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fe09513e7d
freebsd-skq/sys/security/mac_biba/mac_biba.c
Robert Watson fe09513e7d Canonicalize naming of local variables for struct ksem and associated 
labels to 'ks' and 'kslabel' to reflect the convention in posix_sem.c.

MFC after:	3 days
Obtained from:	TrustedBSD Project
2007-10-21 11:11:07 +00:00

3426 lines
79 KiB
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/*-
* Copyright (c) 1999-2002, 2007 Robert N. M. Watson
* Copyright (c) 2001-2005 McAfee, Inc.
* All rights reserved.
*
* This software was developed by Robert Watson for the TrustedBSD Project.
*
* This software was developed for the FreeBSD Project in part by McAfee
* Research, the Security Research Division of McAfee, Inc. under
* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
* CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Developed by the TrustedBSD Project.
*
* Biba fixed label mandatory integrity policy.
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/extattr.h>
#include <sys/kernel.h>
#include <sys/ksem.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/pipe.h>
#include <sys/sx.h>
#include <sys/sysctl.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <fs/devfs/devfs.h>
#include <net/bpfdesc.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <vm/uma.h>
#include <vm/vm.h>
#include <security/mac/mac_policy.h>
#include <security/mac_biba/mac_biba.h>
SYSCTL_DECL(_security_mac);
SYSCTL_NODE(_security_mac, OID_AUTO, biba, CTLFLAG_RW, 0,
"TrustedBSD mac_biba policy controls");
static int mac_biba_label_size = sizeof(struct mac_biba);
SYSCTL_INT(_security_mac_biba, OID_AUTO, label_size, CTLFLAG_RD,
&mac_biba_label_size, 0, "Size of struct mac_biba");
static int mac_biba_enabled = 1;
SYSCTL_INT(_security_mac_biba, OID_AUTO, enabled, CTLFLAG_RW,
&mac_biba_enabled, 0, "Enforce MAC/Biba policy");
TUNABLE_INT("security.mac.biba.enabled", &mac_biba_enabled);
static int destroyed_not_inited;
SYSCTL_INT(_security_mac_biba, OID_AUTO, destroyed_not_inited, CTLFLAG_RD,
&destroyed_not_inited, 0, "Count of labels destroyed but not inited");
static int trust_all_interfaces = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, trust_all_interfaces, CTLFLAG_RD,
&trust_all_interfaces, 0, "Consider all interfaces 'trusted' by MAC/Biba");
TUNABLE_INT("security.mac.biba.trust_all_interfaces", &trust_all_interfaces);
static char trusted_interfaces[128];
SYSCTL_STRING(_security_mac_biba, OID_AUTO, trusted_interfaces, CTLFLAG_RD,
trusted_interfaces, 0, "Interfaces considered 'trusted' by MAC/Biba");
TUNABLE_STR("security.mac.biba.trusted_interfaces", trusted_interfaces,
sizeof(trusted_interfaces));
static int max_compartments = MAC_BIBA_MAX_COMPARTMENTS;
SYSCTL_INT(_security_mac_biba, OID_AUTO, max_compartments, CTLFLAG_RD,
&max_compartments, 0, "Maximum supported compartments");
static int ptys_equal = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, ptys_equal, CTLFLAG_RW,
&ptys_equal, 0, "Label pty devices as biba/equal on create");
TUNABLE_INT("security.mac.biba.ptys_equal", &ptys_equal);
static int interfaces_equal;
SYSCTL_INT(_security_mac_biba, OID_AUTO, interfaces_equal, CTLFLAG_RW,
&interfaces_equal, 0, "Label network interfaces as biba/equal on create");
TUNABLE_INT("security.mac.biba.interfaces_equal", &interfaces_equal);
static int revocation_enabled = 0;
SYSCTL_INT(_security_mac_biba, OID_AUTO, revocation_enabled, CTLFLAG_RW,
&revocation_enabled, 0, "Revoke access to objects on relabel");
TUNABLE_INT("security.mac.biba.revocation_enabled", &revocation_enabled);
static int mac_biba_slot;
#define SLOT(l) ((struct mac_biba *)mac_label_get((l), mac_biba_slot))
#define SLOT_SET(l, val) mac_label_set((l), mac_biba_slot, (uintptr_t)(val))
static uma_zone_t zone_biba;
static __inline int
biba_bit_set_empty(u_char *set) {
int i;
for (i = 0; i < MAC_BIBA_MAX_COMPARTMENTS >> 3; i++)
if (set[i] != 0)
return (0);
return (1);
}
static struct mac_biba *
biba_alloc(int flag)
{
return (uma_zalloc(zone_biba, flag | M_ZERO));
}
static void
biba_free(struct mac_biba *mac_biba)
{
if (mac_biba != NULL)
uma_zfree(zone_biba, mac_biba);
else
atomic_add_int(&destroyed_not_inited, 1);
}
static int
biba_atmostflags(struct mac_biba *mac_biba, int flags)
{
if ((mac_biba->mb_flags & flags) != mac_biba->mb_flags)
return (EINVAL);
return (0);
}
static int
mac_biba_dominate_element(struct mac_biba_element *a,
struct mac_biba_element *b)
{
int bit;
switch (a->mbe_type) {
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
return (1);
case MAC_BIBA_TYPE_LOW:
switch (b->mbe_type) {
case MAC_BIBA_TYPE_GRADE:
case MAC_BIBA_TYPE_HIGH:
return (0);
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_LOW:
return (1);
default:
panic("mac_biba_dominate_element: b->mbe_type invalid");
}
case MAC_BIBA_TYPE_GRADE:
switch (b->mbe_type) {
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_LOW:
return (1);
case MAC_BIBA_TYPE_HIGH:
return (0);
case MAC_BIBA_TYPE_GRADE:
for (bit = 1; bit <= MAC_BIBA_MAX_COMPARTMENTS; bit++)
if (!MAC_BIBA_BIT_TEST(bit,
a->mbe_compartments) &&
MAC_BIBA_BIT_TEST(bit, b->mbe_compartments))
return (0);
return (a->mbe_grade >= b->mbe_grade);
default:
panic("mac_biba_dominate_element: b->mbe_type invalid");
}
default:
panic("mac_biba_dominate_element: a->mbe_type invalid");
}
return (0);
}
static int
mac_biba_subject_dominate_high(struct mac_biba *mac_biba)
{
struct mac_biba_element *element;
KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_effective_in_range: mac_biba not effective"));
element = &mac_biba->mb_effective;
return (element->mbe_type == MAC_BIBA_TYPE_EQUAL ||
element->mbe_type == MAC_BIBA_TYPE_HIGH);
}
static int
mac_biba_range_in_range(struct mac_biba *rangea, struct mac_biba *rangeb)
{
return (mac_biba_dominate_element(&rangeb->mb_rangehigh,
&rangea->mb_rangehigh) &&
mac_biba_dominate_element(&rangea->mb_rangelow,
&rangeb->mb_rangelow));
}
static int
mac_biba_effective_in_range(struct mac_biba *effective,
struct mac_biba *range)
{
KASSERT((effective->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_effective_in_range: a not effective"));
KASSERT((range->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
("mac_biba_effective_in_range: b not range"));
return (mac_biba_dominate_element(&range->mb_rangehigh,
&effective->mb_effective) &&
mac_biba_dominate_element(&effective->mb_effective,
&range->mb_rangelow));
return (1);
}
static int
mac_biba_dominate_effective(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_dominate_effective: a not effective"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_dominate_effective: b not effective"));
return (mac_biba_dominate_element(&a->mb_effective, &b->mb_effective));
}
static int
mac_biba_equal_element(struct mac_biba_element *a, struct mac_biba_element *b)
{
if (a->mbe_type == MAC_BIBA_TYPE_EQUAL ||
b->mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
return (a->mbe_type == b->mbe_type && a->mbe_grade == b->mbe_grade);
}
static int
mac_biba_equal_effective(struct mac_biba *a, struct mac_biba *b)
{
KASSERT((a->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_equal_effective: a not effective"));
KASSERT((b->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_equal_effective: b not effective"));
return (mac_biba_equal_element(&a->mb_effective, &b->mb_effective));
}
static int
mac_biba_contains_equal(struct mac_biba *mac_biba)
{
if (mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
if (mac_biba->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) {
