|
|
bzero(&temp.ml_auxsingle, sizeof(temp.ml_auxsingle));
|
|
buflen = sizeof(temp);
|
|
(void)vn_extattr_set(vp, IO_NODELOCKED,
|
|
MAC_LOMAC_EXTATTR_NAMESPACE, MAC_LOMAC_EXTATTR_NAME,
|
|
buflen, (char *)&temp, curthread);
|
|
}
|
|
if (mac_lomac_valid(&temp) != 0) {
|
|
printf("mac_lomac_associate_vnode_extattr: invalid\n");
|
|
return (EPERM);
|
|
}
|
|
if ((temp.ml_flags & MAC_LOMAC_FLAGS_BOTH) != MAC_LOMAC_FLAG_SINGLE) {
|
|
printf("mac_lomac_associate_vnode_extattr: not single\n");
|
|
return (EPERM);
|
|
}
|
|
|
|
mac_lomac_copy_single(&temp, dest);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_associate_vnode_singlelabel(struct mount *mp,
|
|
struct label *mplabel, struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(mplabel);
|
|
dest = SLOT(vplabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_create_vnode_extattr(struct ucred *cred, struct mount *mp,
|
|
struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
|
|
struct vnode *vp, struct label *vplabel, struct componentname *cnp)
|
|
{
|
|
struct mac_lomac *source, *dest, *dir, temp;
|
|
size_t buflen;
|
|
int error;
|
|
|
|
buflen = sizeof(temp);
|
|
bzero(&temp, buflen);
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(vplabel);
|
|
dir = SLOT(dvplabel);
|
|
if (dir->ml_flags & MAC_LOMAC_FLAG_AUX) {
|
|
mac_lomac_copy_auxsingle(dir, &temp);
|
|
mac_lomac_set_single(&temp, dir->ml_auxsingle.mle_type,
|
|
dir->ml_auxsingle.mle_grade);
|
|
} else {
|
|
mac_lomac_copy_single(source, &temp);
|
|
}
|
|
|
|
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
|
|
MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
|
|
if (error == 0)
|
|
mac_lomac_copy(&temp, dest);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct label *intlabel)
|
|
{
|
|
struct mac_lomac *source, temp;
|
|
size_t buflen;
|
|
int error;
|
|
|
|
buflen = sizeof(temp);
|
|
bzero(&temp, buflen);
|
|
|
|
source = SLOT(intlabel);
|
|
if ((source->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
|
|
return (0);
|
|
|
|
mac_lomac_copy_single(source, &temp);
|
|
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_LOMAC_EXTATTR_NAMESPACE,
|
|
MAC_LOMAC_EXTATTR_NAME, buflen, (char *)&temp, curthread);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Labeling event operations: IPC object.
|
|
*/
|
|
static void
|
|
mac_lomac_create_inpcb_from_socket(struct socket *so, struct label *solabel,
|
|
struct inpcb *inp, struct label *inplabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(solabel);
|
|
dest = SLOT(inplabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_from_socket(struct socket *so, struct label *solabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(solabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_socket(struct ucred *cred, struct socket *so,
|
|
struct label *solabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(solabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_pipe(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(pplabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_socket_from_socket(struct socket *oldso,
|
|
struct label *oldsolabel, struct socket *newso, struct label *newsolabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(oldsolabel);
|
|
dest = SLOT(newsolabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_relabel_socket(struct ucred *cred, struct socket *so,
|
|
struct label *solabel, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(solabel);
|
|
|
|
try_relabel(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_relabel_pipe(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(pplabel);
|
|
|
|
try_relabel(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_set_socket_peer_from_mbuf(struct mbuf *m, struct label *mlabel,
|
|
struct socket *so, struct label *sopeerlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(sopeerlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
/*
|
|
* Labeling event operations: network objects.
|
|
*/
|
|
static void
|
|
mac_lomac_set_socket_peer_from_socket(struct socket *oldso,
|
|
struct label *oldsolabel, struct socket *newso,
|
|
struct label *newsopeerlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(oldsolabel);
|
|
dest = SLOT(newsopeerlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_bpfdesc(struct ucred *cred, struct bpf_d *d,
|
|
struct label *dlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(dlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_ifnet(struct ifnet *ifp, struct label *ifplabel)
|
|
{
|
|
char tifname[IFNAMSIZ], *p, *q;
|
|
char tiflist[sizeof(trusted_interfaces)];
|
|
struct mac_lomac *dest;
|
|
int len, grade;
|
|
|
|
dest = SLOT(ifplabel);
|
|
|
|
if (ifp->if_type == IFT_LOOP) {
|
|
grade = MAC_LOMAC_TYPE_EQUAL;
|
|
goto set;
|
|
}
|
|
|
|
if (trust_all_interfaces) {
|
|
grade = MAC_LOMAC_TYPE_HIGH;
|
|
goto set;
|
|
}
|
|
|
|
grade = MAC_LOMAC_TYPE_LOW;
|
|
|
|
if (trusted_interfaces[0] == '\0' ||
|
|
!strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
|
|
goto set;
|
|
|
|
bzero(tiflist, sizeof(tiflist));
|
|
for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
|
|
if(*p != ' ' && *p != '\t')
|
|
*q = *p;
|
|
|
|
for (p = q = tiflist;; p++) {
|
|
if (*p == ',' || *p == '\0') {
|
|
len = p - q;
|
|
if (len < IFNAMSIZ) {
|
|
bzero(tifname, sizeof(tifname));
