3424 lines
74 KiB
C
3424 lines
74 KiB
C
/*-
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* Copyright (c) 1999-2002, 2007-2011 Robert N. M. Watson
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* Copyright (c) 2001-2005 McAfee, Inc.
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* Copyright (c) 2006 SPARTA, 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 McAfee
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* Research, the Security Research Division of McAfee, 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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* This software was enhanced by SPARTA ISSO under SPAWAR contract
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* N66001-04-C-6019 ("SEFOS").
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*
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* This software was developed at the University of Cambridge Computer
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* Laboratory with support from a grant from Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Developed by the TrustedBSD Project.
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*
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* MLS fixed label mandatory confidentiality 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/ksem.h>
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#include <sys/mman.h>
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#include <sys/malloc.h>
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#include <sys/mount.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/pipe.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/msg.h>
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#include <sys/sem.h>
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#include <sys/shm.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/uma.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_mls/mac_mls.h>
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SYSCTL_DECL(_security_mac);
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static SYSCTL_NODE(_security_mac, OID_AUTO, mls,
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CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"TrustedBSD mac_mls policy controls");
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static int mls_label_size = sizeof(struct mac_mls);
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SYSCTL_INT(_security_mac_mls, OID_AUTO, label_size, CTLFLAG_RD,
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&mls_label_size, 0, "Size of struct mac_mls");
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static int mls_enabled = 1;
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SYSCTL_INT(_security_mac_mls, OID_AUTO, enabled, CTLFLAG_RWTUN, &mls_enabled, 0,
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"Enforce MAC/MLS policy");
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static int destroyed_not_inited;
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SYSCTL_INT(_security_mac_mls, 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 ptys_equal = 0;
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SYSCTL_INT(_security_mac_mls, OID_AUTO, ptys_equal, CTLFLAG_RWTUN,
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&ptys_equal, 0, "Label pty devices as mls/equal on create");
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static int revocation_enabled = 0;
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SYSCTL_INT(_security_mac_mls, OID_AUTO, revocation_enabled, CTLFLAG_RWTUN,
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&revocation_enabled, 0, "Revoke access to objects on relabel");
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static int max_compartments = MAC_MLS_MAX_COMPARTMENTS;
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SYSCTL_INT(_security_mac_mls, OID_AUTO, max_compartments, CTLFLAG_RD,
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&max_compartments, 0, "Maximum compartments the policy supports");
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static int mls_slot;
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#define SLOT(l) ((struct mac_mls *)mac_label_get((l), mls_slot))
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#define SLOT_SET(l, val) mac_label_set((l), mls_slot, (uintptr_t)(val))
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static uma_zone_t zone_mls;
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static __inline int
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mls_bit_set_empty(u_char *set) {
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int i;
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for (i = 0; i < MAC_MLS_MAX_COMPARTMENTS >> 3; i++)
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if (set[i] != 0)
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return (0);
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return (1);
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}
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static struct mac_mls *
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mls_alloc(int flag)
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{
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return (uma_zalloc(zone_mls, flag | M_ZERO));
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}
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static void
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mls_free(struct mac_mls *mm)
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{
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if (mm != NULL)
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uma_zfree(zone_mls, mm);
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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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mls_atmostflags(struct mac_mls *mm, int flags)
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{
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if ((mm->mm_flags & flags) != mm->mm_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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mls_dominate_element(struct mac_mls_element *a, struct mac_mls_element *b)
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{
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int bit;
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switch (a->mme_type) {
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case MAC_MLS_TYPE_EQUAL:
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case MAC_MLS_TYPE_HIGH:
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return (1);
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case MAC_MLS_TYPE_LOW:
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switch (b->mme_type) {
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case MAC_MLS_TYPE_LEVEL:
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case MAC_MLS_TYPE_HIGH:
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return (0);
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case MAC_MLS_TYPE_EQUAL:
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case MAC_MLS_TYPE_LOW:
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return (1);
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default:
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panic("mls_dominate_element: b->mme_type invalid");
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}
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case MAC_MLS_TYPE_LEVEL:
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switch (b->mme_type) {
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case MAC_MLS_TYPE_EQUAL:
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case MAC_MLS_TYPE_LOW:
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return (1);
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case MAC_MLS_TYPE_HIGH:
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return (0);
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case MAC_MLS_TYPE_LEVEL:
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for (bit = 1; bit <= MAC_MLS_MAX_COMPARTMENTS; bit++)
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if (!MAC_MLS_BIT_TEST(bit,
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a->mme_compartments) &&
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MAC_MLS_BIT_TEST(bit, b->mme_compartments))
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return (0);
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return (a->mme_level >= b->mme_level);
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default:
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panic("mls_dominate_element: b->mme_type invalid");
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}
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default:
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panic("mls_dominate_element: a->mme_type invalid");
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}
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return (0);
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}
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static int
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mls_range_in_range(struct mac_mls *rangea, struct mac_mls *rangeb)
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{
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return (mls_dominate_element(&rangeb->mm_rangehigh,
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&rangea->mm_rangehigh) &&
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mls_dominate_element(&rangea->mm_rangelow,
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&rangeb->mm_rangelow));
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}
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static int
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mls_effective_in_range(struct mac_mls *effective, struct mac_mls *range)
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{
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KASSERT((effective->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
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("mls_effective_in_range: a not effective"));
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KASSERT((range->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
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("mls_effective_in_range: b not range"));
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return (mls_dominate_element(&range->mm_rangehigh,
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&effective->mm_effective) &&
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mls_dominate_element(&effective->mm_effective,
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&range->mm_rangelow));
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return (1);
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}
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static int
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mls_dominate_effective(struct mac_mls *a, struct mac_mls *b)
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{
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KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
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("mls_dominate_effective: a not effective"));
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KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
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("mls_dominate_effective: b not effective"));
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return (mls_dominate_element(&a->mm_effective, &b->mm_effective));
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}
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static int
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mls_equal_element(struct mac_mls_element *a, struct mac_mls_element *b)
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{
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if (a->mme_type == MAC_MLS_TYPE_EQUAL ||
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b->mme_type == MAC_MLS_TYPE_EQUAL)
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return (1);
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return (a->mme_type == b->mme_type && a->mme_level == b->mme_level);
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}
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static int
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mls_equal_effective(struct mac_mls *a, struct mac_mls *b)
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{
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KASSERT((a->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
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("mls_equal_effective: a not effective"));
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KASSERT((b->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
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("mls_equal_effective: b not effective"));
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return (mls_equal_element(&a->mm_effective, &b->mm_effective));
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}
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static int
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mls_contains_equal(struct mac_mls *mm)
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{
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if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE)
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if (mm->mm_effective.mme_type == MAC_MLS_TYPE_EQUAL)
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return (1);
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if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
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if (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL)
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return (1);
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if (mm->mm_rangehigh.mme_type == MAC_MLS_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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mls_subject_privileged(struct mac_mls *mm)
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{
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KASSERT((mm->mm_flags & MAC_MLS_FLAGS_BOTH) == MAC_MLS_FLAGS_BOTH,
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("mls_subject_privileged: subject doesn't have both labels"));
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/* If the effective is EQUAL, it's ok. */
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if (mm->mm_effective.mme_type == MAC_MLS_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 (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_EQUAL ||