if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
if (mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (1);
}
return (0);
}
static int
mac_biba_subject_privileged(struct mac_biba *mac_biba)
{
KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
MAC_BIBA_FLAGS_BOTH,
("mac_biba_subject_privileged: subject doesn't have both labels"));
/* If the effective is EQUAL, it's ok. */
if (mac_biba->mb_effective.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (0);
/* If either range endpoint is EQUAL, it's ok. */
if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_EQUAL ||
mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_EQUAL)
return (0);
/* If the range is low-high, it's ok. */
if (mac_biba->mb_rangelow.mbe_type == MAC_BIBA_TYPE_LOW &&
mac_biba->mb_rangehigh.mbe_type == MAC_BIBA_TYPE_HIGH)
return (0);
/* It's not ok. */
return (EPERM);
}
static int
mac_biba_high_effective(struct mac_biba *mac_biba)
{
KASSERT((mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_equal_effective: mac_biba not effective"));
return (mac_biba->mb_effective.mbe_type == MAC_BIBA_TYPE_HIGH);
}
static int
mac_biba_valid(struct mac_biba *mac_biba)
{
if (mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
switch (mac_biba->mb_effective.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mac_biba->mb_effective.mbe_grade != 0 ||
!MAC_BIBA_BIT_SET_EMPTY(
mac_biba->mb_effective.mbe_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
} else {
if (mac_biba->mb_effective.mbe_type != MAC_BIBA_TYPE_UNDEF)
return (EINVAL);
}
if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) {
switch (mac_biba->mb_rangelow.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mac_biba->mb_rangelow.mbe_grade != 0 ||
!MAC_BIBA_BIT_SET_EMPTY(
mac_biba->mb_rangelow.mbe_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
switch (mac_biba->mb_rangehigh.mbe_type) {
case MAC_BIBA_TYPE_GRADE:
break;
case MAC_BIBA_TYPE_EQUAL:
case MAC_BIBA_TYPE_HIGH:
case MAC_BIBA_TYPE_LOW:
if (mac_biba->mb_rangehigh.mbe_grade != 0 ||
!MAC_BIBA_BIT_SET_EMPTY(
mac_biba->mb_rangehigh.mbe_compartments))
return (EINVAL);
break;
default:
return (EINVAL);
}
if (!mac_biba_dominate_element(&mac_biba->mb_rangehigh,
&mac_biba->mb_rangelow))
return (EINVAL);
} else {
if (mac_biba->mb_rangelow.mbe_type != MAC_BIBA_TYPE_UNDEF ||
mac_biba->mb_rangehigh.mbe_type != MAC_BIBA_TYPE_UNDEF)
return (EINVAL);
}
return (0);
}
static void
mac_biba_set_range(struct mac_biba *mac_biba, u_short typelow,
u_short gradelow, u_char *compartmentslow, u_short typehigh,
u_short gradehigh, u_char *compartmentshigh)
{
mac_biba->mb_rangelow.mbe_type = typelow;
mac_biba->mb_rangelow.mbe_grade = gradelow;
if (compartmentslow != NULL)
memcpy(mac_biba->mb_rangelow.mbe_compartments,
compartmentslow,
sizeof(mac_biba->mb_rangelow.mbe_compartments));
mac_biba->mb_rangehigh.mbe_type = typehigh;
mac_biba->mb_rangehigh.mbe_grade = gradehigh;
if (compartmentshigh != NULL)
memcpy(mac_biba->mb_rangehigh.mbe_compartments,
compartmentshigh,
sizeof(mac_biba->mb_rangehigh.mbe_compartments));
mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
static void
mac_biba_set_effective(struct mac_biba *mac_biba, u_short type, u_short grade,
u_char *compartments)
{
mac_biba->mb_effective.mbe_type = type;
mac_biba->mb_effective.mbe_grade = grade;
if (compartments != NULL)
memcpy(mac_biba->mb_effective.mbe_compartments, compartments,
sizeof(mac_biba->mb_effective.mbe_compartments));
mac_biba->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
static void
mac_biba_copy_range(struct mac_biba *labelfrom, struct mac_biba *labelto)
{
KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_RANGE) != 0,
("mac_biba_copy_range: labelfrom not range"));
labelto->mb_rangelow = labelfrom->mb_rangelow;
labelto->mb_rangehigh = labelfrom->mb_rangehigh;
labelto->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
static void
mac_biba_copy_effective(struct mac_biba *labelfrom, struct mac_biba *labelto)
{
KASSERT((labelfrom->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) != 0,
("mac_biba_copy_effective: labelfrom not effective"));
labelto->mb_effective = labelfrom->mb_effective;
labelto->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
static void
mac_biba_copy(struct mac_biba *source, struct mac_biba *dest)
{
if (source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE)
mac_biba_copy_effective(source, dest);
if (source->mb_flags & MAC_BIBA_FLAG_RANGE)
mac_biba_copy_range(source, dest);
}
/*
* Policy module operations.
*/
static void
mac_biba_init(struct mac_policy_conf *conf)
{
zone_biba = uma_zcreate("mac_biba", sizeof(struct mac_biba), NULL,
NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
}
/*
* Label operations.
*/
static void
mac_biba_init_label(struct label *label)
{
SLOT_SET(label, biba_alloc(M_WAITOK));
}
static int
mac_biba_init_label_waitcheck(struct label *label, int flag)
{
SLOT_SET(label, biba_alloc(flag));
if (SLOT(label) == NULL)
return (ENOMEM);
return (0);
}
static void
mac_biba_destroy_label(struct label *label)
{
biba_free(SLOT(label));
SLOT_SET(label, NULL);
}
/*
* mac_biba_element_to_string() accepts an sbuf and Biba element. It
* converts the Biba element to a string and stores the result in the
* sbuf; if there isn't space in the sbuf, -1 is returned.
*/
static int
mac_biba_element_to_string(struct sbuf *sb, struct mac_biba_element *element)
{
int i, first;
switch (element->mbe_type) {
case MAC_BIBA_TYPE_HIGH:
return (sbuf_printf(sb, "high"));
case MAC_BIBA_TYPE_LOW:
return (sbuf_printf(sb, "low"));
case MAC_BIBA_TYPE_EQUAL:
return (sbuf_printf(sb, "equal"));
case MAC_BIBA_TYPE_GRADE:
if (sbuf_printf(sb, "%d", element->mbe_grade) == -1)
return (-1);
first = 1;
for (i = 1; i <= MAC_BIBA_MAX_COMPARTMENTS; i++) {
if (MAC_BIBA_BIT_TEST(i, element->mbe_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("mac_biba_element_to_string: invalid type (%d)",
element->mbe_type);
}
}
/*
* mac_biba_to_string() converts a Biba 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
mac_biba_to_string(struct sbuf *sb, struct mac_biba *mac_biba)
{
if (mac_biba->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
if (mac_biba_element_to_string(sb, &mac_biba->mb_effective)
== -1)
return (EINVAL);
}
if (mac_biba->mb_flags & MAC_BIBA_FLAG_RANGE) {
if (sbuf_putc(sb, '(') == -1)
return (EINVAL);
if (mac_biba_element_to_string(sb, &mac_biba->mb_rangelow)
== -1)
return (EINVAL);
if (sbuf_putc(sb, '-') == -1)
return (EINVAL);
if (mac_biba_element_to_string(sb, &mac_biba->mb_rangehigh)
== -1)
return (EINVAL);
if (sbuf_putc(sb, ')') == -1)
return (EINVAL);
}
return (0);
}
static int
mac_biba_externalize_label(struct label *label, char *element_name,
struct sbuf *sb, int *claimed)
{
struct mac_biba *mac_biba;
if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
mac_biba = SLOT(label);
return (mac_biba_to_string(sb, mac_biba));
}
static int
mac_biba_parse_element(struct mac_biba_element *element, char *string)
{
char *compartment, *end, *grade;
int value;
if (strcmp(string, "high") == 0 ||
strcmp(string, "hi") == 0) {
element->mbe_type = MAC_BIBA_TYPE_HIGH;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else if (strcmp(string, "low") == 0 ||
strcmp(string, "lo") == 0) {
element->mbe_type = MAC_BIBA_TYPE_LOW;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else if (strcmp(string, "equal") == 0 ||
strcmp(string, "eq") == 0) {
element->mbe_type = MAC_BIBA_TYPE_EQUAL;
element->mbe_grade = MAC_BIBA_TYPE_UNDEF;
} else {
element->mbe_type = MAC_BIBA_TYPE_GRADE;
/*
* Numeric grade piece of the element.