|
|
bcopy(q, tifname, len);
|
|
if (strcmp(tifname, ifp->if_xname) == 0) {
|
|
grade = MAC_LOMAC_TYPE_HIGH;
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
*p = '\0';
|
|
printf("MAC/LOMAC warning: interface name "
|
|
"\"%s\" is too long (must be < %d)\n",
|
|
q, IFNAMSIZ);
|
|
}
|
|
if (*p == '\0')
|
|
break;
|
|
q = p + 1;
|
|
}
|
|
}
|
|
set:
|
|
mac_lomac_set_single(dest, grade, 0);
|
|
mac_lomac_set_range(dest, grade, 0, grade, 0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_ipq(struct mbuf *m, struct label *mlabel, struct ipq *ipq,
|
|
struct label *ipqlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(ipqlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(ipqlabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
/* Just use the head, since we require them all to match. */
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_fragment(struct mbuf *m, struct label *mlabel,
|
|
struct mbuf *frag, struct label *fraglabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(fraglabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_from_inpcb(struct inpcb *inp, struct label *inplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(inplabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_linklayer(struct ifnet *ifp, struct label *ifplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *dest;
|
|
|
|
dest = SLOT(mlabel);
|
|
|
|
mac_lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_from_bpfdesc(struct bpf_d *d, struct label *dlabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(dlabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_from_ifnet(struct ifnet *ifp, struct label *ifplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(ifplabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_multicast_encap(struct mbuf *m, struct label *mlabel,
|
|
struct ifnet *ifp, struct label *ifplabel, struct mbuf *mnew,
|
|
struct label *mnewlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(mnewlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_netlayer(struct mbuf *m, struct label *mlabel,
|
|
struct mbuf *mnew, struct label *mnewlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(mnewlabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_fragment_match(struct mbuf *m, struct label *mlabel,
|
|
struct ipq *ipq, struct label *ipqlabel)
|
|
{
|
|
struct mac_lomac *a, *b;
|
|
|
|
a = SLOT(ipqlabel);
|
|
b = SLOT(mlabel);
|
|
|
|
return (mac_lomac_equal_single(a, b));
|
|
}
|
|
|
|
static void
|
|
mac_lomac_relabel_ifnet(struct ucred *cred, struct ifnet *ifp,
|
|
struct label *ifplabel, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(ifplabel);
|
|
|
|
try_relabel(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_update_ipq(struct mbuf *m, struct label *mlabel, struct ipq *ipq,
|
|
struct label *ipqlabel)
|
|
{
|
|
|
|
/* NOOP: we only accept matching labels, so no need to update */
|
|
}
|
|
|
|
static void
|
|
mac_lomac_inpcb_sosetlabel(struct socket *so, struct label *solabel,
|
|
struct inpcb *inp, struct label *inplabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(solabel);
|
|
dest = SLOT(inplabel);
|
|
|
|
mac_lomac_copy_single(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_init_syncache_from_inpcb(struct label *label, struct inpcb *inp)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(inp->inp_label);
|
|
dest = SLOT(label);
|
|
mac_lomac_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_from_syncache(struct label *sc_label, struct mbuf *m,
|
|
struct label *mlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(sc_label);
|
|
dest = SLOT(mlabel);
|
|
mac_lomac_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_mbuf_from_firewall(struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *dest;
|
|
|
|
dest = SLOT(mlabel);
|
|
|
|
/* XXX: where is the label for the firewall really comming from? */
|
|
mac_lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
|
|
}
|
|
|
|
/*
|
|
* Labeling event operations: processes.
|
|
*/
|
|
static void
|
|
mac_lomac_execve_transition(struct ucred *old, struct ucred *new,
|
|
struct vnode *vp, struct label *vplabel, struct label *interpvnodelabel,
|
|
struct image_params *imgp, struct label *execlabel)
|
|
{
|
|
struct mac_lomac *source, *dest, *obj, *robj;
|
|
|
|
source = SLOT(old->cr_label);
|
|
dest = SLOT(new->cr_label);
|
|
obj = SLOT(vplabel);
|
|
robj = interpvnodelabel != NULL ? SLOT(interpvnodelabel) : obj;
|
|
|
|
mac_lomac_copy(source, dest);
|
|
/*
|
|
* If there's an auxiliary label on the real object, respect it
|
|
* and assume that this level should be assumed immediately if
|
|
* a higher level is currently in place.
|
|
*/
|
|
if (robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
|
|
!mac_lomac_dominate_element(&robj->ml_auxsingle, &dest->ml_single)
|
|
&& mac_lomac_auxsingle_in_range(robj, dest))
|
|
mac_lomac_set_single(dest, robj->ml_auxsingle.mle_type,
|
|
robj->ml_auxsingle.mle_grade);
|
|
/*
|
|
* Restructuring to use the execve transitioning mechanism
|
|
* instead of the normal demotion mechanism here would be
|
|
* difficult, so just copy the label over and perform standard
|
|
* demotion. This is also non-optimal because it will result
|
|
* in the intermediate label "new" being created and immediately
|
|
* recycled.