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mm->mm_rangehigh.mme_type == MAC_MLS_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 (mm->mm_rangelow.mme_type == MAC_MLS_TYPE_LOW &&
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mm->mm_rangehigh.mme_type == MAC_MLS_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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mls_valid(struct mac_mls *mm)
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{
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if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
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switch (mm->mm_effective.mme_type) {
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case MAC_MLS_TYPE_LEVEL:
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break;
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case MAC_MLS_TYPE_EQUAL:
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case MAC_MLS_TYPE_HIGH:
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case MAC_MLS_TYPE_LOW:
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if (mm->mm_effective.mme_level != 0 ||
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!MAC_MLS_BIT_SET_EMPTY(
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mm->mm_effective.mme_compartments))
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return (EINVAL);
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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 (mm->mm_effective.mme_type != MAC_MLS_TYPE_UNDEF)
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return (EINVAL);
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}
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if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
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switch (mm->mm_rangelow.mme_type) {
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case MAC_MLS_TYPE_LEVEL:
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break;
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case MAC_MLS_TYPE_EQUAL:
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case MAC_MLS_TYPE_HIGH:
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case MAC_MLS_TYPE_LOW:
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if (mm->mm_rangelow.mme_level != 0 ||
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!MAC_MLS_BIT_SET_EMPTY(
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mm->mm_rangelow.mme_compartments))
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return (EINVAL);
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break;
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default:
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return (EINVAL);
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}
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switch (mm->mm_rangehigh.mme_type) {
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case MAC_MLS_TYPE_LEVEL:
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break;
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case MAC_MLS_TYPE_EQUAL:
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case MAC_MLS_TYPE_HIGH:
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case MAC_MLS_TYPE_LOW:
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if (mm->mm_rangehigh.mme_level != 0 ||
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!MAC_MLS_BIT_SET_EMPTY(
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mm->mm_rangehigh.mme_compartments))
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return (EINVAL);
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break;
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default:
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return (EINVAL);
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}
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if (!mls_dominate_element(&mm->mm_rangehigh,
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&mm->mm_rangelow))
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return (EINVAL);
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} else {
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if (mm->mm_rangelow.mme_type != MAC_MLS_TYPE_UNDEF ||
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mm->mm_rangehigh.mme_type != MAC_MLS_TYPE_UNDEF)
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return (EINVAL);
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}
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return (0);
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}
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static void
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mls_set_range(struct mac_mls *mm, u_short typelow, u_short levellow,
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u_char *compartmentslow, u_short typehigh, u_short levelhigh,
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u_char *compartmentshigh)
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{
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mm->mm_rangelow.mme_type = typelow;
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mm->mm_rangelow.mme_level = levellow;
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if (compartmentslow != NULL)
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memcpy(mm->mm_rangelow.mme_compartments, compartmentslow,
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sizeof(mm->mm_rangelow.mme_compartments));
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mm->mm_rangehigh.mme_type = typehigh;
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mm->mm_rangehigh.mme_level = levelhigh;
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if (compartmentshigh != NULL)
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memcpy(mm->mm_rangehigh.mme_compartments, compartmentshigh,
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sizeof(mm->mm_rangehigh.mme_compartments));
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mm->mm_flags |= MAC_MLS_FLAG_RANGE;
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}
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static void
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mls_set_effective(struct mac_mls *mm, u_short type, u_short level,
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u_char *compartments)
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{
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mm->mm_effective.mme_type = type;
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mm->mm_effective.mme_level = level;
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if (compartments != NULL)
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memcpy(mm->mm_effective.mme_compartments, compartments,
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sizeof(mm->mm_effective.mme_compartments));
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mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
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}
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static void
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mls_copy_range(struct mac_mls *labelfrom, struct mac_mls *labelto)
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{
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KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_RANGE) != 0,
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("mls_copy_range: labelfrom not range"));
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labelto->mm_rangelow = labelfrom->mm_rangelow;
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labelto->mm_rangehigh = labelfrom->mm_rangehigh;
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labelto->mm_flags |= MAC_MLS_FLAG_RANGE;
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}
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static void
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mls_copy_effective(struct mac_mls *labelfrom, struct mac_mls *labelto)
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{
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KASSERT((labelfrom->mm_flags & MAC_MLS_FLAG_EFFECTIVE) != 0,
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("mls_copy_effective: labelfrom not effective"));
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labelto->mm_effective = labelfrom->mm_effective;
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labelto->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
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}
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static void
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mls_copy(struct mac_mls *source, struct mac_mls *dest)
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{
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if (source->mm_flags & MAC_MLS_FLAG_EFFECTIVE)
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mls_copy_effective(source, dest);
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if (source->mm_flags & MAC_MLS_FLAG_RANGE)
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mls_copy_range(source, dest);
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}
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/*
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* Policy module operations.
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*/
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static void
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mls_init(struct mac_policy_conf *conf)
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{
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zone_mls = uma_zcreate("mac_mls", sizeof(struct mac_mls), NULL,
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NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
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}
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/*
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* Label operations.
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*/
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static void
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mls_init_label(struct label *label)
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{
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SLOT_SET(label, mls_alloc(M_WAITOK));
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}
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static int
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mls_init_label_waitcheck(struct label *label, int flag)
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{
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SLOT_SET(label, mls_alloc(flag));
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if (SLOT(label) == NULL)
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return (ENOMEM);
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return (0);
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}
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static void
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mls_destroy_label(struct label *label)
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{
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mls_free(SLOT(label));
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SLOT_SET(label, NULL);
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}
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/*
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* mls_element_to_string() accepts an sbuf and MLS element. It converts the
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* MLS element to a string and stores the result in the sbuf; if there isn't
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* space in the sbuf, -1 is returned.
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*/
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static int
|
|
mls_element_to_string(struct sbuf *sb, struct mac_mls_element *element)
|
|
{
|
|
int i, first;
|
|
|
|
switch (element->mme_type) {
|
|
case MAC_MLS_TYPE_HIGH:
|
|
return (sbuf_printf(sb, "high"));
|
|
|
|
case MAC_MLS_TYPE_LOW:
|
|
return (sbuf_printf(sb, "low"));
|
|
|
|
case MAC_MLS_TYPE_EQUAL:
|
|
return (sbuf_printf(sb, "equal"));
|
|
|
|
case MAC_MLS_TYPE_LEVEL:
|
|
if (sbuf_printf(sb, "%d", element->mme_level) == -1)
|
|
return (-1);
|
|
|
|
first = 1;
|
|
for (i = 1; i <= MAC_MLS_MAX_COMPARTMENTS; i++) {
|
|
if (MAC_MLS_BIT_TEST(i, element->mme_compartments)) {
|
|
if (first) {
|
|
if (sbuf_putc(sb, ':') == -1)
|
|
return (-1);
|
|
if (sbuf_printf(sb, "%d", i) == -1)
|
|
return (-1);
|
|
first = 0;
|
|
} else {
|
|
if (sbuf_printf(sb, "+%d", i) == -1)
|
|
return (-1);
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
|
|
default:
|
|
panic("mls_element_to_string: invalid type (%d)",
|
|
element->mme_type);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* mls_to_string() converts an MLS label to a string, and places the results
|
|
* in the passed sbuf. It returns 0 on success, or EINVAL if there isn't
|
|
* room in the sbuf. Note: the sbuf will be modified even in a failure case,
|
|
* so the caller may need to revert the sbuf by restoring the offset if
|
|
* that's undesired.
|
|
*/
|
|
static int
|
|
mls_to_string(struct sbuf *sb, struct mac_mls *mm)
|
|
{
|
|
|
|
if (mm->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
|
|
if (mls_element_to_string(sb, &mm->mm_effective) == -1)
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (mm->mm_flags & MAC_MLS_FLAG_RANGE) {
|
|
if (sbuf_putc(sb, '(') == -1)
|
|
return (EINVAL);
|
|
|
|
if (mls_element_to_string(sb, &mm->mm_rangelow) == -1)
|
|
return (EINVAL);
|
|
|
|
if (sbuf_putc(sb, '-') == -1)
|
|
return (EINVAL);
|
|
|
|
if (mls_element_to_string(sb, &mm->mm_rangehigh) == -1)
|
|
return (EINVAL);
|
|
|
|
if (sbuf_putc(sb, ')') == -1)
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_externalize_label(struct label *label, char *element_name,
|
|
struct sbuf *sb, int *claimed)
|
|
{
|
|
struct mac_mls *mm;
|
|
|
|
if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
|
|
return (0);
|
|
|
|
(*claimed)++;
|
|
|
|
mm = SLOT(label);
|
|
|
|
return (mls_to_string(sb, mm));
|
|
}
|
|
|
|
static int
|
|
mls_parse_element(struct mac_mls_element *element, char *string)
|
|
{
|
|
char *compartment, *end, *level;
|
|
int value;
|
|
|
|
if (strcmp(string, "high") == 0 || strcmp(string, "hi") == 0) {
|
|
element->mme_type = MAC_MLS_TYPE_HIGH;
|
|
element->mme_level = MAC_MLS_TYPE_UNDEF;
|
|
} else if (strcmp(string, "low") == 0 || strcmp(string, "lo") == 0) {
|
|
element->mme_type = MAC_MLS_TYPE_LOW;
|
|
element->mme_level = MAC_MLS_TYPE_UNDEF;
|
|
} else if (strcmp(string, "equal") == 0 ||
|
|
strcmp(string, "eq") == 0) {
|
|
element->mme_type = MAC_MLS_TYPE_EQUAL;
|
|
element->mme_level = MAC_MLS_TYPE_UNDEF;
|
|
} else {
|
|
element->mme_type = MAC_MLS_TYPE_LEVEL;
|
|
|
|
/*
|
|
* Numeric level piece of the element.