*/
grade = strsep(&string, ":");
value = strtol(grade, &end, 10);
if (end == grade || *end != '\0')
return (EINVAL);
if (value < 0 || value > 65535)
return (EINVAL);
element->mbe_grade = 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_BIBA_MAX_COMPARTMENTS)
return (EINVAL);
MAC_BIBA_BIT_SET(value, element->mbe_compartments);
}
}
return (0);
}
/*
* Note: destructively consumes the string, make a local copy before
* calling if that's a problem.
*/
static int
mac_biba_parse(struct mac_biba *mac_biba, 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),
("mac_biba_parse: range mismatch"));
bzero(mac_biba, sizeof(*mac_biba));
if (effective != NULL) {
error = mac_biba_parse_element(&mac_biba->mb_effective, effective);
if (error)
return (error);
mac_biba->mb_flags |= MAC_BIBA_FLAG_EFFECTIVE;
}
if (rangelow != NULL) {
error = mac_biba_parse_element(&mac_biba->mb_rangelow,
rangelow);
if (error)
return (error);
error = mac_biba_parse_element(&mac_biba->mb_rangehigh,
rangehigh);
if (error)
return (error);
mac_biba->mb_flags |= MAC_BIBA_FLAG_RANGE;
}
error = mac_biba_valid(mac_biba);
if (error)
return (error);
return (0);
}
static int
mac_biba_internalize_label(struct label *label, char *element_name,
char *element_data, int *claimed)
{
struct mac_biba *mac_biba, mac_biba_temp;
int error;
if (strcmp(MAC_BIBA_LABEL_NAME, element_name) != 0)
return (0);
(*claimed)++;
error = mac_biba_parse(&mac_biba_temp, element_data);
if (error)
return (error);
mac_biba = SLOT(label);
*mac_biba = mac_biba_temp;
return (0);
}
static void
mac_biba_copy_label(struct label *src, struct label *dest)
{
*SLOT(dest) = *SLOT(src);
}
/*
* Labeling event operations: file system objects, and things that look
* a lot like file system objects.
*/
static void
mac_biba_create_devfs_device(struct ucred *cred, struct mount *mp,
struct cdev *dev, struct devfs_dirent *de, struct label *delabel)
{
struct mac_biba *mac_biba;
int biba_type;
mac_biba = SLOT(delabel);
if (strcmp(dev->si_name, "null") == 0 ||
strcmp(dev->si_name, "zero") == 0 ||
strcmp(dev->si_name, "random") == 0 ||
strncmp(dev->si_name, "fd/", strlen("fd/")) == 0)
biba_type = MAC_BIBA_TYPE_EQUAL;
else if (ptys_equal &&
(strncmp(dev->si_name, "ttyp", strlen("ttyp")) == 0 ||
strncmp(dev->si_name, "ptyp", strlen("ptyp")) == 0))
biba_type = MAC_BIBA_TYPE_EQUAL;
else
biba_type = MAC_BIBA_TYPE_HIGH;
mac_biba_set_effective(mac_biba, biba_type, 0, NULL);
}
static void
mac_biba_create_devfs_directory(struct mount *mp, char *dirname,
int dirnamelen, struct devfs_dirent *de, struct label *delabel)
{
struct mac_biba *mac_biba;
mac_biba = SLOT(delabel);
mac_biba_set_effective(mac_biba, MAC_BIBA_TYPE_HIGH, 0, NULL);
}
static void
mac_biba_create_devfs_symlink(struct ucred *cred, struct mount *mp,
struct devfs_dirent *dd, struct label *ddlabel, struct devfs_dirent *de,
struct label *delabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(delabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_mount(struct ucred *cred, struct mount *mp,
struct label *mplabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(mplabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_relabel_vnode(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(vplabel);
mac_biba_copy(source, dest);
}
static void
mac_biba_update_devfs(struct mount *mp, struct devfs_dirent *de,
struct label *delabel, struct vnode *vp, struct label *vplabel)
{
struct mac_biba *source, *dest;
source = SLOT(vplabel);
dest = SLOT(delabel);
mac_biba_copy(source, dest);
}
static void
mac_biba_associate_vnode_devfs(struct mount *mp, struct label *mntlabel,
struct devfs_dirent *de, struct label *delabel, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *source, *dest;
source = SLOT(delabel);
dest = SLOT(vplabel);
mac_biba_copy_effective(source, dest);
}
static int
mac_biba_associate_vnode_extattr(struct mount *mp, struct label *mplabel,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba temp, *source, *dest;
int buflen, error;
source = SLOT(mplabel);
dest = SLOT(vplabel);
buflen = sizeof(temp);
bzero(&temp, buflen);
error = vn_extattr_get(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, &buflen, (char *) &temp, curthread);
if (error == ENOATTR || error == EOPNOTSUPP) {
/* Fall back to the mntlabel. */
mac_biba_copy_effective(source, dest);
return (0);
} else if (error)
return (error);
if (buflen != sizeof(temp)) {
printf("mac_biba_associate_vnode_extattr: bad size %d\n",
buflen);
return (EPERM);
}
if (mac_biba_valid(&temp) != 0) {
printf("mac_biba_associate_vnode_extattr: invalid\n");
return (EPERM);
}
if ((temp.mb_flags & MAC_BIBA_FLAGS_BOTH) != MAC_BIBA_FLAG_EFFECTIVE) {
printf("mac_biba_associate_vnode_extattr: not effective\n");
return (EPERM);
}
mac_biba_copy_effective(&temp, dest);
return (0);
}
static void
mac_biba_associate_vnode_singlelabel(struct mount *mp,
struct label *mplabel, struct vnode *vp, struct label *vplabel)
{
struct mac_biba *source, *dest;
source = SLOT(mplabel);
dest = SLOT(vplabel);
mac_biba_copy_effective(source, dest);
}
static int
mac_biba_create_vnode_extattr(struct ucred *cred, struct mount *mp,
struct label *mplabel, struct vnode *dvp, struct label *dvplabel,
struct vnode *vp, struct label *vplabel, struct componentname *cnp)
{
struct mac_biba *source, *dest, temp;
size_t buflen;
int error;
buflen = sizeof(temp);
bzero(&temp, buflen);
source = SLOT(cred->cr_label);
dest = SLOT(vplabel);
mac_biba_copy_effective(source, &temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread);
if (error == 0)
mac_biba_copy_effective(source, dest);
return (error);
}
static int
mac_biba_setlabel_vnode_extattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *intlabel)
{
struct mac_biba *source, temp;
size_t buflen;
int error;
buflen = sizeof(temp);
bzero(&temp, buflen);
source = SLOT(intlabel);
if ((source->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) == 0)
return (0);
mac_biba_copy_effective(source, &temp);
error = vn_extattr_set(vp, IO_NODELOCKED, MAC_BIBA_EXTATTR_NAMESPACE,
MAC_BIBA_EXTATTR_NAME, buflen, (char *) &temp, curthread);
return (error);
}
/*
* Labeling event operations: IPC object.
*/
static void
mac_biba_create_inpcb_from_socket(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_biba *source, *dest;
source = SLOT(solabel);
dest = SLOT(inplabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_mbuf_from_socket(struct socket *so, struct label *solabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(solabel);
dest = SLOT(mlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_socket(struct ucred *cred, struct socket *so,
struct label *solabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(solabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_pipe(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(pplabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_posix_sem(struct ucred *cred, struct ksem *ks,
struct label *kslabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(kslabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_socket_from_socket(struct socket *oldso,
struct label *oldsolabel, struct socket *newso, struct label *newsolabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldsolabel);
dest = SLOT(newsolabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_relabel_socket(struct ucred *cred, struct socket *so,
struct label *solabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(solabel);
mac_biba_copy(source, dest);
}
static void
mac_biba_relabel_pipe(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(pplabel);
mac_biba_copy(source, dest);
}
static void
mac_biba_set_socket_peer_from_mbuf(struct mbuf *m, struct label *mlabel,
struct socket *so, struct label *sopeerlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(sopeerlabel);
mac_biba_copy_effective(source, dest);
}
/*
* Labeling event operations: System V IPC objects.