|
|
*/
|
|
if (mac_lomac_enabled && revocation_enabled &&
|
|
!mac_lomac_dominate_single(obj, source))
|
|
(void)maybe_demote(source, obj, "executing", "file", vp);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_execve_will_transition(struct ucred *old, struct vnode *vp,
|
|
struct label *vplabel, struct label *interpvnodelabel,
|
|
struct image_params *imgp, struct label *execlabel)
|
|
{
|
|
struct mac_lomac *subj, *obj, *robj;
|
|
|
|
if (!mac_lomac_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(old->cr_label);
|
|
obj = SLOT(vplabel);
|
|
robj = interpvnodelabel != NULL ? SLOT(interpvnodelabel) : obj;
|
|
|
|
return ((robj->ml_flags & MAC_LOMAC_FLAG_AUX &&
|
|
!mac_lomac_dominate_element(&robj->ml_auxsingle, &subj->ml_single)
|
|
&& mac_lomac_auxsingle_in_range(robj, subj)) ||
|
|
!mac_lomac_dominate_single(obj, subj));
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_proc0(struct ucred *cred)
|
|
{
|
|
struct mac_lomac *dest;
|
|
|
|
dest = SLOT(cred->cr_label);
|
|
|
|
mac_lomac_set_single(dest, MAC_LOMAC_TYPE_EQUAL, 0);
|
|
mac_lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH,
|
|
0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_create_proc1(struct ucred *cred)
|
|
{
|
|
struct mac_lomac *dest;
|
|
|
|
dest = SLOT(cred->cr_label);
|
|
|
|
mac_lomac_set_single(dest, MAC_LOMAC_TYPE_HIGH, 0);
|
|
mac_lomac_set_range(dest, MAC_LOMAC_TYPE_LOW, 0, MAC_LOMAC_TYPE_HIGH,
|
|
0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_relabel_cred(struct ucred *cred, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(cred->cr_label);
|
|
|
|
try_relabel(source, dest);
|
|
}
|
|
|
|
/*
|
|
* Access control checks.
|
|
*/
|
|
static int
|
|
mac_lomac_check_bpfdesc_receive(struct bpf_d *d, struct label *dlabel,
|
|
struct ifnet *ifp, struct label *ifplabel)
|
|
{
|
|
struct mac_lomac *a, *b;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
a = SLOT(dlabel);
|
|
b = SLOT(ifplabel);
|
|
|
|
if (mac_lomac_equal_single(a, b))
|
|
return (0);
|
|
return (EACCES);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_cred_relabel(struct ucred *cred, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *subj, *new;
|
|
int error;
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
new = SLOT(newlabel);
|
|
|
|
/*
|
|
* If there is a LOMAC label update for the credential, it may
|
|
* be an update of the single, range, or both.
|
|
*/
|
|
error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* If the LOMAC label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
|
|
/*
|
|
* Fill in the missing parts from the previous label.
|
|
*/
|
|
if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
|
|
mac_lomac_copy_single(subj, new);
|
|
if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
|
|
mac_lomac_copy_range(subj, new);
|
|
|
|
/*
|
|
* To change the LOMAC range on a credential, the new
|
|
* range label must be in the current range.
|
|
*/
|
|
if (!mac_lomac_range_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the LOMAC single label on a credential, the
|
|
* new single label must be in the new range. Implicitly
|
|
* from the previous check, the new single is in the old
|
|
* range.
|
|
*/
|
|
if (!mac_lomac_single_in_range(new, new))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To have EQUAL in any component of the new credential
|
|
* LOMAC label, the subject must already have EQUAL in
|
|
* their label.
|
|
*/
|
|
if (mac_lomac_contains_equal(new)) {
|
|
error = mac_lomac_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* XXXMAC: Additional consistency tests regarding the
|
|
* single and range of the new label might be performed
|
|
* here.
|
|
*/
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_cred_visible(struct ucred *cr1, struct ucred *cr2)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cr1->cr_label);
|
|
obj = SLOT(cr2->cr_label);
|
|
|
|
/* XXX: range */
|
|
if (!mac_lomac_dominate_single(obj, subj))
|
|
return (ESRCH);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
|
|
struct label *ifplabel, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *subj, *new;
|
|
int error;
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
new = SLOT(newlabel);
|
|
|
|
/*
|
|
* If there is a LOMAC label update for the interface, it may
|
|
* be an update of the single, range, or both.
|
|
*/
|
|
error = lomac_atmostflags(new, MAC_LOMAC_FLAGS_BOTH);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Relabling network interfaces requires LOMAC privilege.
|
|
*/
|
|
error = mac_lomac_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* If the LOMAC label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->ml_flags & MAC_LOMAC_FLAGS_BOTH) {
|
|
/*
|
|
* Fill in the missing parts from the previous label.
|
|
*/
|
|
if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
|
|
mac_lomac_copy_single(subj, new);
|
|
if ((new->ml_flags & MAC_LOMAC_FLAG_RANGE) == 0)
|
|
mac_lomac_copy_range(subj, new);
|
|
|
|
/*
|
|
* Rely on the traditional superuser status for the LOMAC
|
|
* interface relabel requirements. XXXMAC: This will go
|
|
* away.
|
|
*
|
|
* XXXRW: This is also redundant to a higher layer check.
|
|
*/
|
|
error = priv_check_cred(cred, PRIV_NET_SETIFMAC, 0);
|
|
if (error)
|
|
return (EPERM);
|
|
|
|
/*
|
|
* XXXMAC: Additional consistency tests regarding the single
|
|
* and the range of the new label might be performed here.
|
|
*/
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_ifnet_transmit(struct ifnet *ifp, struct label *ifplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *p, *i;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
p = SLOT(mlabel);
|
|
i = SLOT(ifplabel);
|
|
|
|
return (mac_lomac_single_in_range(p, i) ? 0 : EACCES);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_inpcb_deliver(struct inpcb *inp, struct label *inplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *p, *i;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
p = SLOT(mlabel);
|
|
i = SLOT(inplabel);
|
|
|
|
return (mac_lomac_equal_single(p, i) ? 0 : EACCES);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_kld_load(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (mac_lomac_subject_privileged(subj))
|
|
return (EPERM);
|
|
|
|
if (!mac_lomac_high_single(obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_pipe_ioctl(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
|
|
{
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
/* XXX: This will be implemented soon... */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_pipe_read(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(pplabel);
|
|
|
|
if (!mac_lomac_dominate_single(obj, subj))
|
|
return (maybe_demote(subj, obj, "reading", "pipe", NULL));
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_pipe_relabel(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *subj, *obj, *new;
|
|
int error;
|
|
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(pplabel);
|
|
|
|
/*
|
|
* If there is a LOMAC label update for a pipe, it must be a
|
|
* single update.