|
|
*/
|
|
level = strsep(&string, ":");
|
|
value = strtol(level, &end, 10);
|
|
if (end == level || *end != '\0')
|
|
return (EINVAL);
|
|
if (value < 0 || value > 65535)
|
|
return (EINVAL);
|
|
element->mme_level = value;
|
|
|
|
/*
|
|
* Optional compartment piece of the element. If none are
|
|
* included, we assume that the label has no compartments.
|
|
*/
|
|
if (string == NULL)
|
|
return (0);
|
|
if (*string == '\0')
|
|
return (0);
|
|
|
|
while ((compartment = strsep(&string, "+")) != NULL) {
|
|
value = strtol(compartment, &end, 10);
|
|
if (compartment == end || *end != '\0')
|
|
return (EINVAL);
|
|
if (value < 1 || value > MAC_MLS_MAX_COMPARTMENTS)
|
|
return (EINVAL);
|
|
MAC_MLS_BIT_SET(value, element->mme_compartments);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Note: destructively consumes the string, make a local copy before calling
|
|
* if that's a problem.
|
|
*/
|
|
static int
|
|
mls_parse(struct mac_mls *mm, char *string)
|
|
{
|
|
char *rangehigh, *rangelow, *effective;
|
|
int error;
|
|
|
|
effective = strsep(&string, "(");
|
|
if (*effective == '\0')
|
|
effective = NULL;
|
|
|
|
if (string != NULL) {
|
|
rangelow = strsep(&string, "-");
|
|
if (string == NULL)
|
|
return (EINVAL);
|
|
rangehigh = strsep(&string, ")");
|
|
if (string == NULL)
|
|
return (EINVAL);
|
|
if (*string != '\0')
|
|
return (EINVAL);
|
|
} else {
|
|
rangelow = NULL;
|
|
rangehigh = NULL;
|
|
}
|
|
|
|
KASSERT((rangelow != NULL && rangehigh != NULL) ||
|
|
(rangelow == NULL && rangehigh == NULL),
|
|
("mls_parse: range mismatch"));
|
|
|
|
bzero(mm, sizeof(*mm));
|
|
if (effective != NULL) {
|
|
error = mls_parse_element(&mm->mm_effective, effective);
|
|
if (error)
|
|
return (error);
|
|
mm->mm_flags |= MAC_MLS_FLAG_EFFECTIVE;
|
|
}
|
|
|
|
if (rangelow != NULL) {
|
|
error = mls_parse_element(&mm->mm_rangelow, rangelow);
|
|
if (error)
|
|
return (error);
|
|
error = mls_parse_element(&mm->mm_rangehigh, rangehigh);
|
|
if (error)
|
|
return (error);
|
|
mm->mm_flags |= MAC_MLS_FLAG_RANGE;
|
|
}
|
|
|
|
error = mls_valid(mm);
|
|
if (error)
|
|
return (error);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_internalize_label(struct label *label, char *element_name,
|
|
char *element_data, int *claimed)
|
|
{
|
|
struct mac_mls *mm, mm_temp;
|
|
int error;
|
|
|
|
if (strcmp(MAC_MLS_LABEL_NAME, element_name) != 0)
|
|
return (0);
|
|
|
|
(*claimed)++;
|
|
|
|
error = mls_parse(&mm_temp, element_data);
|
|
if (error)
|
|
return (error);
|
|
|
|
mm = SLOT(label);
|
|
*mm = mm_temp;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_copy_label(struct label *src, struct label *dest)
|
|
{
|
|
|
|
*SLOT(dest) = *SLOT(src);
|
|
}
|
|
|
|
/*
|
|
* Object-specific entry point implementations are sorted alphabetically by
|
|
* object type name and then by operation.
|
|
*/
|
|
static int
|
|
mls_bpfdesc_check_receive(struct bpf_d *d, struct label *dlabel,
|
|
struct ifnet *ifp, struct label *ifplabel)
|
|
{
|
|
struct mac_mls *a, *b;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
a = SLOT(dlabel);
|
|
b = SLOT(ifplabel);
|
|
|
|
if (mls_equal_effective(a, b))
|
|
return (0);
|
|
return (EACCES);
|
|
}
|
|
|
|
static void
|
|
mls_bpfdesc_create(struct ucred *cred, struct bpf_d *d, struct label *dlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(dlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_bpfdesc_create_mbuf(struct bpf_d *d, struct label *dlabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(dlabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_cred_associate_nfsd(struct ucred *cred)
|
|
{
|
|
struct mac_mls *label;
|
|
|
|
label = SLOT(cred->cr_label);
|
|
mls_set_effective(label, MAC_MLS_TYPE_LOW, 0, NULL);
|
|
mls_set_range(label, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
|
|
NULL);
|
|
}
|
|
|
|
static int
|
|
mls_cred_check_relabel(struct ucred *cred, struct label *newlabel)
|
|
{
|
|
struct mac_mls *subj, *new;
|
|
int error;
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
new = SLOT(newlabel);
|
|
|
|
/*
|
|
* If there is an MLS label update for the credential, it may be an
|
|
* update of effective, range, or both.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAGS_BOTH) {
|
|
/*
|
|
* If the change request modifies both the MLS label
|
|
* effective and range, check that the new effective will be
|
|
* in the new range.
|
|
*/
|
|
if ((new->mm_flags & MAC_MLS_FLAGS_BOTH) ==
|
|
MAC_MLS_FLAGS_BOTH && !mls_effective_in_range(new, new))
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* To change the MLS effective label on a credential, the new
|
|
* effective label must be in the current range.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE &&
|
|
!mls_effective_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the MLS range label on a credential, the new
|
|
* range must be in the current range.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_RANGE &&
|
|
!mls_range_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To have EQUAL in any component of the new credential MLS
|
|
* label, the subject must already have EQUAL in their label.
|
|
*/
|
|
if (mls_contains_equal(new)) {
|
|
error = mls_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_cred_check_visible(struct ucred *cr1, struct ucred *cr2)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cr1->cr_label);
|
|
obj = SLOT(cr2->cr_label);
|
|
|
|
/* XXX: range */
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (ESRCH);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_cred_create_init(struct ucred *cred)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(cred->cr_label);
|
|
|
|
mls_set_effective(dest, MAC_MLS_TYPE_LOW, 0, NULL);
|
|
mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
|
|
NULL);
|
|
}
|
|
|
|
static void
|
|
mls_cred_create_swapper(struct ucred *cred)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(cred->cr_label);
|
|
|
|
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
|
|
mls_set_range(dest, MAC_MLS_TYPE_LOW, 0, NULL, MAC_MLS_TYPE_HIGH, 0,
|
|
NULL);
|
|
}
|
|
|
|
static void
|
|
mls_cred_relabel(struct ucred *cred, struct label *newlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(cred->cr_label);
|
|
|
|
mls_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_devfs_create_device(struct ucred *cred, struct mount *mp,
|
|
struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
|
|
{
|
|
struct mac_mls *mm;
|
|
const char *dn;
|
|
int mls_type;
|
|
|
|
mm = SLOT(delabel);
|
|
dn = devtoname(dev);
|
|
if (strcmp(dn, "null") == 0 ||
|
|
strcmp(dn, "zero") == 0 ||
|
|
strcmp(dn, "random") == 0 ||
|
|
strncmp(dn, "fd/", strlen("fd/")) == 0)
|
|
mls_type = MAC_MLS_TYPE_EQUAL;
|
|
else if (strcmp(dn, "kmem") == 0 ||
|
|
strcmp(dn, "mem") == 0)
|
|
mls_type = MAC_MLS_TYPE_HIGH;
|
|
else if (ptys_equal &&
|
|
(strncmp(dn, "ttyp", strlen("ttyp")) == 0 ||
|
|
strncmp(dn, "pts/", strlen("pts/")) == 0 ||
|
|
strncmp(dn, "ptyp", strlen("ptyp")) == 0))
|
|
mls_type = MAC_MLS_TYPE_EQUAL;
|
|
else
|
|
mls_type = MAC_MLS_TYPE_LOW;
|
|
mls_set_effective(mm, mls_type, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mls_devfs_create_directory(struct mount *mp, char *dirname, int dirnamelen,
|
|
struct devfs_dirent *de, struct label *delabel)
|
|
{
|
|
struct mac_mls *mm;
|
|
|
|
mm = SLOT(delabel);
|
|
mls_set_effective(mm, MAC_MLS_TYPE_LOW, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mls_devfs_create_symlink(struct ucred *cred, struct mount *mp,
|
|
struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
|
|
struct label *delabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(delabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_devfs_update(struct mount *mp, struct devfs_dirent *de,
|
|
struct label *delabel, struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(vplabel);
|
|
dest = SLOT(delabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_devfs_vnode_associate(struct mount *mp, struct label *mplabel,
|
|
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(delabel);
|
|
dest = SLOT(vplabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_ifnet_check_relabel(struct ucred *cred, struct ifnet *ifp,
|
|
struct label *ifplabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *subj, *new;
|
|
int error;
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
new = SLOT(newlabel);
|
|
|
|
/*
|
|
* If there is an MLS label update for the interface, it may be an
|
|
* update of effective, range, or both.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAGS_BOTH);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Relabeling network interfaces requires MLS privilege.