*/
static void
mac_biba_create_sysv_msgmsg(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqlabel, struct msg *msgptr, struct label *msglabel)
{
struct mac_biba *source, *dest;
/* Ignore the msgq label */
source = SLOT(cred->cr_label);
dest = SLOT(msglabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_sysv_msgqueue(struct ucred *cred,
struct msqid_kernel *msqkptr, struct label *msqlabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(msqlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_sysv_sem(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semalabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(semalabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_sysv_shm(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmlabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(shmlabel);
mac_biba_copy_effective(source, dest);
}
/*
* Labeling event operations: network objects.
*/
static void
mac_biba_set_socket_peer_from_socket(struct socket *oldso,
struct label *oldsolabel, struct socket *newso,
struct label *newsopeerlabel)
{
struct mac_biba *source, *dest;
source = SLOT(oldsolabel);
dest = SLOT(newsopeerlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_bpfdesc(struct ucred *cred, struct bpf_d *d,
struct label *dlabel)
{
struct mac_biba *source, *dest;
source = SLOT(cred->cr_label);
dest = SLOT(dlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_ifnet(struct ifnet *ifp, struct label *ifplabel)
{
char tifname[IFNAMSIZ], *p, *q;
char tiflist[sizeof(trusted_interfaces)];
struct mac_biba *dest;
int len, type;
dest = SLOT(ifplabel);
if (ifp->if_type == IFT_LOOP || interfaces_equal != 0) {
type = MAC_BIBA_TYPE_EQUAL;
goto set;
}
if (trust_all_interfaces) {
type = MAC_BIBA_TYPE_HIGH;
goto set;
}
type = MAC_BIBA_TYPE_LOW;
if (trusted_interfaces[0] == '\0' ||
!strvalid(trusted_interfaces, sizeof(trusted_interfaces)))
goto set;
bzero(tiflist, sizeof(tiflist));
for (p = trusted_interfaces, q = tiflist; *p != '\0'; p++, q++)
if(*p != ' ' && *p != '\t')
*q = *p;
for (p = q = tiflist;; p++) {
if (*p == ',' || *p == '\0') {
len = p - q;
if (len < IFNAMSIZ) {
bzero(tifname, sizeof(tifname));
bcopy(q, tifname, len);
if (strcmp(tifname, ifp->if_xname) == 0) {
type = MAC_BIBA_TYPE_HIGH;
break;
}
} else {
*p = '\0';
printf("mac_biba warning: interface name "
"\"%s\" is too long (must be < %d)\n",
q, IFNAMSIZ);
}
if (*p == '\0')
break;
q = p + 1;
}
}
set:
mac_biba_set_effective(dest, type, 0, NULL);
mac_biba_set_range(dest, type, 0, NULL, type, 0, NULL);
}
static void
mac_biba_create_ipq(struct mbuf *m, struct label *mlabel, struct ipq *ipq,
struct label *ipqlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(ipqlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_datagram_from_ipq(struct ipq *ipq, struct label *ipqlabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(ipqlabel);
dest = SLOT(mlabel);
/* Just use the head, since we require them all to match. */
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_fragment(struct mbuf *m, struct label *mlabel,
struct mbuf *frag, struct label *fraglabel)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(fraglabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_mbuf_from_inpcb(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(inplabel);
dest = SLOT(mlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_mbuf_linklayer(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *dest;
dest = SLOT(mlabel);
mac_biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
}
static void
mac_biba_create_mbuf_from_bpfdesc(struct bpf_d *d, struct label *dlabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(dlabel);
dest = SLOT(mlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_mbuf_from_ifnet(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(ifplabel);
dest = SLOT(mlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_mbuf_multicast_encap(struct mbuf *m, struct label *mlabel,
struct ifnet *ifp, struct label *ifplabel, struct mbuf *mnew,
struct label *mnewlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(mnewlabel);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_mbuf_netlayer(struct mbuf *m, struct label *mlabel,
struct mbuf *newm, struct label *mnewlabel)
{
struct mac_biba *source, *dest;
source = SLOT(mlabel);
dest = SLOT(mnewlabel);
mac_biba_copy_effective(source, dest);
}
static int
mac_biba_fragment_match(struct mbuf *m, struct label *mlabel,
struct ipq *ipq, struct label *ipqlabel)
{
struct mac_biba *a, *b;
a = SLOT(ipqlabel);
b = SLOT(mlabel);
return (mac_biba_equal_effective(a, b));
}
static void
mac_biba_relabel_ifnet(struct ucred *cred, struct ifnet *ifp,
struct label *ifplabel, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(ifplabel);
mac_biba_copy(source, dest);
}
static void
mac_biba_update_ipq(struct mbuf *m, struct label *mlabel, struct ipq *ipq,
struct label *ipqlabel)
{
/* NOOP: we only accept matching labels, so no need to update */
}
static void
mac_biba_inpcb_sosetlabel(struct socket *so, struct label *solabel,
struct inpcb *inp, struct label *inplabel)
{
struct mac_biba *source, *dest;
source = SLOT(solabel);
dest = SLOT(inplabel);
mac_biba_copy(source, dest);
}
static void
mac_biba_create_mbuf_from_firewall(struct mbuf *m, struct label *label)
{
struct mac_biba *dest;
dest = SLOT(label);
/* XXX: where is the label for the firewall really comming from? */
mac_biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
}
/*
* Labeling event operations: processes.
*/
static void
mac_biba_create_proc0(struct ucred *cred)
{
struct mac_biba *dest;
dest = SLOT(cred->cr_label);
mac_biba_set_effective(dest, MAC_BIBA_TYPE_EQUAL, 0, NULL);
mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL,
MAC_BIBA_TYPE_HIGH, 0, NULL);
}
static void
mac_biba_create_proc1(struct ucred *cred)
{
struct mac_biba *dest;
dest = SLOT(cred->cr_label);
mac_biba_set_effective(dest, MAC_BIBA_TYPE_HIGH, 0, NULL);
mac_biba_set_range(dest, MAC_BIBA_TYPE_LOW, 0, NULL,
MAC_BIBA_TYPE_HIGH, 0, NULL);
}
static void
mac_biba_relabel_cred(struct ucred *cred, struct label *newlabel)
{
struct mac_biba *source, *dest;
source = SLOT(newlabel);
dest = SLOT(cred->cr_label);
mac_biba_copy(source, dest);
}
/*
* Label cleanup/flush operations
*/
static void
mac_biba_cleanup_sysv_msgmsg(struct label *msglabel)
{
bzero(SLOT(msglabel), sizeof(struct mac_biba));
}
static void
mac_biba_cleanup_sysv_msgqueue(struct label *msqlabel)
{
bzero(SLOT(msqlabel), sizeof(struct mac_biba));
}
static void
mac_biba_cleanup_sysv_sem(struct label *semalabel)
{
bzero(SLOT(semalabel), sizeof(struct mac_biba));
}
static void
mac_biba_cleanup_sysv_shm(struct label *shmlabel)
{
bzero(SLOT(shmlabel), sizeof(struct mac_biba));
}
/*
* Access control checks.
*/
static int
mac_biba_check_bpfdesc_receive(struct bpf_d *d, struct label *dlabel,
struct ifnet *ifp, struct label *ifplabel)
{
struct mac_biba *a, *b;
if (!mac_biba_enabled)
return (0);
a = SLOT(dlabel);
b = SLOT(ifplabel);
if (mac_biba_equal_effective(a, b))
return (0);
return (EACCES);
}
static int
mac_biba_check_cred_relabel(struct ucred *cred, struct label *newlabel)
{
struct mac_biba *subj, *new;
int error;
subj = SLOT(cred->cr_label);
new = SLOT(newlabel);
/*
* If there is a Biba label update for the credential, it may
* be an update of the effective, range, or both.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
if (error)
return (error);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAGS_BOTH) {
/*
* If the change request modifies both the Biba label
* effective and range, check that the new effective will be
* in the new range.