|
|
*/
|
|
error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To perform a relabel of a pipe (LOMAC label or not), LOMAC must
|
|
* authorize the relabel.
|
|
*/
|
|
if (!mac_lomac_single_in_range(obj, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the LOMAC label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
|
|
/*
|
|
* To change the LOMAC label on a pipe, the new pipe label
|
|
* must be in the subject range.
|
|
*/
|
|
if (!mac_lomac_single_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the LOMAC label on a pipe to be EQUAL, the
|
|
* subject must have appropriate privilege.
|
|
*/
|
|
if (mac_lomac_contains_equal(new)) {
|
|
error = mac_lomac_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_pipe_write(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(pplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_proc_debug(struct ucred *cred, struct proc *p)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(p->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mac_lomac_dominate_single(obj, subj))
|
|
return (ESRCH);
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_proc_sched(struct ucred *cred, struct proc *p)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(p->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mac_lomac_dominate_single(obj, subj))
|
|
return (ESRCH);
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_proc_signal(struct ucred *cred, struct proc *p, int signum)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(p->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mac_lomac_dominate_single(obj, subj))
|
|
return (ESRCH);
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_socket_deliver(struct socket *so, struct label *solabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_lomac *p, *s;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
p = SLOT(mlabel);
|
|
s = SLOT(solabel);
|
|
|
|
return (mac_lomac_equal_single(p, s) ? 0 : EACCES);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_socket_relabel(struct ucred *cred, struct socket *so,
|
|
struct label *solabel, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *subj, *obj, *new;
|
|
int error;
|
|
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(solabel);
|
|
|
|
/*
|
|
* If there is a LOMAC label update for the socket, it may be
|
|
* an update of single.
|
|
*/
|
|
error = lomac_atmostflags(new, MAC_LOMAC_FLAG_SINGLE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To relabel a socket, the old socket single must be in the subject
|
|
* range.
|
|
*/
|
|
if (!mac_lomac_single_in_range(obj, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the LOMAC label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
|
|
/*
|
|
* To relabel a socket, the new socket single must be in
|
|
* the subject range.
|
|
*/
|
|
if (!mac_lomac_single_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the LOMAC label on the socket to contain EQUAL,
|
|
* the subject must have appropriate privilege.
|
|
*/
|
|
if (mac_lomac_contains_equal(new)) {
|
|
error = mac_lomac_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_socket_visible(struct ucred *cred, struct socket *so,
|
|
struct label *solabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(solabel);
|
|
|
|
if (!mac_lomac_dominate_single(obj, subj))
|
|
return (ENOENT);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Some system privileges are allowed regardless of integrity grade; others
|
|
* are allowed only when running with privilege with respect to the LOMAC
|
|
* policy as they might otherwise allow bypassing of the integrity policy.
|
|
*/
|
|
static int
|
|
mac_lomac_priv_check(struct ucred *cred, int priv)
|
|
{
|
|
struct mac_lomac *subj;
|
|
int error;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
/*
|
|
* Exempt only specific privileges from the LOMAC integrity policy.
|
|
*/
|
|
switch (priv) {
|
|
case PRIV_KTRACE:
|
|
case PRIV_MSGBUF:
|
|
|
|
/*
|
|
* Allow processes to manipulate basic process audit properties, and
|
|
* to submit audit records.
|
|
*/
|
|
case PRIV_AUDIT_GETAUDIT:
|
|
case PRIV_AUDIT_SETAUDIT:
|
|
case PRIV_AUDIT_SUBMIT:
|
|
|
|
/*
|
|
* Allow processes to manipulate their regular UNIX credentials.
|
|
*/
|
|
case PRIV_CRED_SETUID:
|
|
case PRIV_CRED_SETEUID:
|
|
case PRIV_CRED_SETGID:
|
|
case PRIV_CRED_SETEGID:
|
|
case PRIV_CRED_SETGROUPS:
|
|
case PRIV_CRED_SETREUID:
|
|
case PRIV_CRED_SETREGID:
|
|
case PRIV_CRED_SETRESUID:
|
|
case PRIV_CRED_SETRESGID:
|
|
|
|
/*
|
|
* Allow processes to perform system monitoring.
|
|
*/
|
|
case PRIV_SEEOTHERGIDS:
|
|
case PRIV_SEEOTHERUIDS:
|
|
break;
|
|
|
|
/*
|
|
* Allow access to general process debugging facilities. We
|
|
* separately control debugging based on MAC label.
|
|
*/
|
|
case PRIV_DEBUG_DIFFCRED:
|
|
case PRIV_DEBUG_SUGID:
|
|
case PRIV_DEBUG_UNPRIV:
|
|
|
|
/*
|
|
* Allow manipulating jails.
|
|
*/
|
|
case PRIV_JAIL_ATTACH:
|
|
|
|
/*
|
|
* Allow privilege with respect to the Partition policy, but not the
|
|
* Privs policy.
|
|
*/
|
|
case PRIV_MAC_PARTITION:
|
|
|
|
/*
|
|
* Allow privilege with respect to process resource limits and login
|
|
* context.
|
|
*/
|
|
case PRIV_PROC_LIMIT:
|
|
case PRIV_PROC_SETLOGIN:
|
|
case PRIV_PROC_SETRLIMIT:
|
|
|
|
/*
|
|
* Allow System V and POSIX IPC privileges.