|
|
*/
|
|
return (mls_subject_privileged(subj));
|
|
}
|
|
|
|
static int
|
|
mls_ifnet_check_transmit(struct ifnet *ifp, struct label *ifplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *p, *i;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
p = SLOT(mlabel);
|
|
i = SLOT(ifplabel);
|
|
|
|
return (mls_effective_in_range(p, i) ? 0 : EACCES);
|
|
}
|
|
|
|
static void
|
|
mls_ifnet_create(struct ifnet *ifp, struct label *ifplabel)
|
|
{
|
|
struct mac_mls *dest;
|
|
int type;
|
|
|
|
dest = SLOT(ifplabel);
|
|
|
|
if (ifp->if_type == IFT_LOOP)
|
|
type = MAC_MLS_TYPE_EQUAL;
|
|
else
|
|
type = MAC_MLS_TYPE_LOW;
|
|
|
|
mls_set_effective(dest, type, 0, NULL);
|
|
mls_set_range(dest, type, 0, NULL, type, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mls_ifnet_create_mbuf(struct ifnet *ifp, struct label *ifplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(ifplabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
|
|
struct label *ifplabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(ifplabel);
|
|
|
|
mls_copy(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_inpcb_check_deliver(struct inpcb *inp, struct label *inplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *p, *i;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
p = SLOT(mlabel);
|
|
i = SLOT(inplabel);
|
|
|
|
return (mls_equal_effective(p, i) ? 0 : EACCES);
|
|
}
|
|
|
|
static int
|
|
mls_inpcb_check_visible(struct ucred *cred, struct inpcb *inp,
|
|
struct label *inplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(inplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (ENOENT);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_inpcb_create(struct socket *so, struct label *solabel, struct inpcb *inp,
|
|
struct label *inplabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(solabel);
|
|
dest = SLOT(inplabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_inpcb_create_mbuf(struct inpcb *inp, struct label *inplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(inplabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_inpcb_sosetlabel(struct socket *so, struct label *solabel,
|
|
struct inpcb *inp, struct label *inplabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
SOCK_LOCK_ASSERT(so);
|
|
|
|
source = SLOT(solabel);
|
|
dest = SLOT(inplabel);
|
|
|
|
mls_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_ip6q_create(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
|
|
struct label *q6label)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(q6label);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_ip6q_match(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
|
|
struct label *q6label)
|
|
{
|
|
struct mac_mls *a, *b;
|
|
|
|
a = SLOT(q6label);
|
|
b = SLOT(mlabel);
|
|
|
|
return (mls_equal_effective(a, b));
|
|
}
|
|
|
|
static void
|
|
mls_ip6q_reassemble(struct ip6q *q6, struct label *q6label, struct mbuf *m,
|
|
struct label *mlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(q6label);
|
|
dest = SLOT(mlabel);
|
|
|
|
/* Just use the head, since we require them all to match. */
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_ip6q_update(struct mbuf *m, struct label *mlabel, struct ip6q *q6,
|
|
struct label *q6label)
|
|
{
|
|
|
|
/* NOOP: we only accept matching labels, so no need to update */
|
|
}
|
|
|
|
static void
|
|
mls_ipq_create(struct mbuf *m, struct label *mlabel, struct ipq *q,
|
|
struct label *qlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(qlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_ipq_match(struct mbuf *m, struct label *mlabel, struct ipq *q,
|
|
struct label *qlabel)
|
|
{
|
|
struct mac_mls *a, *b;
|
|
|
|
a = SLOT(qlabel);
|
|
b = SLOT(mlabel);
|
|
|
|
return (mls_equal_effective(a, b));
|
|
}
|
|
|
|
static void
|
|
mls_ipq_reassemble(struct ipq *q, struct label *qlabel, struct mbuf *m,
|
|
struct label *mlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(qlabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
/* Just use the head, since we require them all to match. */
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_ipq_update(struct mbuf *m, struct label *mlabel, struct ipq *q,
|
|
struct label *qlabel)
|
|
{
|
|
|
|
/* NOOP: we only accept matching labels, so no need to update */
|
|
}
|
|
|
|
static int
|
|
mls_mount_check_stat(struct ucred *cred, struct mount *mp,
|
|
struct label *mntlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(mntlabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_mount_create(struct ucred *cred, struct mount *mp, struct label *mplabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(mplabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_netinet_arp_send(struct ifnet *ifp, struct label *ifplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(mlabel);
|
|
|
|
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mls_netinet_firewall_reply(struct mbuf *mrecv, struct label *mrecvlabel,
|
|
struct mbuf *msend, struct label *msendlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(mrecvlabel);
|
|
dest = SLOT(msendlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_netinet_firewall_send(struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(mlabel);
|
|
|
|
/* XXX: where is the label for the firewall really coming from? */
|
|
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mls_netinet_fragment(struct mbuf *m, struct label *mlabel, struct mbuf *frag,
|
|
struct label *fraglabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(fraglabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_netinet_icmp_reply(struct mbuf *mrecv, struct label *mrecvlabel,
|
|
struct mbuf *msend, struct label *msendlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(mrecvlabel);
|
|
dest = SLOT(msendlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_netinet_igmp_send(struct ifnet *ifp, struct label *ifplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(mlabel);
|
|
|
|
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
|
|
}
|
|
|
|
static void
|
|
mls_netinet6_nd6_send(struct ifnet *ifp, struct label *ifplabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *dest;
|
|
|
|
dest = SLOT(mlabel);
|
|
|
|
mls_set_effective(dest, MAC_MLS_TYPE_EQUAL, 0, NULL);
|
|
}
|
|
|
|
static int
|
|
mls_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
|
|
{
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
/* XXX: This will be implemented soon... */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_pipe_check_poll(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(pplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_pipe_check_read(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(pplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *subj, *obj, *new;
|
|
int error;
|
|
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(pplabel);
|
|
|
|
/*
|
|
* If there is an MLS label update for a pipe, it must be a effective
|
|
* update.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To perform a relabel of a pipe (MLS label or not), MLS must
|
|
* authorize the relabel.
|
|
*/
|
|
if (!mls_effective_in_range(obj, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
|
|
/*
|
|
* To change the MLS label on a pipe, the new pipe label must
|
|
* be in the subject range.
|
|
*/
|
|
if (!mls_effective_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the MLS label on a pipe to be EQUAL, the subject
|
|
* must have appropriate privilege.