*/
if ((new->mb_flags & MAC_BIBA_FLAGS_BOTH) ==
MAC_BIBA_FLAGS_BOTH &&
!mac_biba_effective_in_range(new, new))
return (EINVAL);
/*
* To change the Biba effective label on a credential, the
* new effective label must be in the current range.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE &&
!mac_biba_effective_in_range(new, subj))
return (EPERM);
/*
* To change the Biba range on a credential, the new
* range label must be in the current range.
*/
if (new->mb_flags & MAC_BIBA_FLAG_RANGE &&
!mac_biba_range_in_range(new, subj))
return (EPERM);
/*
* To have EQUAL in any component of the new credential
* Biba label, the subject must already have EQUAL in
* their label.
*/
if (mac_biba_contains_equal(new)) {
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_biba_check_cred_visible(struct ucred *u1, struct ucred *u2)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(u1->cr_label);
obj = SLOT(u2->cr_label);
/* XXX: range */
if (!mac_biba_dominate_effective(obj, subj))
return (ESRCH);
return (0);
}
static int
mac_biba_check_ifnet_relabel(struct ucred *cred, struct ifnet *ifp,
struct label *ifplabel, struct label *newlabel)
{
struct mac_biba *subj, *new;
int error;
subj = SLOT(cred->cr_label);
new = SLOT(newlabel);
/*
* If there is a Biba label update for the interface, it may
* be an update of the effective, range, or both.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAGS_BOTH);
if (error)
return (error);
/*
* Relabling network interfaces requires Biba privilege.
*/
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
mac_biba_check_ifnet_transmit(struct ifnet *ifp, struct label *ifplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *p, *i;
if (!mac_biba_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(ifplabel);
return (mac_biba_effective_in_range(p, i) ? 0 : EACCES);
}
static int
mac_biba_check_inpcb_deliver(struct inpcb *inp, struct label *inplabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *p, *i;
if (!mac_biba_enabled)
return (0);
p = SLOT(mlabel);
i = SLOT(inplabel);
return (mac_biba_equal_effective(p, i) ? 0 : EACCES);
}
static int
mac_biba_check_sysv_msgrcv(struct ucred *cred, struct msg *msgptr,
struct label *msglabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msglabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msgrmid(struct ucred *cred, struct msg *msgptr,
struct label *msglabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msglabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msqget(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msqsnd(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msqrcv(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_msqctl(struct ucred *cred, struct msqid_kernel *msqkptr,
struct label *msqklabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(msqklabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
mac_biba_check_sysv_semctl(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
case SETVAL:
case SETALL:
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
case GETVAL:
case GETPID:
case GETNCNT:
case GETZCNT:
case GETALL:
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
mac_biba_check_sysv_semget(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_semop(struct ucred *cred, struct semid_kernel *semakptr,
struct label *semaklabel, size_t accesstype)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(semaklabel);
if (accesstype & SEM_R)
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
if (accesstype & SEM_A)
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_sysv_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int shmflg)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
if ((shmflg & SHM_RDONLY) == 0) {
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_biba_check_sysv_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int cmd)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
switch(cmd) {
case IPC_RMID:
case IPC_SET:
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
break;
case IPC_STAT:
case SHM_STAT:
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
break;
default:
return (EACCES);
}
return (0);
}
static int
mac_biba_check_sysv_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
struct label *shmseglabel, int shmflg)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(shmseglabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_kld_load(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
obj = SLOT(vplabel);
if (!mac_biba_high_effective(obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_mount_stat(struct ucred *cred, struct mount *mp,
struct label *mplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(mplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_ioctl(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, unsigned long cmd, void /* caddr_t */ *data)
{
if(!mac_biba_enabled)
return (0);
/* XXX: This will be implemented soon... */
return (0);
}
static int
mac_biba_check_pipe_poll(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_read(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_relabel(struct ucred *cred, struct pipepair *pp,
struct label *pplabel, struct label *newlabel)
{
struct mac_biba *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
/*
* If there is a Biba label update for a pipe, it must be a
* effective update.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To perform a relabel of a pipe (Biba label or not), Biba must
* authorize the relabel.
*/
if (!mac_biba_effective_in_range(obj, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To change the Biba label on a pipe, the new pipe label
* must be in the subject range.
*/
if (!mac_biba_effective_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on a pipe to be EQUAL, the
* subject must have appropriate privilege.
*/
if (mac_biba_contains_equal(new)) {
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_biba_check_pipe_stat(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_pipe_write(struct ucred *cred, struct pipepair *pp,
struct label *pplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(pplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_posix_sem_write(struct ucred *cred, struct ksem *ks,
struct label *kslabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(kslabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_posix_sem_rdonly(struct ucred *cred, struct ksem *ks,
struct label *kslabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(kslabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_proc_debug(struct ucred *cred, struct proc *p)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_biba_dominate_effective(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_proc_sched(struct ucred *cred, struct proc *p)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_biba_dominate_effective(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_proc_signal(struct ucred *cred, struct proc *p, int signum)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(p->p_ucred->cr_label);
/* XXX: range checks */
if (!mac_biba_dominate_effective(obj, subj))
return (ESRCH);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_socket_deliver(struct socket *so, struct label *solabel,
struct mbuf *m, struct label *mlabel)
{
struct mac_biba *p, *s;
if (!mac_biba_enabled)
return (0);
p = SLOT(mlabel);
s = SLOT(solabel);
return (mac_biba_equal_effective(p, s) ? 0 : EACCES);
}
static int
mac_biba_check_socket_relabel(struct ucred *cred, struct socket *so,
struct label *solabel, struct label *newlabel)
{
struct mac_biba *subj, *obj, *new;
int error;
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
obj = SLOT(solabel);
/*
* If there is a Biba label update for the socket, it may be
* an update of effective.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To relabel a socket, the old socket effective must be in the subject
* range.
*/
if (!mac_biba_effective_in_range(obj, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To relabel a socket, the new socket effective must be in
* the subject range.
*/
if (!mac_biba_effective_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on the socket to contain EQUAL,
* the subject must have appropriate privilege.
*/
if (mac_biba_contains_equal(new)) {
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_biba_check_socket_visible(struct ucred *cred, struct socket *so,
struct label *solabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(solabel);
if (!mac_biba_dominate_effective(obj, subj))
return (ENOENT);
return (0);
}
/*
* Some system privileges are allowed regardless of integrity grade; others
* are allowed only when running with privilege with respect to the Biba
* policy as they might otherwise allow bypassing of the integrity policy.
*/
static int
mac_biba_priv_check(struct ucred *cred, int priv)
{
struct mac_biba *subj;
int error;
if (!mac_biba_enabled)
return (0);
/*
* Exempt only specific privileges from the Biba integrity policy.
*/
switch (priv) {
case PRIV_KTRACE:
case PRIV_MSGBUF:
/*
* Allow processes to manipulate basic process audit properties, and
* to submit audit records.
*/
case PRIV_AUDIT_GETAUDIT:
case PRIV_AUDIT_SETAUDIT:
case PRIV_AUDIT_SUBMIT:
/*
* Allow processes to manipulate their regular UNIX credentials.
*/
case PRIV_CRED_SETUID:
case PRIV_CRED_SETEUID:
case PRIV_CRED_SETGID:
case PRIV_CRED_SETEGID:
case PRIV_CRED_SETGROUPS:
case PRIV_CRED_SETREUID:
case PRIV_CRED_SETREGID:
case PRIV_CRED_SETRESUID:
case PRIV_CRED_SETRESGID:
/*
* Allow processes to perform system monitoring.
*/
case PRIV_SEEOTHERGIDS:
case PRIV_SEEOTHERUIDS:
break;
/*
* Allow access to general process debugging facilities. We
* separately control debugging based on MAC label.
*/
case PRIV_DEBUG_DIFFCRED:
case PRIV_DEBUG_SUGID:
case PRIV_DEBUG_UNPRIV:
/*
* Allow manipulating jails.