|
|
*/
|
|
case PRIV_IPC_READ:
|
|
case PRIV_IPC_WRITE:
|
|
case PRIV_IPC_ADMIN:
|
|
case PRIV_IPC_MSGSIZE:
|
|
case PRIV_MQ_ADMIN:
|
|
|
|
/*
|
|
* Allow certain scheduler manipulations -- possibly this should be
|
|
* controlled by more fine-grained policy, as potentially low
|
|
* integrity processes can deny CPU to higher integrity ones.
|
|
*/
|
|
case PRIV_SCHED_DIFFCRED:
|
|
case PRIV_SCHED_SETPRIORITY:
|
|
case PRIV_SCHED_RTPRIO:
|
|
case PRIV_SCHED_SETPOLICY:
|
|
case PRIV_SCHED_SET:
|
|
case PRIV_SCHED_SETPARAM:
|
|
|
|
/*
|
|
* More IPC privileges.
|
|
*/
|
|
case PRIV_SEM_WRITE:
|
|
|
|
/*
|
|
* Allow signaling privileges subject to integrity policy.
|
|
*/
|
|
case PRIV_SIGNAL_DIFFCRED:
|
|
case PRIV_SIGNAL_SUGID:
|
|
|
|
/*
|
|
* Allow access to only limited sysctls from lower integrity levels;
|
|
* piggy-back on the Jail definition.
|
|
*/
|
|
case PRIV_SYSCTL_WRITEJAIL:
|
|
|
|
/*
|
|
* Allow TTY-based privileges, subject to general device access using
|
|
* labels on TTY device nodes, but not console privilege.
|
|
*/
|
|
case PRIV_TTY_DRAINWAIT:
|
|
case PRIV_TTY_DTRWAIT:
|
|
case PRIV_TTY_EXCLUSIVE:
|
|
case PRIV_TTY_PRISON:
|
|
case PRIV_TTY_STI:
|
|
case PRIV_TTY_SETA:
|
|
|
|
/*
|
|
* Grant most VFS privileges, as almost all are in practice bounded
|
|
* by more specific checks using labels.
|
|
*/
|
|
case PRIV_VFS_READ:
|
|
case PRIV_VFS_WRITE:
|
|
case PRIV_VFS_ADMIN:
|
|
case PRIV_VFS_EXEC:
|
|
case PRIV_VFS_LOOKUP:
|
|
case PRIV_VFS_CHFLAGS_DEV:
|
|
case PRIV_VFS_CHOWN:
|
|
case PRIV_VFS_CHROOT:
|
|
case PRIV_VFS_RETAINSUGID:
|
|
case PRIV_VFS_EXCEEDQUOTA:
|
|
case PRIV_VFS_FCHROOT:
|
|
case PRIV_VFS_FHOPEN:
|
|
case PRIV_VFS_FHSTATFS:
|
|
case PRIV_VFS_GENERATION:
|
|
case PRIV_VFS_GETFH:
|
|
case PRIV_VFS_GETQUOTA:
|
|
case PRIV_VFS_LINK:
|
|
case PRIV_VFS_MOUNT:
|
|
case PRIV_VFS_MOUNT_OWNER:
|
|
case PRIV_VFS_MOUNT_PERM:
|
|
case PRIV_VFS_MOUNT_SUIDDIR:
|
|
case PRIV_VFS_MOUNT_NONUSER:
|
|
case PRIV_VFS_SETGID:
|
|
case PRIV_VFS_STICKYFILE:
|
|
case PRIV_VFS_SYSFLAGS:
|
|
case PRIV_VFS_UNMOUNT:
|
|
|
|
/*
|
|
* Allow VM privileges; it would be nice if these were subject to
|
|
* resource limits.
|
|
*/
|
|
case PRIV_VM_MADV_PROTECT:
|
|
case PRIV_VM_MLOCK:
|
|
case PRIV_VM_MUNLOCK:
|
|
|
|
/*
|
|
* Allow some but not all network privileges. In general, dont allow
|
|
* reconfiguring the network stack, just normal use.
|
|
*/
|
|
case PRIV_NETATALK_RESERVEDPORT:
|
|
case PRIV_NETINET_RESERVEDPORT:
|
|
case PRIV_NETINET_RAW:
|
|
case PRIV_NETINET_REUSEPORT:
|
|
case PRIV_NETIPX_RESERVEDPORT:
|
|
case PRIV_NETIPX_RAW:
|
|
break;
|
|
|
|
/*
|
|
* All remaining system privileges are allow only if the process
|
|
* holds privilege with respect to the LOMAC policy.
|
|
*/
|
|
default:
|
|
subj = SLOT(cred->cr_label);
|
|
error = mac_lomac_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
static int
|
|
mac_lomac_check_system_acct(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (mac_lomac_subject_privileged(subj))
|
|
return (EPERM);
|
|
|
|
if (!mac_lomac_high_single(obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_system_auditctl(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (mac_lomac_subject_privileged(subj))
|
|
return (EPERM);
|
|
|
|
if (!mac_lomac_high_single(obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_system_swapoff(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_lomac *subj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
|
|
if (mac_lomac_subject_privileged(subj))
|
|
return (EPERM);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_system_swapon(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (mac_lomac_subject_privileged(subj))
|
|
return (EPERM);
|
|
|
|
if (!mac_lomac_high_single(obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_system_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
|
|
void *arg1, int arg2, struct sysctl_req *req)
|
|
{
|
|
struct mac_lomac *subj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
|
|
/*
|
|
* Treat sysctl variables without CTLFLAG_ANYBODY flag as
|
|
* lomac/high, but also require privilege to change them.