|
|
*/
|
|
if (mls_contains_equal(new)) {
|
|
error = mls_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_pipe_check_stat(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(pplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_pipe_check_write(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(pplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_pipe_create(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(pplabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_pipe_relabel(struct ucred *cred, struct pipepair *pp,
|
|
struct label *pplabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(pplabel);
|
|
|
|
mls_copy(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_posixsem_check_openunlink(struct ucred *cred, struct ksem *ks,
|
|
struct label *kslabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(kslabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixsem_check_rdonly(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct ksem *ks, struct label *kslabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(kslabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixsem_check_setmode(struct ucred *cred, struct ksem *ks,
|
|
struct label *shmlabel, mode_t mode)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixsem_check_setowner(struct ucred *cred, struct ksem *ks,
|
|
struct label *shmlabel, uid_t uid, gid_t gid)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixsem_check_write(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct ksem *ks, struct label *kslabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(kslabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_posixsem_create(struct ucred *cred, struct ksem *ks,
|
|
struct label *kslabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(kslabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_mmap(struct ucred *cred, struct shmfd *shmfd,
|
|
struct label *shmlabel, int prot, int flags)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_open(struct ucred *cred, struct shmfd *shmfd,
|
|
struct label *shmlabel, accmode_t accmode)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
if (accmode & VMODIFY_PERMS) {
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_read(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct shmfd *shm, struct label *shmlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_setmode(struct ucred *cred, struct shmfd *shmfd,
|
|
struct label *shmlabel, mode_t mode)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_setowner(struct ucred *cred, struct shmfd *shmfd,
|
|
struct label *shmlabel, uid_t uid, gid_t gid)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_stat(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct shmfd *shmfd, struct label *shmlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_truncate(struct ucred *active_cred,
|
|
struct ucred *file_cred, struct shmfd *shmfd, struct label *shmlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_unlink(struct ucred *cred, struct shmfd *shmfd,
|
|
struct label *shmlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_posixshm_check_write(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct shmfd *shm, struct label *shmlabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(shmlabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_posixshm_create(struct ucred *cred, struct shmfd *shmfd,
|
|
struct label *shmlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(shmlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_proc_check_debug(struct ucred *cred, struct proc *p)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(p->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (ESRCH);
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_proc_check_sched(struct ucred *cred, struct proc *p)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(p->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (ESRCH);
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_proc_check_signal(struct ucred *cred, struct proc *p, int signum)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(p->p_ucred->cr_label);
|
|
|
|
/* XXX: range checks */
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (ESRCH);
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_socket_check_deliver(struct socket *so, struct label *solabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *p, *s;
|
|
int error;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
p = SLOT(mlabel);
|
|
s = SLOT(solabel);
|
|
|
|
SOCK_LOCK(so);
|
|
error = mls_equal_effective(p, s) ? 0 : EACCES;
|
|
SOCK_UNLOCK(so);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
mls_socket_check_relabel(struct ucred *cred, struct socket *so,
|
|
struct label *solabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *subj, *obj, *new;
|
|
int error;
|
|
|
|
SOCK_LOCK_ASSERT(so);
|
|
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(solabel);
|
|
|
|
/*
|
|
* If there is an MLS label update for the socket, it may be an
|
|
* update of effective.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To relabel a socket, the old socket effective must be in the
|
|
* subject range.
|
|
*/
|
|
if (!mls_effective_in_range(obj, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
|
|
/*
|
|
* To relabel a socket, the new socket effective must be in
|
|
* the subject range.
|
|
*/
|
|
if (!mls_effective_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the MLS label on the socket to contain EQUAL,
|
|
* the subject must have appropriate privilege.
|
|
*/
|
|
if (mls_contains_equal(new)) {
|
|
error = mls_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_socket_check_visible(struct ucred *cred, struct socket *so,
|
|
struct label *solabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(solabel);
|
|
|
|
SOCK_LOCK(so);
|
|
if (!mls_dominate_effective(subj, obj)) {
|
|
SOCK_UNLOCK(so);
|
|
return (ENOENT);
|
|
}
|
|
SOCK_UNLOCK(so);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_socket_create(struct ucred *cred, struct socket *so,
|
|
struct label *solabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(solabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_socket_create_mbuf(struct socket *so, struct label *solabel,
|
|
struct mbuf *m, struct label *mlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(solabel);
|
|
dest = SLOT(mlabel);
|
|
|
|
SOCK_LOCK(so);
|
|
mls_copy_effective(source, dest);
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
|
|
static void
|
|
mls_socket_newconn(struct socket *oldso, struct label *oldsolabel,
|
|
struct socket *newso, struct label *newsolabel)
|
|
{
|
|
struct mac_mls source, *dest;
|
|
|
|
SOCK_LOCK(oldso);
|
|
source = *SLOT(oldsolabel);
|
|
SOCK_UNLOCK(oldso);
|
|
|
|
dest = SLOT(newsolabel);
|
|
|
|
SOCK_LOCK(newso);
|
|
mls_copy_effective(&source, dest);
|
|
SOCK_UNLOCK(newso);
|
|
}
|
|
|
|
static void
|
|
mls_socket_relabel(struct ucred *cred, struct socket *so,
|
|
struct label *solabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
SOCK_LOCK_ASSERT(so);
|
|
|
|
source = SLOT(newlabel);
|
|
dest = SLOT(solabel);
|
|
|
|
mls_copy(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_socketpeer_set_from_mbuf(struct mbuf *m, struct label *mlabel,
|
|
struct socket *so, struct label *sopeerlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(mlabel);
|
|
dest = SLOT(sopeerlabel);
|
|
|
|
SOCK_LOCK(so);
|
|
mls_copy_effective(source, dest);
|
|
SOCK_UNLOCK(so);
|
|
}
|
|
|
|
static void
|
|
mls_socketpeer_set_from_socket(struct socket *oldso,
|
|
struct label *oldsolabel, struct socket *newso,
|
|
struct label *newsopeerlabel)
|
|
{
|
|
struct mac_mls source, *dest;
|
|
|
|
SOCK_LOCK(oldso);
|
|
source = *SLOT(oldsolabel);
|
|
SOCK_UNLOCK(oldso);
|
|
|
|
dest = SLOT(newsopeerlabel);
|
|
|
|
SOCK_LOCK(newso);
|
|
mls_copy_effective(&source, dest);
|
|
SOCK_UNLOCK(newso);
|
|
}
|
|
|
|
static void
|
|
mls_syncache_create(struct label *label, struct inpcb *inp)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(inp->inp_label);
|
|
dest = SLOT(label);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static void
|
|
mls_syncache_create_mbuf(struct label *sc_label, struct mbuf *m,
|
|
struct label *mlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(sc_label);
|
|
dest = SLOT(mlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_system_check_acct(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
if (vplabel == NULL)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj) ||
|
|
!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_system_check_auditctl(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj) ||
|
|
!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_system_check_swapon(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj) ||
|
|
!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_sysvmsg_cleanup(struct label *msglabel)
|
|
{
|
|
|
|
bzero(SLOT(msglabel), sizeof(struct mac_mls));
|
|
}
|
|
|
|
static void
|
|
mls_sysvmsg_create(struct ucred *cred, struct msqid_kernel *msqkptr,
|
|
struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
/* Ignore the msgq label. */
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(msglabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_sysvmsq_check_msgrcv(struct ucred *cred, struct msg *msgptr,