*/
case PRIV_JAIL_ATTACH:
/*
* Allow privilege with respect to the Partition policy, but not the
* Privs policy.
*/
case PRIV_MAC_PARTITION:
/*
* Allow privilege with respect to process resource limits and login
* context.
*/
case PRIV_PROC_LIMIT:
case PRIV_PROC_SETLOGIN:
case PRIV_PROC_SETRLIMIT:
/*
* Allow System V and POSIX IPC privileges.
*/
case PRIV_IPC_READ:
case PRIV_IPC_WRITE:
case PRIV_IPC_ADMIN:
case PRIV_IPC_MSGSIZE:
case PRIV_MQ_ADMIN:
/*
* Allow certain scheduler manipulations -- possibly this should be
* controlled by more fine-grained policy, as potentially low
* integrity processes can deny CPU to higher integrity ones.
*/
case PRIV_SCHED_DIFFCRED:
case PRIV_SCHED_SETPRIORITY:
case PRIV_SCHED_RTPRIO:
case PRIV_SCHED_SETPOLICY:
case PRIV_SCHED_SET:
case PRIV_SCHED_SETPARAM:
/*
* More IPC privileges.
*/
case PRIV_SEM_WRITE:
/*
* Allow signaling privileges subject to integrity policy.
*/
case PRIV_SIGNAL_DIFFCRED:
case PRIV_SIGNAL_SUGID:
/*
* Allow access to only limited sysctls from lower integrity levels;
* piggy-back on the Jail definition.
*/
case PRIV_SYSCTL_WRITEJAIL:
/*
* Allow TTY-based privileges, subject to general device access using
* labels on TTY device nodes, but not console privilege.
*/
case PRIV_TTY_DRAINWAIT:
case PRIV_TTY_DTRWAIT:
case PRIV_TTY_EXCLUSIVE:
case PRIV_TTY_PRISON:
case PRIV_TTY_STI:
case PRIV_TTY_SETA:
/*
* Grant most VFS privileges, as almost all are in practice bounded
* by more specific checks using labels.
*/
case PRIV_VFS_READ:
case PRIV_VFS_WRITE:
case PRIV_VFS_ADMIN:
case PRIV_VFS_EXEC:
case PRIV_VFS_LOOKUP:
case PRIV_VFS_CHFLAGS_DEV:
case PRIV_VFS_CHOWN:
case PRIV_VFS_CHROOT:
case PRIV_VFS_RETAINSUGID:
case PRIV_VFS_EXCEEDQUOTA:
case PRIV_VFS_FCHROOT:
case PRIV_VFS_FHOPEN:
case PRIV_VFS_FHSTATFS:
case PRIV_VFS_GENERATION:
case PRIV_VFS_GETFH:
case PRIV_VFS_GETQUOTA:
case PRIV_VFS_LINK:
case PRIV_VFS_MOUNT:
case PRIV_VFS_MOUNT_OWNER:
case PRIV_VFS_MOUNT_PERM:
case PRIV_VFS_MOUNT_SUIDDIR:
case PRIV_VFS_MOUNT_NONUSER:
case PRIV_VFS_SETGID:
case PRIV_VFS_STICKYFILE:
case PRIV_VFS_SYSFLAGS:
case PRIV_VFS_UNMOUNT:
/*
* Allow VM privileges; it would be nice if these were subject to
* resource limits.
*/
case PRIV_VM_MADV_PROTECT:
case PRIV_VM_MLOCK:
case PRIV_VM_MUNLOCK:
/*
* Allow some but not all network privileges. In general, dont allow
* reconfiguring the network stack, just normal use.
*/
case PRIV_NETATALK_RESERVEDPORT:
case PRIV_NETINET_RESERVEDPORT:
case PRIV_NETINET_RAW:
case PRIV_NETINET_REUSEPORT:
case PRIV_NETIPX_RESERVEDPORT:
case PRIV_NETIPX_RAW:
break;
/*
* All remaining system privileges are allow only if the process
* holds privilege with respect to the Biba policy.
*/
default:
subj = SLOT(cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
return (0);
}
static int
mac_biba_check_system_acct(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
if (vplabel == NULL)
return (0);
obj = SLOT(vplabel);
if (!mac_biba_high_effective(obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_system_auditctl(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
if (vplabel == NULL)
return (0);
obj = SLOT(vplabel);
if (!mac_biba_high_effective(obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_system_auditon(struct ucred *cred, int cmd)
{
struct mac_biba *subj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
mac_biba_check_system_swapon(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
if (!mac_biba_high_effective(obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_system_swapoff(struct ucred *cred, struct vnode *vp,
struct label *label)
{
struct mac_biba *subj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
return (0);
}
static int
mac_biba_check_system_sysctl(struct ucred *cred, struct sysctl_oid *oidp,
void *arg1, int arg2, struct sysctl_req *req)
{
struct mac_biba *subj;
int error;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
/*
* Treat sysctl variables without CTLFLAG_ANYBODY flag as
* biba/high, but also require privilege to change them.
*/
if (req->newptr != NULL && (oidp->oid_kind & CTLFLAG_ANYBODY) == 0) {
if (!mac_biba_subject_dominate_high(subj))
return (EACCES);
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
return (0);
}
static int
mac_biba_check_vnode_chdir(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_chroot(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_create(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct componentname *cnp, struct vattr *vap)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_deleteacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_deleteextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_exec(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct image_params *imgp,
struct label *execlabel)
{
struct mac_biba *subj, *obj, *exec;
int error;
if (execlabel != NULL) {
/*
* We currently don't permit labels to be changed at
* exec-time as part of Biba, so disallow non-NULL
* Biba label elements in the execlabel.
*/
exec = SLOT(execlabel);
error = biba_atmostflags(exec, 0);
if (error)
return (error);
}
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_getacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_getextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name,
struct uio *uio)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_link(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_listextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_lookup(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_mmap(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int prot, int flags)
{
struct mac_biba *subj, *obj;
/*
* Rely on the use of open()-time protections to handle
* non-revocation cases.
*/
if (!mac_biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
}
if (((prot & VM_PROT_WRITE) != 0) && ((flags & MAP_SHARED) != 0)) {
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_biba_check_vnode_open(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int acc_mode)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
/* XXX privilege override for admin? */
if (acc_mode & (VREAD | VEXEC | VSTAT)) {
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
}
if (acc_mode & (VWRITE | VAPPEND | VADMIN)) {
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_biba_check_vnode_poll(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_read(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_readdir(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_readlink(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_relabel(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct label *newlabel)
{
struct mac_biba *old, *new, *subj;
int error;
old = SLOT(vplabel);
new = SLOT(newlabel);
subj = SLOT(cred->cr_label);
/*
* If there is a Biba label update for the vnode, it must be a
* effective label.
*/
error = biba_atmostflags(new, MAC_BIBA_FLAG_EFFECTIVE);
if (error)
return (error);
/*
* To perform a relabel of the vnode (Biba label or not), Biba must
* authorize the relabel.
*/
if (!mac_biba_effective_in_range(old, subj))
return (EPERM);
/*
* If the Biba label is to be changed, authorize as appropriate.
*/
if (new->mb_flags & MAC_BIBA_FLAG_EFFECTIVE) {
/*
* To change the Biba label on a vnode, the new vnode label
* must be in the subject range.
*/
if (!mac_biba_effective_in_range(new, subj))
return (EPERM);
/*
* To change the Biba label on the vnode to be EQUAL,
* the subject must have appropriate privilege.