|
|
*/
|
|
if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
|
|
#ifdef notdef
|
|
if (!mac_lomac_subject_dominate_high(subj))
|
|
return (EACCES);
|
|
#endif
|
|
|
|
if (mac_lomac_subject_privileged(subj))
|
|
return (EPERM);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_create(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
if (obj->ml_flags & MAC_LOMAC_FLAG_AUX &&
|
|
!mac_lomac_dominate_element(&subj->ml_single, &obj->ml_auxsingle))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_delete(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, acl_type_t type)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_link(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_mmap(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, int prot, int flags)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
/*
|
|
* Rely on the use of open()-time protections to handle
|
|
* non-revocation cases.
|
|
*/
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
|
|
if (!mac_lomac_dominate_single(obj, subj))
|
|
return (maybe_demote(subj, obj, "mapping", "file", vp));
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_check_vnode_mmap_downgrade(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, /* XXX vm_prot_t */ int *prot)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
/*
|
|
* Rely on the use of open()-time protections to handle
|
|
* non-revocation cases.
|
|
*/
|
|
if (!mac_lomac_enabled || !revocation_enabled)
|
|
return;
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
*prot &= ~VM_PROT_WRITE;
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_open(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, int acc_mode)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
/* XXX privilege override for admin? */
|
|
if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_dominate_single(obj, subj))
|
|
return (maybe_demote(subj, obj, "reading", "file", vp));
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct label *newlabel)
|
|
{
|
|
struct mac_lomac *old, *new, *subj;
|
|
int error;
|
|
|
|
old = SLOT(vplabel);
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(cred->cr_label);
|
|
|
|
/*
|
|
* If there is a LOMAC label update for the vnode, it must be a
|
|
* single label, with an optional explicit auxiliary single.
|
|
*/
|
|
error = lomac_atmostflags(new,
|
|
MAC_LOMAC_FLAG_SINGLE | MAC_LOMAC_FLAG_AUX);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To perform a relabel of the vnode (LOMAC label or not), LOMAC must
|
|
* authorize the relabel.
|
|
*/
|
|
if (!mac_lomac_single_in_range(old, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the LOMAC label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->ml_flags & MAC_LOMAC_FLAG_SINGLE) {
|
|
/*
|
|
* To change the LOMAC label on a vnode, the new vnode label
|
|
* must be in the subject range.
|
|
*/
|
|
if (!mac_lomac_single_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the LOMAC label on the vnode to be EQUAL,
|
|
* the subject must have appropriate privilege.
|
|
*/
|
|
if (mac_lomac_contains_equal(new)) {
|
|
error = mac_lomac_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
if (new->ml_flags & MAC_LOMAC_FLAG_AUX) {
|
|
/*
|
|
* Fill in the missing parts from the previous label.
|
|
*/
|
|
if ((new->ml_flags & MAC_LOMAC_FLAG_SINGLE) == 0)
|
|
mac_lomac_copy_single(subj, new);
|
|
|
|
/*
|
|
* To change the auxiliary LOMAC label on a vnode, the new
|
|
* vnode label must be in the subject range.
|
|
*/
|
|
if (!mac_lomac_auxsingle_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the auxiliary LOMAC label on the vnode to be
|
|
* EQUAL, the subject must have appropriate privilege.
|
|
*/
|
|
if (mac_lomac_contains_equal(new)) {
|
|
error = mac_lomac_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
|
int samedir, struct componentname *cnp)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
if (vp != NULL) {
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_revoke(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_setacl(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, acl_type_t type, struct acl *acl)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, int attrnamespace, const char *name,
|
|
struct uio *uio)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
/* XXX: protect the MAC EA in a special way? */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_setflags(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, u_long flags)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_setmode(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, mode_t mode)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, uid_t uid, gid_t gid)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct timespec atime, struct timespec mtime)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mac_lomac_check_vnode_write(struct ucred *active_cred,
|
|
struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_lomac *subj, *obj;
|
|
|
|
if (!mac_lomac_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mac_lomac_subject_dominate(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mac_lomac_thread_userret(struct thread *td)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct mac_lomac_proc *subj = PSLOT(p->p_label);
|
|
struct ucred *newcred, *oldcred;
|
|
int dodrop;
|
|
|
|
mtx_lock(&subj->mtx);
|
|
if (subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) {
|
|
dodrop = 0;
|
|
mtx_unlock(&subj->mtx);
|
|
newcred = crget();
|
|
/*
|
|
* Prevent a lock order reversal in
|
|
* mac_cred_mmapped_drop_perms; ideally, the other
|
|
* user of subj->mtx wouldn't be holding Giant.
|
|
*/
|
|
mtx_lock(&Giant);
|
|
PROC_LOCK(p);
|
|
mtx_lock(&subj->mtx);
|
|
/*
|
|
* Check if we lost the race while allocating the cred.