|
|
struct label *msglabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(msglabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvmsq_check_msgrmid(struct ucred *cred, struct msg *msgptr,
|
|
struct label *msglabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(msglabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvmsq_check_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
|
|
struct label *msqklabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(msqklabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvmsq_check_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
|
|
struct label *msqklabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(msqklabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvmsq_check_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
|
|
struct label *msqklabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(msqklabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvmsq_check_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
|
|
struct label *msqklabel, int cmd)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(msqklabel);
|
|
|
|
switch(cmd) {
|
|
case IPC_RMID:
|
|
case IPC_SET:
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
break;
|
|
|
|
case IPC_STAT:
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
break;
|
|
|
|
default:
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_sysvmsq_cleanup(struct label *msqlabel)
|
|
{
|
|
|
|
bzero(SLOT(msqlabel), sizeof(struct mac_mls));
|
|
}
|
|
|
|
static void
|
|
mls_sysvmsq_create(struct ucred *cred, struct msqid_kernel *msqkptr,
|
|
struct label *msqlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(msqlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_sysvsem_check_semctl(struct ucred *cred, struct semid_kernel *semakptr,
|
|
struct label *semaklabel, int cmd)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(semaklabel);
|
|
|
|
switch(cmd) {
|
|
case IPC_RMID:
|
|
case IPC_SET:
|
|
case SETVAL:
|
|
case SETALL:
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
break;
|
|
|
|
case IPC_STAT:
|
|
case GETVAL:
|
|
case GETPID:
|
|
case GETNCNT:
|
|
case GETZCNT:
|
|
case GETALL:
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
break;
|
|
|
|
default:
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvsem_check_semget(struct ucred *cred, struct semid_kernel *semakptr,
|
|
struct label *semaklabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(semaklabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvsem_check_semop(struct ucred *cred, struct semid_kernel *semakptr,
|
|
struct label *semaklabel, size_t accesstype)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(semaklabel);
|
|
|
|
if( accesstype & SEM_R )
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
if( accesstype & SEM_A )
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_sysvsem_cleanup(struct label *semalabel)
|
|
{
|
|
|
|
bzero(SLOT(semalabel), sizeof(struct mac_mls));
|
|
}
|
|
|
|
static void
|
|
mls_sysvsem_create(struct ucred *cred, struct semid_kernel *semakptr,
|
|
struct label *semalabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(semalabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
|
|
struct label *shmseglabel, int shmflg)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmseglabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
if ((shmflg & SHM_RDONLY) == 0) {
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
|
|
struct label *shmseglabel, int cmd)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmseglabel);
|
|
|
|
switch(cmd) {
|
|
case IPC_RMID:
|
|
case IPC_SET:
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
break;
|
|
|
|
case IPC_STAT:
|
|
case SHM_STAT:
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
break;
|
|
|
|
default:
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
|
|
struct label *shmseglabel, int shmflg)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(shmseglabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_sysvshm_cleanup(struct label *shmlabel)
|
|
{
|
|
|
|
bzero(SLOT(shmlabel), sizeof(struct mac_mls));
|
|
}
|
|
|
|
static void
|
|
mls_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr,
|
|
struct label *shmlabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(shmlabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_associate_extattr(struct mount *mp, struct label *mplabel,
|
|
struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_mls mm_temp, *source, *dest;
|
|
int buflen, error;
|
|
|
|
source = SLOT(mplabel);
|
|
dest = SLOT(vplabel);
|
|
|
|
buflen = sizeof(mm_temp);
|
|
bzero(&mm_temp, buflen);
|
|
|
|
error = vn_extattr_get(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
|
|
MAC_MLS_EXTATTR_NAME, &buflen, (char *) &mm_temp, curthread);
|
|
if (error == ENOATTR || error == EOPNOTSUPP) {
|
|
/* Fall back to the mntlabel. */
|
|
mls_copy_effective(source, dest);
|
|
return (0);
|
|
} else if (error)
|
|
return (error);
|
|
|
|
if (buflen != sizeof(mm_temp)) {
|
|
printf("mls_vnode_associate_extattr: bad size %d\n", buflen);
|
|
return (EPERM);
|
|
}
|
|
if (mls_valid(&mm_temp) != 0) {
|
|
printf("mls_vnode_associate_extattr: invalid\n");
|
|
return (EPERM);
|
|
}
|
|
if ((mm_temp.mm_flags & MAC_MLS_FLAGS_BOTH) !=
|
|
MAC_MLS_FLAG_EFFECTIVE) {
|
|
printf("mls_associated_vnode_extattr: not effective\n");
|
|
return (EPERM);
|
|
}
|
|
|
|
mls_copy_effective(&mm_temp, dest);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
mls_vnode_associate_singlelabel(struct mount *mp, struct label *mplabel,
|
|
struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(mplabel);
|
|
dest = SLOT(vplabel);
|
|
|
|
mls_copy_effective(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_chdir(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_chroot(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_create(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_deleteacl(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, acl_type_t type)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_deleteextattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, int attrnamespace, const char *name)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_exec(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct image_params *imgp,
|
|
struct label *execlabel)
|
|
{
|
|
struct mac_mls *subj, *obj, *exec;
|
|
int error;
|
|
|
|
if (execlabel != NULL) {
|
|
/*
|
|
* We currently don't permit labels to be changed at
|
|
* exec-time as part of MLS, so disallow non-NULL MLS label
|
|
* elements in the execlabel.
|
|
*/
|
|
exec = SLOT(execlabel);
|
|
error = mls_atmostflags(exec, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_getacl(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, acl_type_t type)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_getextattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, int attrnamespace, const char *name)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_link(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(vplabel);
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_listextattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, int attrnamespace)
|
|
{
|
|
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_lookup(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_mmap(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, int prot, int flags)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
/*
|
|
* Rely on the use of open()-time protections to handle
|
|
* non-revocation cases.
|
|
*/
|
|
if (!mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_open(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, accmode_t accmode)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
/* XXX privilege override for admin? */
|
|
if (accmode & (VREAD | VEXEC | VSTAT_PERMS)) {
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
}
|
|
if (accmode & VMODIFY_PERMS) {
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_poll(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_read(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_readdir(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_readlink(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_relabel(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct label *newlabel)
|
|
{
|
|
struct mac_mls *old, *new, *subj;
|
|
int error;
|
|
|
|
old = SLOT(vplabel);
|
|
new = SLOT(newlabel);
|
|
subj = SLOT(cred->cr_label);
|
|
|
|
/*
|
|
* If there is an MLS label update for the vnode, it must be a
|
|
* effective label.
|
|
*/
|
|
error = mls_atmostflags(new, MAC_MLS_FLAG_EFFECTIVE);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* To perform a relabel of the vnode (MLS label or not), MLS must
|
|
* authorize the relabel.
|
|
*/
|
|
if (!mls_effective_in_range(old, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* If the MLS label is to be changed, authorize as appropriate.
|
|
*/
|
|
if (new->mm_flags & MAC_MLS_FLAG_EFFECTIVE) {
|
|
/*
|
|
* To change the MLS label on a vnode, the new vnode label
|
|
* must be in the subject range.
|
|
*/
|
|
if (!mls_effective_in_range(new, subj))
|
|
return (EPERM);
|
|
|
|
/*
|
|
* To change the MLS label on the vnode to be EQUAL, the
|
|
* subject must have appropriate privilege.