*/
if (mac_biba_contains_equal(new)) {
error = mac_biba_subject_privileged(subj);
if (error)
return (error);
}
}
return (0);
}
static int
mac_biba_check_vnode_rename_from(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_rename_to(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
int samedir, struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
if (vp != NULL) {
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
}
return (0);
}
static int
mac_biba_check_vnode_revoke(struct ucred *cred, struct vnode *vp,
struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setacl(struct ucred *cred, struct vnode *vp,
struct label *vplabel, acl_type_t type, struct acl *acl)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setextattr(struct ucred *cred, struct vnode *vp,
struct label *vplabel, int attrnamespace, const char *name,
struct uio *uio)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
/* XXX: protect the MAC EA in a special way? */
return (0);
}
static int
mac_biba_check_vnode_setflags(struct ucred *cred, struct vnode *vp,
struct label *vplabel, u_long flags)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setmode(struct ucred *cred, struct vnode *vp,
struct label *vplabel, mode_t mode)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setowner(struct ucred *cred, struct vnode *vp,
struct label *vplabel, uid_t uid, gid_t gid)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_setutimes(struct ucred *cred, struct vnode *vp,
struct label *vplabel, struct timespec atime, struct timespec mtime)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_stat(struct ucred *active_cred, struct ucred *file_cred,
struct vnode *vp, struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(obj, subj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_unlink(struct ucred *cred, struct vnode *dvp,
struct label *dvplabel, struct vnode *vp, struct label *vplabel,
struct componentname *cnp)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled)
return (0);
subj = SLOT(cred->cr_label);
obj = SLOT(dvplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static int
mac_biba_check_vnode_write(struct ucred *active_cred,
struct ucred *file_cred, struct vnode *vp, struct label *vplabel)
{
struct mac_biba *subj, *obj;
if (!mac_biba_enabled || !revocation_enabled)
return (0);
subj = SLOT(active_cred->cr_label);
obj = SLOT(vplabel);
if (!mac_biba_dominate_effective(subj, obj))
return (EACCES);
return (0);
}
static void
mac_biba_associate_nfsd_label(struct ucred *cred)
{
struct mac_biba *label;
label = SLOT(cred->cr_label);
mac_biba_set_effective(label, MAC_BIBA_TYPE_LOW, 0, NULL);
mac_biba_set_range(label, MAC_BIBA_TYPE_LOW, 0, NULL,
MAC_BIBA_TYPE_HIGH, 0, NULL);
}
static void
mac_biba_init_syncache_from_inpcb(struct label *label, struct inpcb *inp)
{
struct mac_biba *source, *dest;
source = SLOT(inp->inp_label);
dest = SLOT(label);
mac_biba_copy_effective(source, dest);
}
static void
mac_biba_create_mbuf_from_syncache(struct label *sc_label, struct mbuf *m,
struct label *mlabel)
{
struct mac_biba *source, *dest;
source = SLOT(sc_label);
dest = SLOT(mlabel);
mac_biba_copy_effective(source, dest);
}
static struct mac_policy_ops mac_biba_ops =
{
.mpo_init = mac_biba_init,
.mpo_init_bpfdesc_label = mac_biba_init_label,
.mpo_init_cred_label = mac_biba_init_label,
.mpo_init_devfs_label = mac_biba_init_label,
.mpo_init_ifnet_label = mac_biba_init_label,
.mpo_init_inpcb_label = mac_biba_init_label_waitcheck,
.mpo_init_syncache_label = mac_biba_init_label_waitcheck,
.mpo_init_sysv_msgmsg_label = mac_biba_init_label,
.mpo_init_sysv_msgqueue_label = mac_biba_init_label,
.mpo_init_sysv_sem_label = mac_biba_init_label,
.mpo_init_sysv_shm_label = mac_biba_init_label,
.mpo_init_ipq_label = mac_biba_init_label_waitcheck,
.mpo_init_mbuf_label = mac_biba_init_label_waitcheck,
.mpo_init_mount_label = mac_biba_init_label,
.mpo_init_pipe_label = mac_biba_init_label,
.mpo_init_posix_sem_label = mac_biba_init_label,
.mpo_init_socket_label = mac_biba_init_label_waitcheck,
.mpo_init_socket_peer_label = mac_biba_init_label_waitcheck,
.mpo_init_syncache_from_inpcb = mac_biba_init_syncache_from_inpcb,
.mpo_init_vnode_label = mac_biba_init_label,
.mpo_destroy_bpfdesc_label = mac_biba_destroy_label,
.mpo_destroy_cred_label = mac_biba_destroy_label,
.mpo_destroy_devfs_label = mac_biba_destroy_label,
.mpo_destroy_ifnet_label = mac_biba_destroy_label,
.mpo_destroy_inpcb_label = mac_biba_destroy_label,
.mpo_destroy_syncache_label = mac_biba_destroy_label,
.mpo_destroy_sysv_msgmsg_label = mac_biba_destroy_label,
.mpo_destroy_sysv_msgqueue_label = mac_biba_destroy_label,
.mpo_destroy_sysv_sem_label = mac_biba_destroy_label,
.mpo_destroy_sysv_shm_label = mac_biba_destroy_label,
.mpo_destroy_ipq_label = mac_biba_destroy_label,
.mpo_destroy_mbuf_label = mac_biba_destroy_label,
.mpo_destroy_mount_label = mac_biba_destroy_label,
.mpo_destroy_pipe_label = mac_biba_destroy_label,
.mpo_destroy_posix_sem_label = mac_biba_destroy_label,
.mpo_destroy_socket_label = mac_biba_destroy_label,
.mpo_destroy_socket_peer_label = mac_biba_destroy_label,
.mpo_destroy_vnode_label = mac_biba_destroy_label,
.mpo_copy_cred_label = mac_biba_copy_label,
.mpo_copy_ifnet_label = mac_biba_copy_label,
.mpo_copy_mbuf_label = mac_biba_copy_label,
.mpo_copy_pipe_label = mac_biba_copy_label,
.mpo_copy_socket_label = mac_biba_copy_label,
.mpo_copy_vnode_label = mac_biba_copy_label,
.mpo_externalize_cred_label = mac_biba_externalize_label,
.mpo_externalize_ifnet_label = mac_biba_externalize_label,
.mpo_externalize_pipe_label = mac_biba_externalize_label,
.mpo_externalize_socket_label = mac_biba_externalize_label,
.mpo_externalize_socket_peer_label = mac_biba_externalize_label,
.mpo_externalize_vnode_label = mac_biba_externalize_label,
.mpo_internalize_cred_label = mac_biba_internalize_label,
.mpo_internalize_ifnet_label = mac_biba_internalize_label,
.mpo_internalize_pipe_label = mac_biba_internalize_label,
.mpo_internalize_socket_label = mac_biba_internalize_label,
.mpo_internalize_vnode_label = mac_biba_internalize_label,
.mpo_create_devfs_device = mac_biba_create_devfs_device,
.mpo_create_devfs_directory = mac_biba_create_devfs_directory,
.mpo_create_devfs_symlink = mac_biba_create_devfs_symlink,
.mpo_create_mount = mac_biba_create_mount,
.mpo_relabel_vnode = mac_biba_relabel_vnode,
.mpo_update_devfs = mac_biba_update_devfs,
.mpo_associate_vnode_devfs = mac_biba_associate_vnode_devfs,
.mpo_associate_vnode_extattr = mac_biba_associate_vnode_extattr,
.mpo_associate_vnode_singlelabel = mac_biba_associate_vnode_singlelabel,
.mpo_create_vnode_extattr = mac_biba_create_vnode_extattr,