|
|
*/
|
|
if ((subj->mac_lomac.ml_flags & MAC_LOMAC_FLAG_UPDATE) == 0) {
|
|
crfree(newcred);
|
|
goto out;
|
|
}
|
|
oldcred = p->p_ucred;
|
|
crcopy(newcred, oldcred);
|
|
crhold(newcred);
|
|
mac_lomac_copy(&subj->mac_lomac, SLOT(newcred->cr_label));
|
|
p->p_ucred = newcred;
|
|
crfree(oldcred);
|
|
dodrop = 1;
|
|
out:
|
|
mtx_unlock(&subj->mtx);
|
|
PROC_UNLOCK(p);
|
|
if (dodrop)
|
|
mac_cred_mmapped_drop_perms(curthread, newcred);
|
|
mtx_unlock(&Giant);
|
|
} else {
|
|
mtx_unlock(&subj->mtx);
|
|
}
|
|
}
|
|
|
|
static struct mac_policy_ops mac_lomac_ops =
|
|
{
|
|
.mpo_init = mac_lomac_init,
|
|
.mpo_init_bpfdesc_label = mac_lomac_init_label,
|
|
.mpo_init_cred_label = mac_lomac_init_label,
|
|
.mpo_init_devfsdirent_label = mac_lomac_init_label,
|
|
.mpo_init_ifnet_label = mac_lomac_init_label,
|
|
.mpo_init_syncache_label = mac_lomac_init_label_waitcheck,
|
|
.mpo_init_inpcb_label = mac_lomac_init_label_waitcheck,
|
|
.mpo_init_ipq_label = mac_lomac_init_label_waitcheck,
|
|
.mpo_init_mbuf_label = mac_lomac_init_label_waitcheck,
|
|
.mpo_init_mount_label = mac_lomac_init_label,
|
|
.mpo_init_pipe_label = mac_lomac_init_label,
|
|
.mpo_init_proc_label = mac_lomac_init_proc_label,
|
|
.mpo_init_socket_label = mac_lomac_init_label_waitcheck,
|
|
.mpo_init_socket_peer_label = mac_lomac_init_label_waitcheck,
|
|
.mpo_init_vnode_label = mac_lomac_init_label,
|
|
.mpo_init_syncache_from_inpcb = mac_lomac_init_syncache_from_inpcb,
|
|
.mpo_destroy_bpfdesc_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_cred_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_devfsdirent_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_ifnet_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_inpcb_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_ipq_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_mbuf_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_mount_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_pipe_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_proc_label = mac_lomac_destroy_proc_label,
|
|
.mpo_destroy_syncache_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_socket_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_socket_peer_label = mac_lomac_destroy_label,
|
|
.mpo_destroy_vnode_label = mac_lomac_destroy_label,
|
|
.mpo_copy_cred_label = mac_lomac_copy_label,
|
|
.mpo_copy_ifnet_label = mac_lomac_copy_label,
|
|
.mpo_copy_mbuf_label = mac_lomac_copy_label,
|
|
.mpo_copy_pipe_label = mac_lomac_copy_label,
|
|
.mpo_copy_socket_label = mac_lomac_copy_label,
|
|
.mpo_copy_vnode_label = mac_lomac_copy_label,
|
|
.mpo_externalize_cred_label = mac_lomac_externalize_label,
|
|
.mpo_externalize_ifnet_label = mac_lomac_externalize_label,
|
|
.mpo_externalize_pipe_label = mac_lomac_externalize_label,
|
|
.mpo_externalize_socket_label = mac_lomac_externalize_label,
|
|
.mpo_externalize_socket_peer_label = mac_lomac_externalize_label,
|
|
.mpo_externalize_vnode_label = mac_lomac_externalize_label,
|
|
.mpo_internalize_cred_label = mac_lomac_internalize_label,
|
|
.mpo_internalize_ifnet_label = mac_lomac_internalize_label,
|
|
.mpo_internalize_pipe_label = mac_lomac_internalize_label,
|
|
.mpo_internalize_socket_label = mac_lomac_internalize_label,
|
|
.mpo_internalize_vnode_label = mac_lomac_internalize_label,
|
|
.mpo_create_devfs_device = mac_lomac_create_devfs_device,
|
|
.mpo_create_devfs_directory = mac_lomac_create_devfs_directory,
|
|
.mpo_create_devfs_symlink = mac_lomac_create_devfs_symlink,
|
|
.mpo_create_mount = mac_lomac_create_mount,
|
|
.mpo_relabel_vnode = mac_lomac_relabel_vnode,
|
|
.mpo_update_devfsdirent = mac_lomac_update_devfsdirent,
|
|
.mpo_associate_vnode_devfs = mac_lomac_associate_vnode_devfs,
|
|
.mpo_associate_vnode_extattr = mac_lomac_associate_vnode_extattr,
|
|
.mpo_associate_vnode_singlelabel =
|
|
mac_lomac_associate_vnode_singlelabel,
|
|
.mpo_create_vnode_extattr = mac_lomac_create_vnode_extattr,
|
|
.mpo_setlabel_vnode_extattr = mac_lomac_setlabel_vnode_extattr,
|
|
.mpo_create_mbuf_from_socket = mac_lomac_create_mbuf_from_socket,
|
|
.mpo_create_mbuf_from_syncache = mac_lomac_create_mbuf_from_syncache,
|
|
.mpo_create_pipe = mac_lomac_create_pipe,
|
|
.mpo_create_socket = mac_lomac_create_socket,
|
|
.mpo_create_socket_from_socket = mac_lomac_create_socket_from_socket,
|
|
.mpo_relabel_pipe = mac_lomac_relabel_pipe,