|
|
*/
|
|
if (mls_contains_equal(new)) {
|
|
error = mls_subject_privileged(subj);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_rename_from(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_rename_to(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
|
int samedir, struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
if (vp != NULL) {
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_revoke(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_setacl(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, acl_type_t type, struct acl *acl)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_setextattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, int attrnamespace, const char *name)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
/* XXX: protect the MAC EA in a special way? */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_setflags(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, u_long flags)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_setmode(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, mode_t mode)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_setowner(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, uid_t uid, gid_t gid)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_setutimes(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct timespec atime, struct timespec mtime)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_stat(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(subj, obj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_unlink(struct ucred *cred, struct vnode *dvp,
|
|
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
|
|
struct componentname *cnp)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(cred->cr_label);
|
|
obj = SLOT(dvplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_check_write(struct ucred *active_cred, struct ucred *file_cred,
|
|
struct vnode *vp, struct label *vplabel)
|
|
{
|
|
struct mac_mls *subj, *obj;
|
|
|
|
if (!mls_enabled || !revocation_enabled)
|
|
return (0);
|
|
|
|
subj = SLOT(active_cred->cr_label);
|
|
obj = SLOT(vplabel);
|
|
|
|
if (!mls_dominate_effective(obj, subj))
|
|
return (EACCES);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_create_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_mls *source, *dest, mm_temp;
|
|
size_t buflen;
|
|
int error;
|
|
|
|
buflen = sizeof(mm_temp);
|
|
bzero(&mm_temp, buflen);
|
|
|
|
source = SLOT(cred->cr_label);
|
|
dest = SLOT(vplabel);
|
|
mls_copy_effective(source, &mm_temp);
|
|
|
|
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
|
|
MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread);
|
|
if (error == 0)
|
|
mls_copy_effective(source, dest);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
mls_vnode_relabel(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct label *label)
|
|
{
|
|
struct mac_mls *source, *dest;
|
|
|
|
source = SLOT(label);
|
|
dest = SLOT(vplabel);
|
|
|
|
mls_copy(source, dest);
|
|
}
|
|
|
|
static int
|
|
mls_vnode_setlabel_extattr(struct ucred *cred, struct vnode *vp,
|
|
struct label *vplabel, struct label *intlabel)
|
|
{
|
|
struct mac_mls *source, mm_temp;
|
|
size_t buflen;
|
|
int error;
|
|
|
|
buflen = sizeof(mm_temp);
|
|
bzero(&mm_temp, buflen);
|
|
|
|
source = SLOT(intlabel);
|
|
if ((source->mm_flags & MAC_MLS_FLAG_EFFECTIVE) == 0)
|
|
return (0);
|
|
|
|
mls_copy_effective(source, &mm_temp);
|
|
|
|
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_MLS_EXTATTR_NAMESPACE,
|
|
MAC_MLS_EXTATTR_NAME, buflen, (char *) &mm_temp, curthread);
|
|
return (error);
|
|
}
|
|
|
|
static struct mac_policy_ops mls_ops =
|
|
{
|
|
.mpo_init = mls_init,
|
|
|
|
.mpo_bpfdesc_check_receive = mls_bpfdesc_check_receive,
|
|
.mpo_bpfdesc_create = mls_bpfdesc_create,
|
|
.mpo_bpfdesc_create_mbuf = mls_bpfdesc_create_mbuf,
|
|
.mpo_bpfdesc_destroy_label = mls_destroy_label,
|
|
.mpo_bpfdesc_init_label = mls_init_label,
|
|
|
|
.mpo_cred_associate_nfsd = mls_cred_associate_nfsd,
|
|
.mpo_cred_check_relabel = mls_cred_check_relabel,
|
|
.mpo_cred_check_visible = mls_cred_check_visible,
|
|
.mpo_cred_copy_label = mls_copy_label,
|
|
.mpo_cred_create_init = mls_cred_create_init,
|
|
.mpo_cred_create_swapper = mls_cred_create_swapper,
|
|
.mpo_cred_destroy_label = mls_destroy_label,
|
|
.mpo_cred_externalize_label = mls_externalize_label,
|
|
.mpo_cred_init_label = mls_init_label,
|
|
.mpo_cred_internalize_label = mls_internalize_label,
|
|
.mpo_cred_relabel = mls_cred_relabel,
|
|
|
|
.mpo_devfs_create_device = mls_devfs_create_device,
|
|
.mpo_devfs_create_directory = mls_devfs_create_directory,
|
|
.mpo_devfs_create_symlink = mls_devfs_create_symlink,
|
|
.mpo_devfs_destroy_label = mls_destroy_label,
|
|
.mpo_devfs_init_label = mls_init_label,
|
|
.mpo_devfs_update = mls_devfs_update,
|
|
.mpo_devfs_vnode_associate = mls_devfs_vnode_associate,
|
|
|
|
.mpo_ifnet_check_relabel = mls_ifnet_check_relabel,
|
|
.mpo_ifnet_check_transmit = mls_ifnet_check_transmit,
|
|
.mpo_ifnet_copy_label = mls_copy_label,
|
|
.mpo_ifnet_create = mls_ifnet_create,
|
|
.mpo_ifnet_create_mbuf = mls_ifnet_create_mbuf,
|
|
.mpo_ifnet_destroy_label = mls_destroy_label,
|
|
.mpo_ifnet_externalize_label = mls_externalize_label,
|
|
.mpo_ifnet_init_label = mls_init_label,
|
|
.mpo_ifnet_internalize_label = mls_internalize_label,
|
|
.mpo_ifnet_relabel = mls_ifnet_relabel,
|
|
|
|
.mpo_inpcb_check_deliver = mls_inpcb_check_deliver,
|
|
.mpo_inpcb_check_visible = mls_inpcb_check_visible,
|
|
.mpo_inpcb_create = mls_inpcb_create,
|
|
.mpo_inpcb_create_mbuf = mls_inpcb_create_mbuf,
|
|
.mpo_inpcb_destroy_label = mls_destroy_label,
|
|
.mpo_inpcb_init_label = mls_init_label_waitcheck,
|
|
.mpo_inpcb_sosetlabel = mls_inpcb_sosetlabel,
|
|
|
|
.mpo_ip6q_create = mls_ip6q_create,
|
|
.mpo_ip6q_destroy_label = mls_destroy_label,
|
|
.mpo_ip6q_init_label = mls_init_label_waitcheck,
|
|
.mpo_ip6q_match = mls_ip6q_match,
|
|
.mpo_ip6q_reassemble = mls_ip6q_reassemble,
|
|
.mpo_ip6q_update = mls_ip6q_update,
|
|
|
|
.mpo_ipq_create = mls_ipq_create,
|
|
.mpo_ipq_destroy_label = mls_destroy_label,
|
|
.mpo_ipq_init_label = mls_init_label_waitcheck,
|
|
.mpo_ipq_match = mls_ipq_match,
|
|
.mpo_ipq_reassemble = mls_ipq_reassemble,
|
|
.mpo_ipq_update = mls_ipq_update,
|
|
|
|
.mpo_mbuf_copy_label = mls_copy_label,
|
|
.mpo_mbuf_destroy_label = mls_destroy_label,
|
|
.mpo_mbuf_init_label = mls_init_label_waitcheck,
|
|
|
|
.mpo_mount_check_stat = mls_mount_check_stat,
|
|
.mpo_mount_create = mls_mount_create,
|
|
.mpo_mount_destroy_label = mls_destroy_label,
|
|
.mpo_mount_init_label = mls_init_label,
|
|
|
|
.mpo_netinet_arp_send = mls_netinet_arp_send,
|
|
.mpo_netinet_firewall_reply = mls_netinet_firewall_reply,
|
|
.mpo_netinet_firewall_send = mls_netinet_firewall_send,
|
|
.mpo_netinet_fragment = mls_netinet_fragment,
|
|
.mpo_netinet_icmp_reply = mls_netinet_icmp_reply,
|
|
.mpo_netinet_igmp_send = mls_netinet_igmp_send,
|
|
|
|
.mpo_netinet6_nd6_send = mls_netinet6_nd6_send,
|
|
|
|
.mpo_pipe_check_ioctl = mls_pipe_check_ioctl,
|
|
.mpo_pipe_check_poll = mls_pipe_check_poll,
|
|
.mpo_pipe_check_read = mls_pipe_check_read,
|
|
.mpo_pipe_check_relabel = mls_pipe_check_relabel,
|
|
.mpo_pipe_check_stat = mls_pipe_check_stat,
|
|
.mpo_pipe_check_write = mls_pipe_check_write,
|
|
.mpo_pipe_copy_label = mls_copy_label,
|
|
.mpo_pipe_create = mls_pipe_create,
|