.mpo_setlabel_vnode_extattr = mac_biba_setlabel_vnode_extattr,
.mpo_create_mbuf_from_socket = mac_biba_create_mbuf_from_socket,
.mpo_create_mbuf_from_syncache = mac_biba_create_mbuf_from_syncache,
.mpo_create_pipe = mac_biba_create_pipe,
.mpo_create_posix_sem = mac_biba_create_posix_sem,
.mpo_create_socket = mac_biba_create_socket,
.mpo_create_socket_from_socket = mac_biba_create_socket_from_socket,
.mpo_relabel_pipe = mac_biba_relabel_pipe,
.mpo_relabel_socket = mac_biba_relabel_socket,
.mpo_set_socket_peer_from_mbuf = mac_biba_set_socket_peer_from_mbuf,
.mpo_set_socket_peer_from_socket = mac_biba_set_socket_peer_from_socket,
.mpo_create_bpfdesc = mac_biba_create_bpfdesc,
.mpo_create_datagram_from_ipq = mac_biba_create_datagram_from_ipq,
.mpo_create_fragment = mac_biba_create_fragment,
.mpo_create_ifnet = mac_biba_create_ifnet,
.mpo_create_inpcb_from_socket = mac_biba_create_inpcb_from_socket,
.mpo_create_sysv_msgmsg = mac_biba_create_sysv_msgmsg,
.mpo_create_sysv_msgqueue = mac_biba_create_sysv_msgqueue,
.mpo_create_sysv_sem = mac_biba_create_sysv_sem,
.mpo_create_sysv_shm = mac_biba_create_sysv_shm,
.mpo_create_ipq = mac_biba_create_ipq,
.mpo_create_mbuf_from_inpcb = mac_biba_create_mbuf_from_inpcb,
.mpo_create_mbuf_linklayer = mac_biba_create_mbuf_linklayer,
.mpo_create_mbuf_from_bpfdesc = mac_biba_create_mbuf_from_bpfdesc,
.mpo_create_mbuf_from_ifnet = mac_biba_create_mbuf_from_ifnet,
.mpo_create_mbuf_multicast_encap = mac_biba_create_mbuf_multicast_encap,
.mpo_create_mbuf_netlayer = mac_biba_create_mbuf_netlayer,
.mpo_fragment_match = mac_biba_fragment_match,
.mpo_relabel_ifnet = mac_biba_relabel_ifnet,
.mpo_update_ipq = mac_biba_update_ipq,
.mpo_inpcb_sosetlabel = mac_biba_inpcb_sosetlabel,
.mpo_create_proc0 = mac_biba_create_proc0,
.mpo_create_proc1 = mac_biba_create_proc1,
.mpo_relabel_cred = mac_biba_relabel_cred,
.mpo_cleanup_sysv_msgmsg = mac_biba_cleanup_sysv_msgmsg,
.mpo_cleanup_sysv_msgqueue = mac_biba_cleanup_sysv_msgqueue,
.mpo_cleanup_sysv_sem = mac_biba_cleanup_sysv_sem,
.mpo_cleanup_sysv_shm = mac_biba_cleanup_sysv_shm,
.mpo_check_bpfdesc_receive = mac_biba_check_bpfdesc_receive,
.mpo_check_cred_relabel = mac_biba_check_cred_relabel,
.mpo_check_cred_visible = mac_biba_check_cred_visible,
.mpo_check_ifnet_relabel = mac_biba_check_ifnet_relabel,
.mpo_check_ifnet_transmit = mac_biba_check_ifnet_transmit,
.mpo_check_inpcb_deliver = mac_biba_check_inpcb_deliver,
.mpo_check_sysv_msgrcv = mac_biba_check_sysv_msgrcv,
.mpo_check_sysv_msgrmid = mac_biba_check_sysv_msgrmid,
.mpo_check_sysv_msqget = mac_biba_check_sysv_msqget,
.mpo_check_sysv_msqsnd = mac_biba_check_sysv_msqsnd,
.mpo_check_sysv_msqrcv = mac_biba_check_sysv_msqrcv,
.mpo_check_sysv_msqctl = mac_biba_check_sysv_msqctl,
.mpo_check_sysv_semctl = mac_biba_check_sysv_semctl,
.mpo_check_sysv_semget = mac_biba_check_sysv_semget,
.mpo_check_sysv_semop = mac_biba_check_sysv_semop,
.mpo_check_sysv_shmat = mac_biba_check_sysv_shmat,
.mpo_check_sysv_shmctl = mac_biba_check_sysv_shmctl,
.mpo_check_sysv_shmget = mac_biba_check_sysv_shmget,
.mpo_check_kld_load = mac_biba_check_kld_load,
.mpo_check_mount_stat = mac_biba_check_mount_stat,
.mpo_check_pipe_ioctl = mac_biba_check_pipe_ioctl,
.mpo_check_pipe_poll = mac_biba_check_pipe_poll,
.mpo_check_pipe_read = mac_biba_check_pipe_read,
.mpo_check_pipe_relabel = mac_biba_check_pipe_relabel,
.mpo_check_pipe_stat = mac_biba_check_pipe_stat,
.mpo_check_pipe_write = mac_biba_check_pipe_write,
.mpo_check_posix_sem_destroy = mac_biba_check_posix_sem_write,
.mpo_check_posix_sem_getvalue = mac_biba_check_posix_sem_rdonly,
.mpo_check_posix_sem_open = mac_biba_check_posix_sem_write,
.mpo_check_posix_sem_post = mac_biba_check_posix_sem_write,
.mpo_check_posix_sem_unlink = mac_biba_check_posix_sem_write,
.mpo_check_posix_sem_wait = mac_biba_check_posix_sem_write,
.mpo_check_proc_debug = mac_biba_check_proc_debug,
.mpo_check_proc_sched = mac_biba_check_proc_sched,
.mpo_check_proc_signal = mac_biba_check_proc_signal,
.mpo_check_socket_deliver = mac_biba_check_socket_deliver,
.mpo_check_socket_relabel = mac_biba_check_socket_relabel,
.mpo_check_socket_visible = mac_biba_check_socket_visible,
.mpo_check_system_acct = mac_biba_check_system_acct,
.mpo_check_system_auditctl = mac_biba_check_system_auditctl,
.mpo_check_system_auditon = mac_biba_check_system_auditon,
.mpo_check_system_swapon = mac_biba_check_system_swapon,
.mpo_check_system_swapoff = mac_biba_check_system_swapoff,
.mpo_check_system_sysctl = mac_biba_check_system_sysctl,
.mpo_check_vnode_access = mac_biba_check_vnode_open,
.mpo_check_vnode_chdir = mac_biba_check_vnode_chdir,
.mpo_check_vnode_chroot = mac_biba_check_vnode_chroot,
.mpo_check_vnode_create = mac_biba_check_vnode_create,
.mpo_check_vnode_deleteacl = mac_biba_check_vnode_deleteacl,
.mpo_check_vnode_deleteextattr = mac_biba_check_vnode_deleteextattr,
.mpo_check_vnode_exec = mac_biba_check_vnode_exec,
.mpo_check_vnode_getacl = mac_biba_check_vnode_getacl,
.mpo_check_vnode_getextattr = mac_biba_check_vnode_getextattr,
.mpo_check_vnode_link = mac_biba_check_vnode_link,
.mpo_check_vnode_listextattr = mac_biba_check_vnode_listextattr,
.mpo_check_vnode_lookup = mac_biba_check_vnode_lookup,
.mpo_check_vnode_mmap = mac_biba_check_vnode_mmap,
.mpo_check_vnode_open = mac_biba_check_vnode_open,
.mpo_check_vnode_poll = mac_biba_check_vnode_poll,
.mpo_check_vnode_read = mac_biba_check_vnode_read,
.mpo_check_vnode_readdir = mac_biba_check_vnode_readdir,
.mpo_check_vnode_readlink = mac_biba_check_vnode_readlink,
.mpo_check_vnode_relabel = mac_biba_check_vnode_relabel,
.mpo_check_vnode_rename_from = mac_biba_check_vnode_rename_from,
.mpo_check_vnode_rename_to = mac_biba_check_vnode_rename_to,
.mpo_check_vnode_revoke = mac_biba_check_vnode_revoke,
.mpo_check_vnode_setacl = mac_biba_check_vnode_setacl,
.mpo_check_vnode_setextattr = mac_biba_check_vnode_setextattr,
.mpo_check_vnode_setflags = mac_biba_check_vnode_setflags,
.mpo_check_vnode_setmode = mac_biba_check_vnode_setmode,
.mpo_check_vnode_setowner = mac_biba_check_vnode_setowner,
.mpo_check_vnode_setutimes = mac_biba_check_vnode_setutimes,
.mpo_check_vnode_stat = mac_biba_check_vnode_stat,
.mpo_check_vnode_unlink = mac_biba_check_vnode_unlink,
.mpo_check_vnode_write = mac_biba_check_vnode_write,
.mpo_associate_nfsd_label = mac_biba_associate_nfsd_label,
.mpo_create_mbuf_from_firewall = mac_biba_create_mbuf_from_firewall,
.mpo_priv_check = mac_biba_priv_check,
};
MAC_POLICY_SET(&mac_biba_ops, mac_biba, "TrustedBSD MAC/Biba",
MPC_LOADTIME_FLAG_NOTLATE | MPC_LOADTIME_FLAG_LABELMBUFS, &mac_biba_slot);
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