|
|
.mpo_relabel_socket = mac_lomac_relabel_socket,
|
|
.mpo_set_socket_peer_from_mbuf = mac_lomac_set_socket_peer_from_mbuf,
|
|
.mpo_set_socket_peer_from_socket =
|
|
mac_lomac_set_socket_peer_from_socket,
|
|
.mpo_create_bpfdesc = mac_lomac_create_bpfdesc,
|
|
.mpo_create_datagram_from_ipq = mac_lomac_create_datagram_from_ipq,
|
|
.mpo_create_fragment = mac_lomac_create_fragment,
|
|
.mpo_create_ifnet = mac_lomac_create_ifnet,
|
|
.mpo_create_inpcb_from_socket = mac_lomac_create_inpcb_from_socket,
|
|
.mpo_create_ipq = mac_lomac_create_ipq,
|
|
.mpo_create_mbuf_from_inpcb = mac_lomac_create_mbuf_from_inpcb,
|
|
.mpo_create_mbuf_linklayer = mac_lomac_create_mbuf_linklayer,
|
|
.mpo_create_mbuf_from_bpfdesc = mac_lomac_create_mbuf_from_bpfdesc,
|
|
.mpo_create_mbuf_from_ifnet = mac_lomac_create_mbuf_from_ifnet,
|
|
.mpo_create_mbuf_multicast_encap =
|
|
mac_lomac_create_mbuf_multicast_encap,
|
|
.mpo_create_mbuf_netlayer = mac_lomac_create_mbuf_netlayer,
|
|
.mpo_fragment_match = mac_lomac_fragment_match,
|
|
.mpo_relabel_ifnet = mac_lomac_relabel_ifnet,
|
|
.mpo_update_ipq = mac_lomac_update_ipq,
|
|
.mpo_inpcb_sosetlabel = mac_lomac_inpcb_sosetlabel,
|
|
.mpo_execve_transition = mac_lomac_execve_transition,
|
|
.mpo_execve_will_transition = mac_lomac_execve_will_transition,
|
|
.mpo_create_proc0 = mac_lomac_create_proc0,
|
|
.mpo_create_proc1 = mac_lomac_create_proc1,
|
|
.mpo_relabel_cred = mac_lomac_relabel_cred,
|
|
.mpo_check_bpfdesc_receive = mac_lomac_check_bpfdesc_receive,
|
|
.mpo_check_cred_relabel = mac_lomac_check_cred_relabel,
|
|
.mpo_check_cred_visible = mac_lomac_check_cred_visible,
|
|
.mpo_check_ifnet_relabel = mac_lomac_check_ifnet_relabel,
|
|
.mpo_check_ifnet_transmit = mac_lomac_check_ifnet_transmit,
|
|
.mpo_check_inpcb_deliver = mac_lomac_check_inpcb_deliver,
|
|
.mpo_check_kld_load = mac_lomac_check_kld_load,
|
|
.mpo_check_pipe_ioctl = mac_lomac_check_pipe_ioctl,
|
|
.mpo_check_pipe_read = mac_lomac_check_pipe_read,
|
|
.mpo_check_pipe_relabel = mac_lomac_check_pipe_relabel,
|
|
.mpo_check_pipe_write = mac_lomac_check_pipe_write,
|
|
.mpo_check_proc_debug = mac_lomac_check_proc_debug,
|
|
.mpo_check_proc_sched = mac_lomac_check_proc_sched,
|
|
.mpo_check_proc_signal = mac_lomac_check_proc_signal,
|
|
.mpo_check_socket_deliver = mac_lomac_check_socket_deliver,
|
|
.mpo_check_socket_relabel = mac_lomac_check_socket_relabel,
|
|
.mpo_check_socket_visible = mac_lomac_check_socket_visible,
|
|
.mpo_check_system_acct = mac_lomac_check_system_acct,
|
|
.mpo_check_system_auditctl = mac_lomac_check_system_auditctl,
|
|
.mpo_check_system_swapoff = mac_lomac_check_system_swapoff,
|
|
.mpo_check_system_swapon = mac_lomac_check_system_swapon,
|
|
.mpo_check_system_sysctl = mac_lomac_check_system_sysctl,
|
|
.mpo_check_vnode_access = mac_lomac_check_vnode_open,
|
|
.mpo_check_vnode_create = mac_lomac_check_vnode_create,
|
|
.mpo_check_vnode_delete = mac_lomac_check_vnode_delete,
|
|
.mpo_check_vnode_deleteacl = mac_lomac_check_vnode_deleteacl,
|
|
.mpo_check_vnode_link = mac_lomac_check_vnode_link,
|
|
.mpo_check_vnode_mmap = mac_lomac_check_vnode_mmap,
|
|
.mpo_check_vnode_mmap_downgrade = mac_lomac_check_vnode_mmap_downgrade,
|
|
.mpo_check_vnode_open = mac_lomac_check_vnode_open,
|
|
.mpo_check_vnode_read = mac_lomac_check_vnode_read,
|
|
.mpo_check_vnode_relabel = mac_lomac_check_vnode_relabel,
|
|
.mpo_check_vnode_rename_from = mac_lomac_check_vnode_rename_from,
|
|
.mpo_check_vnode_rename_to = mac_lomac_check_vnode_rename_to,
|
|
.mpo_check_vnode_revoke = mac_lomac_check_vnode_revoke,
|
|
.mpo_check_vnode_setacl = mac_lomac_check_vnode_setacl,
|
|
.mpo_check_vnode_setextattr = mac_lomac_check_vnode_setextattr,
|
|
.mpo_check_vnode_setflags = mac_lomac_check_vnode_setflags,
|
|
.mpo_check_vnode_setmode = mac_lomac_check_vnode_setmode,
|
|
.mpo_check_vnode_setowner = mac_lomac_check_vnode_setowner,
|
|
.mpo_check_vnode_setutimes = mac_lomac_check_vnode_setutimes,
|
|
.mpo_check_vnode_write = mac_lomac_check_vnode_write,
|
|
.mpo_thread_userret = mac_lomac_thread_userret,
|
|
.mpo_create_mbuf_from_firewall = mac_lomac_create_mbuf_from_firewall,
|
|
.mpo_priv_check = mac_lomac_priv_check,
|
|
};
|
|
|
|
MAC_POLICY_SET(&mac_lomac_ops, mac_lomac, "TrustedBSD MAC/LOMAC",
|
|
MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS,
|
|
&mac_lomac_slot);
|