|
.mpo_pipe_destroy_label = mls_destroy_label,
|
|
.mpo_pipe_externalize_label = mls_externalize_label,
|
|
.mpo_pipe_init_label = mls_init_label,
|
|
.mpo_pipe_internalize_label = mls_internalize_label,
|
|
.mpo_pipe_relabel = mls_pipe_relabel,
|
|
|
|
.mpo_posixsem_check_getvalue = mls_posixsem_check_rdonly,
|
|
.mpo_posixsem_check_open = mls_posixsem_check_openunlink,
|
|
.mpo_posixsem_check_post = mls_posixsem_check_write,
|
|
.mpo_posixsem_check_setmode = mls_posixsem_check_setmode,
|
|
.mpo_posixsem_check_setowner = mls_posixsem_check_setowner,
|
|
.mpo_posixsem_check_stat = mls_posixsem_check_rdonly,
|
|
.mpo_posixsem_check_unlink = mls_posixsem_check_openunlink,
|
|
.mpo_posixsem_check_wait = mls_posixsem_check_write,
|
|
.mpo_posixsem_create = mls_posixsem_create,
|
|
.mpo_posixsem_destroy_label = mls_destroy_label,
|
|
.mpo_posixsem_init_label = mls_init_label,
|
|
|
|
.mpo_posixshm_check_mmap = mls_posixshm_check_mmap,
|
|
.mpo_posixshm_check_open = mls_posixshm_check_open,
|
|
.mpo_posixshm_check_read = mls_posixshm_check_read,
|
|
.mpo_posixshm_check_setmode = mls_posixshm_check_setmode,
|
|
.mpo_posixshm_check_setowner = mls_posixshm_check_setowner,
|
|
.mpo_posixshm_check_stat = mls_posixshm_check_stat,
|
|
.mpo_posixshm_check_truncate = mls_posixshm_check_truncate,
|
|
.mpo_posixshm_check_unlink = mls_posixshm_check_unlink,
|
|
.mpo_posixshm_check_write = mls_posixshm_check_write,
|
|
.mpo_posixshm_create = mls_posixshm_create,
|
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.mpo_posixshm_destroy_label = mls_destroy_label,
|
|
.mpo_posixshm_init_label = mls_init_label,
|
|
|
|
.mpo_proc_check_debug = mls_proc_check_debug,
|
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.mpo_proc_check_sched = mls_proc_check_sched,
|
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.mpo_proc_check_signal = mls_proc_check_signal,
|
|
|
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.mpo_socket_check_deliver = mls_socket_check_deliver,
|
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.mpo_socket_check_relabel = mls_socket_check_relabel,
|
|
.mpo_socket_check_visible = mls_socket_check_visible,
|
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.mpo_socket_copy_label = mls_copy_label,
|
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.mpo_socket_create = mls_socket_create,
|
|
.mpo_socket_create_mbuf = mls_socket_create_mbuf,
|
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.mpo_socket_destroy_label = mls_destroy_label,
|
|
.mpo_socket_externalize_label = mls_externalize_label,
|
|
.mpo_socket_init_label = mls_init_label_waitcheck,
|
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.mpo_socket_internalize_label = mls_internalize_label,
|
|
.mpo_socket_newconn = mls_socket_newconn,
|
|
.mpo_socket_relabel = mls_socket_relabel,
|
|
|
|
.mpo_socketpeer_destroy_label = mls_destroy_label,
|
|
.mpo_socketpeer_externalize_label = mls_externalize_label,
|
|
.mpo_socketpeer_init_label = mls_init_label_waitcheck,
|
|
.mpo_socketpeer_set_from_mbuf = mls_socketpeer_set_from_mbuf,
|
|
.mpo_socketpeer_set_from_socket = mls_socketpeer_set_from_socket,
|
|
|
|
.mpo_syncache_create = mls_syncache_create,
|
|
.mpo_syncache_create_mbuf = mls_syncache_create_mbuf,
|
|
.mpo_syncache_destroy_label = mls_destroy_label,
|
|
.mpo_syncache_init_label = mls_init_label_waitcheck,
|
|
|
|
.mpo_sysvmsg_cleanup = mls_sysvmsg_cleanup,
|
|
.mpo_sysvmsg_create = mls_sysvmsg_create,
|
|
.mpo_sysvmsg_destroy_label = mls_destroy_label,
|
|
.mpo_sysvmsg_init_label = mls_init_label,
|
|
|
|
.mpo_sysvmsq_check_msgrcv = mls_sysvmsq_check_msgrcv,
|
|
.mpo_sysvmsq_check_msgrmid = mls_sysvmsq_check_msgrmid,
|
|
.mpo_sysvmsq_check_msqget = mls_sysvmsq_check_msqget,
|
|
.mpo_sysvmsq_check_msqsnd = mls_sysvmsq_check_msqsnd,
|
|
.mpo_sysvmsq_check_msqrcv = mls_sysvmsq_check_msqrcv,
|
|
.mpo_sysvmsq_check_msqctl = mls_sysvmsq_check_msqctl,
|
|
.mpo_sysvmsq_cleanup = mls_sysvmsq_cleanup,
|
|
.mpo_sysvmsq_destroy_label = mls_destroy_label,
|
|
.mpo_sysvmsq_init_label = mls_init_label,
|
|
.mpo_sysvmsq_create = mls_sysvmsq_create,
|
|
|
|
.mpo_sysvsem_check_semctl = mls_sysvsem_check_semctl,
|
|
.mpo_sysvsem_check_semget = mls_sysvsem_check_semget,
|
|
.mpo_sysvsem_check_semop = mls_sysvsem_check_semop,
|
|
.mpo_sysvsem_cleanup = mls_sysvsem_cleanup,
|
|
.mpo_sysvsem_create = mls_sysvsem_create,
|
|
.mpo_sysvsem_destroy_label = mls_destroy_label,
|
|
.mpo_sysvsem_init_label = mls_init_label,
|
|
|
|
.mpo_sysvshm_check_shmat = mls_sysvshm_check_shmat,
|
|
.mpo_sysvshm_check_shmctl = mls_sysvshm_check_shmctl,
|
|
.mpo_sysvshm_check_shmget = mls_sysvshm_check_shmget,
|
|
.mpo_sysvshm_cleanup = mls_sysvshm_cleanup,
|
|
.mpo_sysvshm_create = mls_sysvshm_create,
|
|
.mpo_sysvshm_destroy_label = mls_destroy_label,
|
|
.mpo_sysvshm_init_label = mls_init_label,
|
|
|
|
.mpo_system_check_acct = mls_system_check_acct,
|
|
.mpo_system_check_auditctl = mls_system_check_auditctl,
|
|
.mpo_system_check_swapon = mls_system_check_swapon,
|
|
|
|
.mpo_vnode_associate_extattr = mls_vnode_associate_extattr,
|
|
.mpo_vnode_associate_singlelabel = mls_vnode_associate_singlelabel,
|
|
.mpo_vnode_check_access = mls_vnode_check_open,
|
|
.mpo_vnode_check_chdir = mls_vnode_check_chdir,
|
|
.mpo_vnode_check_chroot = mls_vnode_check_chroot,
|
|
.mpo_vnode_check_create = mls_vnode_check_create,
|
|
.mpo_vnode_check_deleteacl = mls_vnode_check_deleteacl,
|
|
.mpo_vnode_check_deleteextattr = mls_vnode_check_deleteextattr,
|
|
.mpo_vnode_check_exec = mls_vnode_check_exec,
|
|
.mpo_vnode_check_getacl = mls_vnode_check_getacl,
|
|
.mpo_vnode_check_getextattr = mls_vnode_check_getextattr,
|
|
.mpo_vnode_check_link = mls_vnode_check_link,
|
|
.mpo_vnode_check_listextattr = mls_vnode_check_listextattr,
|
|
.mpo_vnode_check_lookup = mls_vnode_check_lookup,
|
|
.mpo_vnode_check_mmap = mls_vnode_check_mmap,
|
|
.mpo_vnode_check_open = mls_vnode_check_open,
|
|
.mpo_vnode_check_poll = mls_vnode_check_poll,
|
|
.mpo_vnode_check_read = mls_vnode_check_read,
|
|
.mpo_vnode_check_readdir = mls_vnode_check_readdir,
|
|
.mpo_vnode_check_readlink = mls_vnode_check_readlink,
|
|
.mpo_vnode_check_relabel = mls_vnode_check_relabel,
|
|
.mpo_vnode_check_rename_from = mls_vnode_check_rename_from,
|
|
.mpo_vnode_check_rename_to = mls_vnode_check_rename_to,
|
|
.mpo_vnode_check_revoke = mls_vnode_check_revoke,
|
|
.mpo_vnode_check_setacl = mls_vnode_check_setacl,
|
|
.mpo_vnode_check_setextattr = mls_vnode_check_setextattr,
|
|
.mpo_vnode_check_setflags = mls_vnode_check_setflags,
|
|
.mpo_vnode_check_setmode = mls_vnode_check_setmode,
|
|
.mpo_vnode_check_setowner = mls_vnode_check_setowner,
|
|
.mpo_vnode_check_setutimes = mls_vnode_check_setutimes,
|
|
.mpo_vnode_check_stat = mls_vnode_check_stat,
|
|
.mpo_vnode_check_unlink = mls_vnode_check_unlink,
|
|
.mpo_vnode_check_write = mls_vnode_check_write,
|
|
.mpo_vnode_copy_label = mls_copy_label,
|
|
.mpo_vnode_create_extattr = mls_vnode_create_extattr,
|
|
.mpo_vnode_destroy_label = mls_destroy_label,
|
|
.mpo_vnode_externalize_label = mls_externalize_label,
|
|
.mpo_vnode_init_label = mls_init_label,
|
|
.mpo_vnode_internalize_label = mls_internalize_label,
|
|
.mpo_vnode_relabel = mls_vnode_relabel,
|
|
.mpo_vnode_setlabel_extattr = mls_vnode_setlabel_extattr,
|
|
};
|
|
|
|
MAC_POLICY_SET(&mls_ops, mac_mls, "TrustedBSD MAC/MLS",
|
|
MPC_LOADTIME_FLAG_NOTLATE, &mls_slot);
|